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1
00:00:00,000 --> 00:00:03,440
>> [Daqq ta mużika]

2
00:00:03,440 --> 00:01:57,217

3
00:01:57,217 --> 00:02:00,710
>> [Applause]

4
00:02:00,710 --> 00:02:05,700

5
00:02:05,700 --> 00:02:09,669
>> DAVID J. Malan: Dan huwa CS50,
Introduzzjoni Harvard University

6
00:02:09,669 --> 00:02:12,370
għall-intellettwali
intrapriżi ta 'xjenza tal-kompjuter

7
00:02:12,370 --> 00:02:14,180
u l-arti ta 'programmazzjoni.

8
00:02:14,180 --> 00:02:17,530
Issa jekk inti fost dawk li
kull sena huma seduta hawn

9
00:02:17,530 --> 00:02:21,450
bi ftit ta 'nervituri fil-moħħ tiegħek, bħal
li inti ma taħseb li jagħmlu parti minn hawn,

10
00:02:21,450 --> 00:02:24,270
taħseb li l-aktar
ħadd seduta madwar inti

11
00:02:24,270 --> 00:02:27,730
jaf ferm aktar milli suppost, huwa tabilħaqq
aktar komda milli suppost fil-kompjuter

12
00:02:27,730 --> 00:02:30,430
xjenza jew kompjuters
b'mod aktar ġenerali, tirrealizza

13
00:02:30,430 --> 00:02:36,140
li 78% tal-istudenti li issa
tieħu CS50 ma jkollhom ebda esperjenza minn qabel.

14
00:02:36,140 --> 00:02:39,570
>> Tabilħaqq, hemm 100 dots hemm
dwar il-wiri, 78 minnhom

15
00:02:39,570 --> 00:02:43,540
huma ħodor solidi, li jfisser li inti,
jekk int fost dik demografika,

16
00:02:43,540 --> 00:02:46,420
huma fil-kumpanija tajba ħafna hawn fuq barra.

17
00:02:46,420 --> 00:02:50,320
U jekk inti minflok fost l-
22% ta 'studenti CS50 li jagħmlu tabilħaqq

18
00:02:50,320 --> 00:02:53,920
jkollhom esperjenza minn qabel, kemm jekk fil-
iskola għolja jew xi programm ieħor,

19
00:02:53,920 --> 00:02:56,430
tirrealizza li inti, wisq, se
jiġi kkontestat fil-kors.

20
00:02:56,430 --> 00:02:59,930
>> Mhux biss għandna binarji differenti
għall-istudenti anqas komdu u aktar

21
00:02:59,930 --> 00:03:03,789
komdu bl-istess mod fit-taqsimiet, aħna
wkoll l-hekk imsejħa edizzjonijiet Hacker

22
00:03:03,789 --> 00:03:06,080
tal-aktar problema settijiet li
se jisfida dawk l-istudenti

23
00:03:06,080 --> 00:03:09,650
ma 'dak esperjenza addizzjonali
biex jesploraw materjal simili

24
00:03:09,650 --> 00:03:12,140
iżda minn aktar
perspettiva sofistikati.

25
00:03:12,140 --> 00:03:13,900
>> Imma dak li huwa xjenza tal-kompjuter?

26
00:03:13,900 --> 00:03:17,750
Well, finalment, dak li għaddej biex
kwistjoni kif inti jesploraw il-qasam mhuwiex

27
00:03:17,750 --> 00:03:20,500
tant fejn inti tispiċċa
relattiva għall-klassi tiegħek,

28
00:03:20,500 --> 00:03:25,350
imma fejn inti yourself jispiċċaw fl
12 ġimgħa versus fejn inti tibda hawn

29
00:03:25,350 --> 00:03:26,720
fil żero ġimgħa.

30
00:03:26,720 --> 00:03:31,850
Issa kompjuter science-- sew, ejja
sejħa hija l-xjenza ta 'computation--

31
00:03:31,850 --> 00:03:35,910
fejn kompjutazzjoni hija verament ftit
mod fancy ta 'tgħid, jieħdu xi input,

32
00:03:35,910 --> 00:03:39,460
produzzjoni ta 'xi output, u
jagħmlu dan permezz ta 'algoritmi running,

33
00:03:39,460 --> 00:03:43,700
settijiet ta 'struzzjonijiet sabiex isolvi
xi problema fuq dawk l-inputs

34
00:03:43,700 --> 00:03:48,460
sabiex jipproduċu xi output jew
soluzzjoni li inti interessat.

35
00:03:48,460 --> 00:03:51,310
>> Allura aħna reċentement kellhom
okkażjoni biex jivvjaġġaw barra

36
00:03:51,310 --> 00:03:53,170
biex California biex jilħqu ma 'alumna.

37
00:03:53,170 --> 00:03:54,650
Isimha huwa Susan Wojcicki.

38
00:03:54,650 --> 00:03:57,190
U hi tixtieq li jitkellmu
lilek hawn fuq video

39
00:03:57,190 --> 00:04:01,690
li jixhdu li kemm applikabbli
anki biss togħma ta 'kompjuter

40
00:04:01,690 --> 00:04:03,770
xjenza fil-
livell introduttorja jista 'jkun.

41
00:04:03,770 --> 00:04:06,870
Anki jekk inti ma jmorrux fuq biex isegwu
xjenza tal-kompjuter bħala qasam,

42
00:04:06,870 --> 00:04:09,330
jew saħansitra inġinerija,
jew ZOKK b'mod aktar ġenerali,

43
00:04:09,330 --> 00:04:12,360
tkun taf tara, fil-fatt, kif ċertu
kors hekk influwenzati ħajja tagħha.

44
00:04:12,360 --> 00:04:16,630
U hi biss biss ħa meta hi
kien anzjan hawn fil-Harvard College.

45
00:04:16,630 --> 00:04:19,482
>> Jekk nistgħu dim-dwal għall Susan.

46
00:04:19,482 --> 00:04:20,690
SUSAN Wojcicki: Hello, dinja.

47
00:04:20,690 --> 00:04:22,100
Jien Susan Wojcicki.

48
00:04:22,100 --> 00:04:24,110
Jien il-CEO ta 'YouTube.

49
00:04:24,110 --> 00:04:29,150
And I ħa CS50 meta I kien
anzjan fil-Harvard fl-1990.

50
00:04:29,150 --> 00:04:31,220
I kien attwalment storja
u l-letteratura maġġuri.

51
00:04:31,220 --> 00:04:36,760
>> U fis-sajf junior tiegħi,
I induna li forsi I

52
00:04:36,760 --> 00:04:39,060
riedu jitgħallmu xi ħaġa
dwar il-kompjuters.

53
00:04:39,060 --> 00:04:40,930
U hekk, Wasalt lura.

54
00:04:40,930 --> 00:04:42,500
I ħa CS50.

55
00:04:42,500 --> 00:04:46,940
Kien diffiċli, iżda kienet il-
aktar klassi aqwa I ħa.

56
00:04:46,940 --> 00:04:49,630
>> Huwa biddel kif naħseb dwar kollox.

57
00:04:49,630 --> 00:04:55,810
U meta I gradwat minn Harvard
fl-1990, I marru għall Silicon Valley.

58
00:04:55,810 --> 00:04:57,140
U sibt xogħol.

59
00:04:57,140 --> 00:05:00,150
U stajt ilhom jaħdmu
fil tech qatt peress.

60
00:05:00,150 --> 00:05:02,650
DAVID J. Malan: Issa dak Susan
ma jsemmi f'dan il-video,

61
00:05:02,650 --> 00:05:05,340
li kien attwalment fil tagħha
garaxx li Google innifsu kien

62
00:05:05,340 --> 00:05:07,420
mwaqqfa mill Larry u Sergey.

63
00:05:07,420 --> 00:05:11,169
>> Issa aħna wkoll laħqu l-ħbieb tagħna
fi code.org, organizzazzjoni li

64
00:05:11,169 --> 00:05:13,460
matul l-aħħar sena kienet
jkollna nies partikolarment

65
00:05:13,460 --> 00:05:16,520
eċċitati dwar ix-xjenza tal-kompjuter
u l-programmazzjoni, b'mod partikolari.

66
00:05:16,520 --> 00:05:20,590
Iżda ta 'min jinnota li l-ipprogrammar
mhix xjenza tal-kompjuter per se.

67
00:05:20,590 --> 00:05:22,090
Xjenza tal-kompjuter mhuwiex programmazzjoni.

68
00:05:22,090 --> 00:05:24,560
Pjuttost ipprogrammar huwa biss
tool-- magħhom kollha inti

69
00:05:24,560 --> 00:05:27,510
se jkunu kollha wisq ukoll
familjari billi end-- semestru tal

70
00:05:27,510 --> 00:05:30,650
tali li inti tista 'tapplika ma
biss għall-korsijiet futuri fil CS

71
00:05:30,650 --> 00:05:33,670
imma biex kwalunkwe oqsma minn minn fejn
int ġejjin, fl-istudji umanistiċi,

72
00:05:33,670 --> 00:05:36,090
xjenzi soċjali, naturali
xjenza, jew simili.

73
00:05:36,090 --> 00:05:39,740
>> Tabilħaqq, jippermettu oħra ftit
alumni u l-kollegi tagħhom

74
00:05:39,740 --> 00:05:43,400
li jkellem lill-applikabbiltà
tal-qasam li jistenna.

75
00:05:43,400 --> 00:05:52,340

76
00:05:52,340 --> 00:05:57,350
>> Bill Gates: I kien 13 meta I
ewwel ltqajna aċċess għall-kompjuter.

77
00:05:57,350 --> 00:06:00,485
>> JACK DORSEY: My ġenituri
mixtrija me a Macintosh fl-1984

78
00:06:00,485 --> 00:06:01,640
meta I kien tmien-il sena qodma.

79
00:06:01,640 --> 00:06:02,990
>> MARKA Zuckerberg: I ​​kien
fis-sitt grad.

80
00:06:02,990 --> 00:06:04,670
>> SPEAKER 1: tgħallimt għall-kodiċi fil-kulleġġ.

81
00:06:04,670 --> 00:06:09,080
>> RUCHI SANGHVI: sena Freshman, l-ewwel
semestru, Intro biex Computer Science.

82
00:06:09,080 --> 00:06:11,850
>> Bill Gates: I kiteb programm
li lagħbu tic tac toe.

83
00:06:11,850 --> 00:06:14,100
>> DREW HOUSTON: Naħseb li kien
bidu pretty umli.

84
00:06:14,100 --> 00:06:16,370
Naħseb li l-ewwel programm
I kiteb talab affarijiet simili,

85
00:06:16,370 --> 00:06:17,820
x'hemm kulur favorit tiegħek?

86
00:06:17,820 --> 00:06:18,696
Jew kemm qodma int?

87
00:06:18,696 --> 00:06:21,070
ELENA SILENOK: I-ewwel tgħallmu
kif jagħmlu ċirku aħdar

88
00:06:21,070 --> 00:06:23,670
u kwadru aħmar jidhru fuq l-iskrin.

89
00:06:23,670 --> 00:06:25,420
Gabe Newell: L-ewwel
time I attwalment kellu

90
00:06:25,420 --> 00:06:27,360
xi ħaġa toħroġ u jgħidu, hello, dinja.

91
00:06:27,360 --> 00:06:29,710
U jien għamel kompjuter tagħmel dan.

92
00:06:29,710 --> 00:06:30,850
Kien biss zaskakuje.

93
00:06:30,850 --> 00:06:33,224
>> MARKA Zuckerberg: Titgħallem kif
għall-programm ma tibda off

94
00:06:33,224 --> 00:06:35,450
bħala li jixtiequ jitgħallmu
kollha ta 'xjenza tal-kompjuter

95
00:06:35,450 --> 00:06:38,630
jew li jippruvaw kaptan dan
dixxiplina jew xi ħaġa bħal dik.

96
00:06:38,630 --> 00:06:41,591
Hija biss beda off minħabba I
riedu jagħmlu dan ħaġa waħda sempliċi.

97
00:06:41,591 --> 00:06:44,340
I riedu jagħmlu xi ħaġa li
kien gost għalija nnifsi u aħwa tiegħi.

98
00:06:44,340 --> 00:06:46,399
>> U jien kiteb dan il-programm ftit.

99
00:06:46,399 --> 00:06:48,440
U mbagħad bażikament biss
miżjud ftit lilha.

100
00:06:48,440 --> 00:06:49,930
U mbagħad meta I meħtieġa
biex jitgħallmu xi ħaġa ġdida,

101
00:06:49,930 --> 00:06:52,210
Fittixt it up, jew fil
ktieb jew fuq l-internet,

102
00:06:52,210 --> 00:06:53,240
u mbagħad miżjud ftit lilha.

103
00:06:53,240 --> 00:06:56,300
>> DREW HOUSTON: Huwa verament ma b'differenza
daqq ta 'strument jew xi ħaġa

104
00:06:56,300 --> 00:07:00,007
jew playing sport.

105
00:07:00,007 --> 00:07:01,090
DAVID J. Malan: Kull dritt.

106
00:07:01,090 --> 00:07:04,120
Allura ejjew issa attwalment
adsa ftit aktar profonda.

107
00:07:04,120 --> 00:07:07,430
Liema huma dawn l-inputs u l-outputs
li aħna qed jitkellem dwar hawn?

108
00:07:07,430 --> 00:07:09,110
>> Allura kif madwar xi ħaġa sempliċi?

109
00:07:09,110 --> 00:07:12,120
You know probabbilment, anke jekk ikollok
ebda familjarità ma 'xjenza tal-kompjuter

110
00:07:12,120 --> 00:07:16,570
tkun xi tkun, li l-kompjuters jużaw b'xi mod
u jifhem biss żerijiet u dawk.

111
00:07:16,570 --> 00:07:20,500
Imma kif jista 'dan possibilment tingħata kif
desktops ħafna tal-lum u laptops simili

112
00:07:20,500 --> 00:07:21,280
tista 'tagħmel?

113
00:07:21,280 --> 00:07:24,310
>> Il DNA tal-ġurnata, l-unika
alfabett li huma jifhmu

114
00:07:24,310 --> 00:07:26,410
huwa żero jew wieħed.

115
00:07:26,410 --> 00:07:27,470
Ukoll, jikkunsidraw dan.

116
00:07:27,470 --> 00:07:30,840
Aħna, bnedmin, għandhom tendenza li jużaw l-
sistema deċimali. "Diċembru" jfisser 10.

117
00:07:30,840 --> 00:07:33,970
U li 10 għaliex għandna
10 numri, 0 permezz disgħa.

118
00:07:33,970 --> 00:07:36,180
>> Issa kompjuters, b'kuntrast,
għandhom tendenza li jużaw binarja.

119
00:07:36,180 --> 00:07:37,270
"Bi" jfisser żewġ.

120
00:07:37,270 --> 00:07:39,560
Allura dawn għandhom tendenza li jużaw biss żero u wieħed.

121
00:07:39,560 --> 00:07:42,680
Iżda jirriżulta, li anke
biss ma 'żerijiet u dawk, li

122
00:07:42,680 --> 00:07:45,900
huwa alfabett kbira biżżejjed
li biex jirrappreżentaw l-aktar

123
00:07:45,900 --> 00:07:48,490
kull biċċa ta 'data li trid,
jekk huwa numru,

124
00:07:48,490 --> 00:07:52,100
jekk huwa ittra, jekk huwa
grafika jew video fuq l-iskrin.

125
00:07:52,100 --> 00:07:57,140
>> Ikkunsidra, per eżempju, kif aħna bnedmin
tipikament jinterpretaw dan in-numru hawnhekk.

126
00:07:57,140 --> 00:08:00,010
Dan huwa biss tlieta
ċifri, wieħed, tnejn, tlieta.

127
00:08:00,010 --> 00:08:04,570
Imma nafu dan in-numru
innately issa bħala 123.

128
00:08:04,570 --> 00:08:05,510
Iżda għaliex huwa li?

129
00:08:05,510 --> 00:08:07,570
>> Ukoll, jekk taħseb lura
biex forsi l-iskola grad,

130
00:08:07,570 --> 00:08:11,700
inti probabilment ġew mgħallma biex jaħsbu ta '
dawn in-numri bħala li jkunu kolonni,

131
00:08:11,700 --> 00:08:14,700
fejn il-wieħed huwa fil-mijiet
post, it-tnejn huwa fil-post għexieren,

132
00:08:14,700 --> 00:08:16,360
u t-tliet huwa fil-dawk post.

133
00:08:16,360 --> 00:08:17,790
Għaliex huwa li attwalment utli?

134
00:08:17,790 --> 00:08:19,665
Well, jaħsbu dwar il-
aritmetika sempliċi super

135
00:08:19,665 --> 00:08:22,219
li aħna kollha kienu
tagħmel għas-snin issa.

136
00:08:22,219 --> 00:08:24,510
Effettivament, jekk inti ħadthom ltqajna
waħda fil-post mijiet,

137
00:08:24,510 --> 00:08:29,610
inti tagħmel l-matematika quick 100
darbiet 1 plus 10 darbiet 2--

138
00:08:29,610 --> 00:08:33,059
għaliex tnejn huwa fl-għexieren
place-- plus 1 żminijiet 3--

139
00:08:33,059 --> 00:08:34,830
minħabba tlieta huwa fil-dawk post.

140
00:08:34,830 --> 00:08:37,039
Allura, naturalment, jekk aħna
attwalment immoltiplika dan out,

141
00:08:37,039 --> 00:08:39,600
dak li aħna qed verament jirrappreżentaw
ma 'dan wieħed pattern--

142
00:08:39,600 --> 00:08:46,150
tnejn three-- huwa 100 plus 20 plus
3, li, naturalment, huwa 123.

143
00:08:46,150 --> 00:08:51,130
>> Issa binarju, u kompjuters verament,
fundamentalment jitkellmu l-istess lingwa

144
00:08:51,130 --> 00:08:51,680
li nagħmlu.

145
00:08:51,680 --> 00:08:53,400
Huma biss ikollhom alfabett iżgħar.

146
00:08:53,400 --> 00:08:57,100
Allura kompjuters biss ikollhom żerijiet
u dawk għad-dispożizzjoni tagħhom.

147
00:08:57,100 --> 00:09:02,500
Allura billi aħna bnedmin għandhom essenzjalment
setgħat ta '10 f'kull wieħed minn dawn places--

148
00:09:02,500 --> 00:09:06,810
10 għall-żero, 10 għall-waħda, għaxra
biex it-tnejn, giving you 110 u 100

149
00:09:06,810 --> 00:09:07,700
rispettivament.

150
00:09:07,700 --> 00:09:12,140
>> Minħabba kompjuters biss għandhom żewġ valuri
huma jistgħu jifhmu, żero u wieħed,

151
00:09:12,140 --> 00:09:16,600
huma għandhom jużaw valuri differenti
f'dawn il-kolonni, waħda, tnejn, erbgħa.

152
00:09:16,600 --> 00:09:20,480
U jekk aħna jinżammu għaddejjin, tmienja,
16, 32, 64, u ibqa 'sejjer hekk.

153
00:09:20,480 --> 00:09:24,220
Iżda l-mudell u l-
mentalità huwa eżattament l-istess.

154
00:09:24,220 --> 00:09:27,340
>> Allura billi din il-loġika, xi ħadd, kif se
I tmur dwar tirrappreżenta n-numru

155
00:09:27,340 --> 00:09:28,530
wieħed binarju?

156
00:09:28,530 --> 00:09:33,080
Jekk inti stajt qatt ħsibt anke dwar
dan qabel, x'hemm imsaren tiegħek jgħidu?

157
00:09:33,080 --> 00:09:33,777
>> UDJENZA: One.

158
00:09:33,777 --> 00:09:34,610
DAVID J. Malan: One.

159
00:09:34,610 --> 00:09:35,660
Eżattament.

160
00:09:35,660 --> 00:09:38,100
Aħna biss bżonn ta 'wieħed fil-
dawk post minħabba l-żerijiet

161
00:09:38,100 --> 00:09:40,610
biżżejjed biex tagħtina
la ta 'erba lanqas tnejn.

162
00:09:40,610 --> 00:09:42,440
Allura wieħed ħinijiet wieħed ugwali wieħed.

163
00:09:42,440 --> 00:09:43,940
Issa l-affarijiet jiksbu ftit interessanti.

164
00:09:43,940 --> 00:09:46,830
Jekk irrid jirrappreżentaw fil
Binarju-numru two-- iżda,

165
00:09:46,830 --> 00:09:49,790
darb'oħra, anki jekk inti stajt qatt
mitkellma din il-lingwa qabel,

166
00:09:49,790 --> 00:09:54,680
kif do we jirrappreżentaw fil binarja
l-valur aħna bnedmin magħrufa bħala tnejn?

167
00:09:54,680 --> 00:09:55,570
Zero wieħed zero.

168
00:09:55,570 --> 00:09:57,620
Just tpoġġi l-wieħed fil-
kolonna li inti jriduhom.

169
00:09:57,620 --> 00:09:59,560
>> Issa huwa jkollna pretty
faċli probabbilment issa.

170
00:09:59,560 --> 00:10:02,950
Mela jekk jien tixtieq li jirrappreżentaw three--
m'hemm kolonna ebda tlieta tal.

171
00:10:02,950 --> 00:10:06,770
Għalhekk, għal darb'oħra, I jistgħu issa jżidu dawn il-valuri
flimkien mill-tqegħid waħda hawn.

172
00:10:06,770 --> 00:10:10,320
Allura 2 darbiet 1 plus 1
ħinijiet 1 huwa, ovvjament, 3.

173
00:10:10,320 --> 00:10:13,480
>> Issa l-affarijiet jiksbu ftit gost fil
li dawk issa saru żerijiet.

174
00:10:13,480 --> 00:10:15,480
U biex jirrappreżentaw erba, I nikseb dan.

175
00:10:15,480 --> 00:10:19,310
U jekk aħna inkrement bil-mod
here-- li jkun ħamsa.

176
00:10:19,310 --> 00:10:20,700
Dan ikun sitta.

177
00:10:20,700 --> 00:10:22,100
Dan ikun sebgħa.

178
00:10:22,100 --> 00:10:25,310
>> Imma issa I jidhru li jkollhom
run fis-problema.

179
00:10:25,310 --> 00:10:30,520
Kif jista I tmur dwar jirrappreżentaw
eight-- tkun il-valur li jmiss.

180
00:10:30,520 --> 00:10:31,900
Yeah, għalhekk għandna bżonn bits ġodda.

181
00:10:31,900 --> 00:10:33,899
U, tabilħaqq, jekk inti stajt
jinstemgħu din il-frażi qabel,

182
00:10:33,899 --> 00:10:37,380
bits, li jinsab biss qasir għal
ċifri binarju, żero jew wieħed.

183
00:10:37,380 --> 00:10:41,520
>> U so I jiġri li jkun jirrappreżenta
biss tliet bits dawn hawn.

184
00:10:41,520 --> 00:10:44,900
Imma kieku kelli mod ta 'ħażna ma
tliet bits differenti, iżda erba,

185
00:10:44,900 --> 00:10:47,250
żgur I jista 'jirrappreżenta
tmienja, u mbagħad disa, u mbagħad

186
00:10:47,250 --> 00:10:49,400
10, u saħansitra ogħla u ogħla.

187
00:10:49,400 --> 00:10:52,140
>> Iżda dan mbagħad jitlob
in kwistjoni kif nistgħu

188
00:10:52,140 --> 00:10:54,540
go dwar jirrappreżentaw dawn
affarijiet fl-ewwel post.

189
00:10:54,540 --> 00:10:56,950
Hija ħaġa waħda li tiġbed
minnhom up here fuq slide,

190
00:10:56,950 --> 00:11:00,660
imma kif taħseb li jirrappreżentawhom
jekk int apparat mekkaniku?

191
00:11:00,660 --> 00:11:04,390
X'inhu kompjuter jagħmlu biex
jirrappreżentaw l-inputs u l-outputs li

192
00:11:04,390 --> 00:11:09,020
fundamentalment jiddefinixxu komputazzjoni
fl-aħħar tal-ġurnata?

193
00:11:09,020 --> 00:11:12,090
>> Ukoll, dak dwar xi ħaġa
super sempliċi bħal din?

194
00:11:12,090 --> 00:11:13,200
Huwa biss bozza tad-dawl.

195
00:11:13,200 --> 00:11:15,460
U nista jikkawżaw dan
bozza tad-dawl li jmorru fuq

196
00:11:15,460 --> 00:11:17,920
billi ddawwar xi elettriku
fuq u li jippermettu elettroni

197
00:11:17,920 --> 00:11:22,585
għall-fluss permezz, li tbiddel tagħha
istat jew il-valur tagħha, biex ngħidu hekk.

198
00:11:22,585 --> 00:11:24,460
Per eżempju, dan huwa
lampa desk iskola antika

199
00:11:24,460 --> 00:11:27,250
hawn ma 'wieħed bħal
bozza tad-dawl ġewwa ta 'dan.

200
00:11:27,250 --> 00:11:29,940
U d-dritt issa huwa mhux
verament tagħmel xejn utli.

201
00:11:29,940 --> 00:11:32,680
Imma malli I plagg
fis socket elettriku

202
00:11:32,680 --> 00:11:36,390
u mbagħad jużaw dan switch-- jew
nistgħu anke sejħa hija transistor

203
00:11:36,390 --> 00:11:39,970
jew jaħsbu bħala such--
I issa jistgħu jirrappreżentaw jew

204
00:11:39,970 --> 00:11:44,120
dan il-valur, fejn l-bozza tad-dawl
ovvjament off, jew dan il-valur.

205
00:11:44,120 --> 00:11:46,060
Dan il-valur jew il dan il-valur.

206
00:11:46,060 --> 00:11:47,520
Dan il-valur u oħrajn.

207
00:11:47,520 --> 00:11:51,220
>> Allura ġewwa ta 'kompjuter, preżumibbilment,
huma biċċiet ħafna iżgħar ta 'hardware,

208
00:11:51,220 --> 00:11:52,970
iżda li fl-aħħar
tal-ġurnata sempliċiment għandek

209
00:11:52,970 --> 00:11:55,360
għall-użu electricity--
forsi jaqbdu it--

210
00:11:55,360 --> 00:11:59,730
u mbagħad jew iżommu xi ħaġa
fuq jew iżommu xi ħaġa off.

211
00:11:59,730 --> 00:12:02,021
Of course, dan mhuwiex
partikolarment interessanti li tagħmel

212
00:12:02,021 --> 00:12:03,270
biss bi bozza tad-dawl wieħed.

213
00:12:03,270 --> 00:12:06,726
>> Fil-fatt, kif għolja tista I joqgħod fil
binarja ma 'dan il-fanal desk hawn?

214
00:12:06,726 --> 00:12:07,420
>> UDJENZA: One.

215
00:12:07,420 --> 00:12:08,545
>> DAVID J. Malan: One, id-dritt?

216
00:12:08,545 --> 00:12:11,020
I bżonn aktar lampi desk jekk I
fil-fatt tixtieq li jgħoddu ogħla.

217
00:12:11,020 --> 00:12:12,210
Iżda nistgħu nagħmlu aħjar minn dik.

218
00:12:12,210 --> 00:12:14,460
Minħabba li l-bozoz tad-dawl li
konna jitqiegħdu fil dawn l-affarijiet

219
00:12:14,460 --> 00:12:17,730
huma bozoz tad-dawl fil-fatt fancier
milli imgħoddi jippermetti.

220
00:12:17,730 --> 00:12:20,310
U dawn qed attwalment
bozoz tad-dawl f'netwerk.

221
00:12:20,310 --> 00:12:23,160
U għenieqed ta 'kumpaniji
tagħmel dawn l-affarijiet dawn il-jiem.

222
00:12:23,160 --> 00:12:25,190
>> Iżda jirriżulta li
dan wieħed b'mod partikolari

223
00:12:25,190 --> 00:12:27,680
tiġi flimkien ma 'li biha karatteristika
tista 'tbiddel kuluri tiegħu.

224
00:12:27,680 --> 00:12:30,810
Allura per eżempju, jekk inti
adorned kamra dorm tiegħek

225
00:12:30,810 --> 00:12:33,200
bi ftit ta 'dawn dawl
basal, jiddependi fuq il-burdata tiegħek,

226
00:12:33,200 --> 00:12:35,366
jiddependi fuq li tidħol fi,
jiddependi fuq it-temp,

227
00:12:35,366 --> 00:12:37,360
jiddependi fuq il-ħin
tal-ġurnata, inti tista 'attwalment

228
00:12:37,360 --> 00:12:40,300
Tibdilx il-kuluri tal-
il-basal fil-kamra tiegħek.

229
00:12:40,300 --> 00:12:43,740
U dan għaliex dawn dawl
basal u ohrajn bhalu jkollhom x'hemm

230
00:12:43,740 --> 00:12:48,010
imsejħa API, applikazzjoni
interface programmazzjoni, li

231
00:12:48,010 --> 00:12:50,920
huwa suġġett li magħhom inti ser tkun ukoll
familjari mal sa tmiem semestru tal.

232
00:12:50,920 --> 00:12:53,710
>> U dan huwa biss fancy,
mod mistur ta 'tgħid,

233
00:12:53,710 --> 00:12:57,570
inti tista 'programm dawn dawl
basal li jagħmlu offerti tiegħek.

234
00:12:57,570 --> 00:13:00,360
Inti tista 'tibgħathom messaġġi
bħad inti, bniedem,

235
00:13:00,360 --> 00:13:03,640
tista 'tibgħat messaġġ lil web server
qal, agħti lili aħbarijiet tal-lum

236
00:13:03,640 --> 00:13:05,110
jew jagħtu me email tiegħi.

237
00:13:05,110 --> 00:13:08,010
>> Tista 'tibgħat aktar arcane
messaġġi għal dawn bozoz tad-dawl

238
00:13:08,010 --> 00:13:09,700
li jgħidu, dawwar fuq u itfi.

239
00:13:09,700 --> 00:13:11,370
Imma dak li mhux kollha li interessanti.

240
00:13:11,370 --> 00:13:14,280
Tista 'tgħid, jduru fuq aħmar,
jduru fuq aħdar, imbagħad fuq blu,

241
00:13:14,280 --> 00:13:15,990
kollha bl-istess bozza tad-dawl.

242
00:13:15,990 --> 00:13:20,990
U inti tista 'anki, bi ftit aktar
sofistikati, jgħidu, dawwar lilek innifsek għal ikħal

243
00:13:20,990 --> 00:13:24,710
meta huwa jum gloomy
barra, per eżempju.

244
00:13:24,710 --> 00:13:27,910
Hija tista 'attwalment garża fis
API temp u nsib

245
00:13:27,910 --> 00:13:32,260
dak l-temp huwa, jew iż-żmien
tal-ġurnata, jew jqajjem oħra bħal dawn.

246
00:13:32,260 --> 00:13:35,550
>> Allura, fil-fatt, tnejn mill
Membri tal-persunal stess CS50'S,

247
00:13:35,550 --> 00:13:38,827
Dan Bradley u Ansel
Duff hawn, ġentilment akkwistati

248
00:13:38,827 --> 00:13:40,410
us mazz sħiħ ta 'dawn bozoz tad-dawl.

249
00:13:40,410 --> 00:13:42,910
U huma mibnija l CS50
ewwel basal qatt binarja,

250
00:13:42,910 --> 00:13:46,850
fejn konna rappreżentati here--
ma 'dawn magnets-- ftit jilgħab

251
00:13:46,850 --> 00:13:49,780
l-placeholders varji aħna
allużjoni għall biss daqsxejn ilu.

252
00:13:49,780 --> 00:13:52,572
>> Allura mod fuq hawnhekk huwa l-
dawk il-post, tnejn, erbgħa.

253
00:13:52,572 --> 00:13:54,030
U aħna ma tara ogħla minn dak.

254
00:13:54,030 --> 00:13:55,613
Imma, naturalment, dawn qed setgħat ta 'tnejn.

255
00:13:55,613 --> 00:13:59,490
Tmien, 16, 32, 64, u 128.

256
00:13:59,490 --> 00:14:03,320
Mela jekk jien issa tixtieq li jkun ftit fancier
milli jużaw dan is-swiċċ iskola antika,

257
00:14:03,320 --> 00:14:07,310
Għandi hawn fuq dan iPad
interface sempliċi super

258
00:14:07,310 --> 00:14:10,440
li Dan Bradley, ex
student u issa tagħlim sħabi,

259
00:14:10,440 --> 00:14:13,510
programed jużaw xi HTML
u JavaScript, li

260
00:14:13,510 --> 00:14:15,685
huma markup u l-programmazzjoni
lingwi rispettivament.

261
00:14:15,685 --> 00:14:17,560
U inti tista 'probabbilment
see-- anki fil-back--

262
00:14:17,560 --> 00:14:21,670
hemm big plus u minus big,
plus wieħed buttuna għal kull wieħed minn dawn il-basal.

263
00:14:21,670 --> 00:14:25,740
U dak li dan se ippermettuli
do hija, per eżempju, ikklikkja l-plus

264
00:14:25,740 --> 00:14:28,250
u issa jirrappreżentaw, ta
Naturalment, liema numru?

265
00:14:28,250 --> 00:14:28,750
Wieħed.

266
00:14:28,750 --> 00:14:30,220
U nista 'hit darb'oħra.

267
00:14:30,220 --> 00:14:31,480
Żewġ.

268
00:14:31,480 --> 00:14:32,800
Tliet.

269
00:14:32,800 --> 00:14:33,950
Erba.

270
00:14:33,950 --> 00:14:35,200
Ta 'ħames.

271
00:14:35,200 --> 00:14:36,360
Sitta.

272
00:14:36,360 --> 00:14:36,880
Seba.

273
00:14:36,880 --> 00:14:40,740
>> U hawn issa aħna nikseb li qlib,
iżda aħna għandna r-raba 'daqsxejn dan iż-żmien,

274
00:14:40,740 --> 00:14:42,180
hekk issa għandna tmien.

275
00:14:42,180 --> 00:14:44,000
Allura aħna tista 'tagħmel dan għal żmien pjuttost twil.

276
00:14:44,000 --> 00:14:46,530
Fil-fatt, bħala twarrib,
kif għoli nistgħu għadd?

277
00:14:46,530 --> 00:14:48,318
Kulħadd?

278
00:14:48,318 --> 00:14:49,270
>> UDJENZA: 255.

279
00:14:49,270 --> 00:14:51,420
>> DAVID J. Malan: 255, id-dritt?

280
00:14:51,420 --> 00:14:54,900
Tinkwetax wisq dwar il-matematika għall-
issa, iżda li numru pretty deċenti.

281
00:14:54,900 --> 00:14:59,140
Iżda fil-fatt ma marbut biss
kif ħafna biċċiet ta 'informazzjoni,

282
00:14:59,140 --> 00:15:01,760
bħal ittra, jew grafika
li nistgħu jirrappreżentaw.

283
00:15:01,760 --> 00:15:02,697
>> Imma l-ebda kwistjoni għal issa.

284
00:15:02,697 --> 00:15:04,530
Jien ser jimxi 'l quddiem
u jibdluhom kollha off.

285
00:15:04,530 --> 00:15:09,670
U jekk I jistgħu, nixtieq li jistaqsu għal
voluntier, l-ewwel volunteer-- tagħna

286
00:15:09,670 --> 00:15:11,342
oh, hello-- fuq il-palk.

287
00:15:11,342 --> 00:15:14,050
Il-qabda hija li inti għandek tkun
komdu jidhru, kif inti ċar

288
00:15:14,050 --> 00:15:17,421
huma fuq quddiem tal-klassi kollha tiegħek,
kif ukoll fuq l-internet.

289
00:15:17,421 --> 00:15:20,420
U let me tfittex ftit lil hinn the--
kif madwar hawn fil-shirt bajda?

290
00:15:20,420 --> 00:15:20,920
U l-idejn up.

291
00:15:20,920 --> 00:15:22,071
Come fuq up.

292
00:15:22,071 --> 00:15:22,820
X'inhu l-isem tiegħek?

293
00:15:22,820 --> 00:15:23,760
>> UDJENZA: Jackie.

294
00:15:23,760 --> 00:15:24,718
>> DAVID J. Malan: Jackie.

295
00:15:24,718 --> 00:15:25,820
Jackie, come fuq up.

296
00:15:25,820 --> 00:15:29,820
Allura dak li hemm ukoll fuq dan
iPad huwa buttuna imsejjaħ Game Mode.

297
00:15:29,820 --> 00:15:32,570
U dan Game Mode huwa
ser ippermettuli input

298
00:15:32,570 --> 00:15:35,780
bil-quddiem ta 'informazzjoni partikolari
numru, in-numri aħna bnedmin huma

299
00:15:35,780 --> 00:15:36,760
familjari magħhom.

300
00:15:36,760 --> 00:15:39,820
U allura inti ser jiġu kkontestati
hawn biex tuża l-buttuni

301
00:15:39,820 --> 00:15:42,140
fuq il-wieħed top-- għall
kull wieħed minn dawn bulbs--

302
00:15:42,140 --> 00:15:45,050
li attwalment insemmu
l-mudell ta 'bozoz tad-dawl

303
00:15:45,050 --> 00:15:46,970
li jirrappreżenta n-numru in kwistjoni.

304
00:15:46,970 --> 00:15:47,790
>> U jien sorry, dak li kien l-isem tiegħek mill-ġdid?

305
00:15:47,790 --> 00:15:48,250
>> UDJENZA: Jackie.

306
00:15:48,250 --> 00:15:48,620
>> DAVID J. Malan: Jackie.

307
00:15:48,620 --> 00:15:48,920
Kull dritt.

308
00:15:48,920 --> 00:15:49,740
Tajjeb li jissodisfaw inti.

309
00:15:49,740 --> 00:15:54,580
>> So let me go quddiem u programm
għad-dinja biex tara d-numru 15.

310
00:15:54,580 --> 00:15:56,360
Aħna ser jżommha żgħir fl-ewwel hawn.

311
00:15:56,360 --> 00:15:58,240
U jien se jmorru fil Game Mode.

312
00:15:58,240 --> 00:16:01,160
U jien ser jispeċifikaw,
tagħtina l-numru 15.

313
00:16:01,160 --> 00:16:01,900
>> OK.

314
00:16:01,900 --> 00:16:05,510
U issa ma 'kulħadd watching-- jekk
inti tixtieq li forsi toqgħod b'dan il-mod,

315
00:16:05,510 --> 00:16:09,970
minħabba li se line up-- jimxi 'l quddiem u
toggle-tmien buttuni tul il-quċċata

316
00:16:09,970 --> 00:16:12,530
biex inbiddlu l-basal fuq
jew off kif tara xieraq.

317
00:16:12,530 --> 00:16:13,530
>> UDJENZA: OK.

318
00:16:13,530 --> 00:16:17,720
>> DAVID J. Malan: U l-ebda qerq
billi jolqot plus 15 darbiet.

319
00:16:17,720 --> 00:16:19,275
Oh, aħna se tagħmel dan.

320
00:16:19,275 --> 00:16:20,069
>> UDJENZA: Oh, stenna.

321
00:16:20,069 --> 00:16:20,610
Jien hekk sorry.

322
00:16:20,610 --> 00:16:22,660
>> DAVID J. Malan: Tista 'wkoll dawran
l-bozoz tad-dawl fuq individwalment

323
00:16:22,660 --> 00:16:24,076
ma kull wieħed minn dawn buttuni fuq nett.

324
00:16:24,076 --> 00:16:24,844
UDJENZA: Oh, OK.

325
00:16:24,844 --> 00:16:27,429
Għalhekk ikun like--

326
00:16:27,429 --> 00:16:28,220
DAVID J. Malan: OK.

327
00:16:28,220 --> 00:16:29,100
Allura issa għandna tmien.

328
00:16:29,100 --> 00:16:31,280
Mela ejja nieqaf għall-
udjenza li jidħlu hawn.

329
00:16:31,280 --> 00:16:34,300
Dak in-numru huwa Jackie
li bħalissa jirrappreżentaw?

330
00:16:34,300 --> 00:16:34,800
11.

331
00:16:34,800 --> 00:16:35,730
Allura aħna qed kważi hemm.

332
00:16:35,730 --> 00:16:38,360

333
00:16:38,360 --> 00:16:39,630
U eċċellenti.

334
00:16:39,630 --> 00:16:41,487
Allura aħna għandna l-ewwel rebbieħ tagħna.

335
00:16:41,487 --> 00:16:42,445
Prosit.

336
00:16:42,445 --> 00:16:48,200
>> U ħsibna aħna'd jkollhom
xi jingħataw b'xejn fabulous.

337
00:16:48,200 --> 00:16:50,860
Jekk inti tixtieq li jkun wieħed tali
dorm kamra hawn fuq il-kampus,

338
00:16:50,860 --> 00:16:56,126
inti tista yourself għandek proġett finali
jużaw issa dan API, grazzi għall Jackie.

339
00:16:56,126 --> 00:16:57,050
Allura now--

340
00:16:57,050 --> 00:16:58,902
>> [Applause]

341
00:16:58,902 --> 00:17:01,690

342
00:17:01,690 --> 00:17:04,839
>> --if nistgħu, wieħed aktar
bħal madwar ta 'dan.

343
00:17:04,839 --> 00:17:07,690
Oh, issa kulħadd jixtieq xi bozoz tad-dawl.

344
00:17:07,690 --> 00:17:11,790
Għall-hekk imsejħa edizzjoni Hacker,
aħna qed tmur biex jirranka it up a-- oh,

345
00:17:11,790 --> 00:17:12,770
yeah, ma tikkommettix ruħha.

346
00:17:12,770 --> 00:17:16,010
I think int ġejjin up issa
jekk idek għaddej isfel.

347
00:17:16,010 --> 00:17:16,800
X'inhu l-isem tiegħek?

348
00:17:16,800 --> 00:17:17,424
>> UDJENZA: Alex.

349
00:17:17,424 --> 00:17:19,440
DAVID J. Malan: Alex, come fuq matul hawn.

350
00:17:19,440 --> 00:17:26,190
Allura għal Alex, aħna ser
programm f'għadd ftit akbar.

351
00:17:26,190 --> 00:17:27,790
Forsi fl-ordni.

352
00:17:27,790 --> 00:17:29,110
In-numru 50.

353
00:17:29,110 --> 00:17:29,744
>> UDJENZA: OK.

354
00:17:29,744 --> 00:17:31,660
DAVID J. Malan: Iżda, kif
I said-- u inti tista '

355
00:17:31,660 --> 00:17:33,580
tixtieq li toqgħod hawn hekk
li l-buttuni linja up

356
00:17:33,580 --> 00:17:37,115
kif inti expect-- imma jien ma
sejħa dan il-Hacker edizzjoni.

357
00:17:37,115 --> 00:17:47,125
Xorti tajba So--!

358
00:17:47,125 --> 00:17:48,416
>> [Rires]

359
00:17:48,416 --> 00:17:58,570

360
00:17:58,570 --> 00:18:02,050
>> Inti se tkun kapaċi li jduru
lilhom off jekk you-- OK.

361
00:18:02,050 --> 00:18:02,880
Eċċellenti.

362
00:18:02,880 --> 00:18:03,675
Wonderful.

363
00:18:03,675 --> 00:18:04,341
Prosit.

364
00:18:04,341 --> 00:18:08,730
>> [Applause]

365
00:18:08,730 --> 00:18:10,355
I suppose I għandhom iħallsu up.

366
00:18:10,355 --> 00:18:11,830
Prosit lil Alex ukoll.

367
00:18:11,830 --> 00:18:12,330
OK.

368
00:18:12,330 --> 00:18:15,550
>> Allura l-takeaway aħħari
hawnhekk huwa wieħed jittama, franchement,

369
00:18:15,550 --> 00:18:18,109
l simplicity-- l
sempliċità magħhom

370
00:18:18,109 --> 00:18:20,650
inti tista 'tikseb xi dawl sbieħ
basal, apparentament [inaudible].

371
00:18:20,650 --> 00:18:23,000
Iżda huma jirrappreżentaw,
finalment, l-istess ideat

372
00:18:23,000 --> 00:18:26,310
li magħhom aħna bnedmin huma
diġà wisq familjari.

373
00:18:26,310 --> 00:18:28,660
Allura dak li jista 'l-jmiss
pass 'jkun fil-progressjoni

374
00:18:28,660 --> 00:18:30,920
ta 'tipprova tagħmel xi ħaġa
interessanti ma 'data

375
00:18:30,920 --> 00:18:34,950
u li jirrappreżentaw inputs li huma mhux biss
numri iżda huma forsi ittri jew aktar?

376
00:18:34,950 --> 00:18:37,820
>> Ukoll, jirriżulta li l-
dinja tal-kompjuter, għal bosta snin,

377
00:18:37,820 --> 00:18:43,300
sempliċiment adotta arbitrarja iżda
standard konsistenti li l-mapep numri

378
00:18:43,300 --> 00:18:44,610
għall-ittri tal-alfabett.

379
00:18:44,610 --> 00:18:47,120
Per eżempju, hawnhekk hija
silta minn dak mapping.

380
00:18:47,120 --> 00:18:48,350
Huwa sejjaħ ASCII.

381
00:18:48,350 --> 00:18:53,220
A-S-C-I-I. U li hija sempliċement
tabella li mapep letters-- uppercase

382
00:18:53,220 --> 00:18:56,600
f'dan case-- biex Deċimali numri.

383
00:18:56,600 --> 00:18:57,890
>> Imma x'inhu l-implikazzjoni?

384
00:18:57,890 --> 00:19:01,090
Ukoll, jekk inti fil-fatt tixtieq li jirrappreżentaw
xi ħaġa simili email jew xi test

385
00:19:01,090 --> 00:19:03,310
fuq paġna web, inti
ovvjament tixtieq li juru

386
00:19:03,310 --> 00:19:06,100
l-ittri tal-bniedem tal-
alfabett, mhux in-numri.

387
00:19:06,100 --> 00:19:09,140
Allura jiddependi fuq il-
kuntest tal-programm

388
00:19:09,140 --> 00:19:12,600
li utent qed tuża, jekk huwa
web browser jew klijent email,

389
00:19:12,600 --> 00:19:16,090
numri jista 'ċertament tkun
interpretata bħala ittri.

390
00:19:16,090 --> 00:19:20,290
Jiġifieri, mudelli ta 'bits jistgħu
faċilment jiġi interpretat bħala ittri.

391
00:19:20,290 --> 00:19:24,700
>> U hekk dak li nistgħu jkollhom
hija l-ittra A benesseri

392
00:19:24,700 --> 00:19:28,410
rappreżentati kif 65, B
li jkunu rrappreżentati bħala 66.

393
00:19:28,410 --> 00:19:30,900
Mela jekk għandna super
kelma qasir, bħall hi,

394
00:19:30,900 --> 00:19:35,740
dak kompjuter kieku finalment
jaħżen fil deċimali imma verament fl binarju,

395
00:19:35,740 --> 00:19:40,070
jużaw xi sekwenza ta 'bits, lieva
daqsxejn ta 'elettriku b'xi mod,

396
00:19:40,070 --> 00:19:44,010
tkun l-żewġ numri 72 u 73.

397
00:19:44,010 --> 00:19:46,780
>> Iżda l-mudell ta 'bits li
jirrappreżenta dawk il-valuri.

398
00:19:46,780 --> 00:19:49,820
Allura dawn imbagħad huma kif nistgħu
jirrappreżentaw inputs tagħna u l-outputs.

399
00:19:49,820 --> 00:19:52,630
U huwa biżżejjed li jingħad, nistgħu
do rappreżentazzjonijiet aktar kumplessi

400
00:19:52,630 --> 00:19:56,450
finalment ma 'affarijiet bħal
grafika, videos, mużika, u aktar

401
00:19:56,450 --> 00:19:58,190
kif aħna ser tara aktar tard dan it-terminu.

402
00:19:58,190 --> 00:20:00,630
>> Allura li biss tħalli mbagħad
algoritmi, dawn is-settijiet

403
00:20:00,630 --> 00:20:03,490
ta 'struzzjonijiet li magħhom
aħna qed jissolvew problemi attwali.

404
00:20:03,490 --> 00:20:05,820
Aħna qed tgħaddi fl inputs għall algoritmi.

405
00:20:05,820 --> 00:20:09,630
U dawk algoritmi qed jipproduċu
outputs, l-outputs nisperaw korretta

406
00:20:09,630 --> 00:20:14,160
u wieħed jittama, wisq,
effiċjenti outputs miġbura.

407
00:20:14,160 --> 00:20:16,890
Fi kliem ieħor, huwa ħaġa waħda
biex jimplimentaw xi ħaġa korrett.

408
00:20:16,890 --> 00:20:20,790
Hija ħaġa oħra li jimplimentaw
xi ħaġa sew jew b'mod effiċjenti.

409
00:20:20,790 --> 00:20:23,690
>> Per eżempju, dimostrazzjoni wieħed
li aħna qed fond ta 'fil-kors

410
00:20:23,690 --> 00:20:24,460
huwa dan wieħed.

411
00:20:24,460 --> 00:20:26,345
Imma dawn l-affarijiet huma jkollna
dejjem aktar diffiċli li ssib.

412
00:20:26,345 --> 00:20:28,930
Iżda dan huwa tabilħaqq iskola antika
ktieb tat-telefon, ġewwa li minnhom

413
00:20:28,930 --> 00:20:32,580
huma 1,000 paġni plus ta '
ismijiet u numri tat-telefon.

414
00:20:32,580 --> 00:20:34,830
U jekk jien ridt li tfittex up
xi ħadd f'dan il-ktieb tat-telefon,

415
00:20:34,830 --> 00:20:38,640
I tista 'sempliċiment tagħmel
algoritmu naive ħafna.

416
00:20:38,640 --> 00:20:42,150
I jistgħu jiftħu l-ewwel paġna, u
I tista 'tibda biex tfittex, ngħidu aħna, xi ħadd

417
00:20:42,150 --> 00:20:43,130
jismu Mike Smith.

418
00:20:43,130 --> 00:20:46,160
U jekk huwa ma fuq l-ewwel
paġna, I-progress għat-tieni,

419
00:20:46,160 --> 00:20:49,120
u mbagħad it-tielet, u mbagħad
għar-raba ', u oħrajn,

420
00:20:49,120 --> 00:20:51,430
sal I finalment issib Mike Smith.

421
00:20:51,430 --> 00:20:53,010
>> Issa huwa li algorithm korretta?

422
00:20:53,010 --> 00:20:53,896
>> UDJENZA: Iva.

423
00:20:53,896 --> 00:20:54,248
>> DAVID J. Malan: Yeah.

424
00:20:54,248 --> 00:20:56,039
Jekk hu fil hemm, I ser
eventwalment issib lilu.

425
00:20:56,039 --> 00:20:58,820
Iżda huwa forsi mhux ħafna
effiċjenti, ċertament mhux mgħaġġel,

426
00:20:58,820 --> 00:21:01,200
għaliex, my god, għaliex jien
ħela flipping ħin tiegħi

427
00:21:01,200 --> 00:21:04,500
kollha permezz ta 'dawn il-paġni meta I jistgħu
ċertament tagħmel dan fiżikament aktar mgħaġġel?

428
00:21:04,500 --> 00:21:08,210
>> Well, ottimizzazzjoni żgħir, hekk li
jitkellmu, jista 'jkun ma wieħed page fi żmien,

429
00:21:08,210 --> 00:21:11,610
iżda tnejn, erba, sitta, tmienja, 10.

430
00:21:11,610 --> 00:21:12,725
Still korretta?

431
00:21:12,725 --> 00:21:14,030
>> UDJENZA: No

432
00:21:14,030 --> 00:21:17,040
>> DAVID J. Malan: Allura l-ebda jekk I għal
Pereżempju skip fuq Mike Smith.

433
00:21:17,040 --> 00:21:20,530
Iżda sakemm I back pedala
paġna waħda, jekk I jaqbżu lilu,

434
00:21:20,530 --> 00:21:25,240
forsi nistgħu jikkoreġu dak
inkella jistgħu jkunu gotcha.

435
00:21:25,240 --> 00:21:26,020
>> Iżda huwa aħjar?

436
00:21:26,020 --> 00:21:27,469
Huwa aktar mgħaġġel?

437
00:21:27,469 --> 00:21:28,010
I mean, yeah.

438
00:21:28,010 --> 00:21:30,950
Huwa litteralment darbtejn aktar malajr
jekk I do żewġ paġni kull darba.

439
00:21:30,950 --> 00:21:35,720
Mela jekk jien oriġinarjament kien 1,000 paġni,
issa I biss għandek flip 500 darba,

440
00:21:35,720 --> 00:21:39,429
mhumiex kompletament 1,000 paġni li tikseb
potenzjalment fl-agħar każ

441
00:21:39,429 --> 00:21:41,220
sa l-aħħar tat-telefon
ktieb, fejn xi ħadd

442
00:21:41,220 --> 00:21:44,380
bħall Mike Smith jew xi ħadd ma '
isem aktar tard jistgħu attwalment ikunu.

443
00:21:44,380 --> 00:21:46,540
>> Imma, naturalment, aħna
bnedmin ċertament mhumiex

444
00:21:46,540 --> 00:21:49,250
se tkun qed twettaq dan, ċertament
mhux fil dan il-punt fil-ħajja tagħna.

445
00:21:49,250 --> 00:21:51,454
X'inhu raġonevoli
bniedem probabbli se jagħmlu?

446
00:21:51,454 --> 00:21:52,870
UDJENZA: Mur dritti għal The9 tal S.

447
00:21:52,870 --> 00:21:53,860
DAVID J. Malan: Mur dritti għall-tal-S?

448
00:21:53,860 --> 00:21:55,563
Kif nista go straight għall-tal-S?

449
00:21:55,563 --> 00:21:57,342
>> UDJENZA: RIP min-nofs.

450
00:21:57,342 --> 00:21:59,050
DAVID J. Malan: Well,
hemm l-ebda mmarkar.

451
00:21:59,050 --> 00:22:02,116
Allura, iva, jekk kien hemm tabilħaqq
tikketta jew tab twaħħal għall S,

452
00:22:02,116 --> 00:22:03,240
għandna jaqbżu hemm dritt.

453
00:22:03,240 --> 00:22:05,420
Iżda huwa pjuttost innokwa.

454
00:22:05,420 --> 00:22:08,480
Allura l-aħjar I tista 'tagħmel huwa bejn wieħed u ieħor
għat-taqsima S jew forsi bejn wieħed u ieħor

455
00:22:08,480 --> 00:22:09,650
fis-nofs.

456
00:22:09,650 --> 00:22:12,110
Iżda l-takeaway ċavetta
now-- u l-intuwizzjoni

457
00:22:12,110 --> 00:22:14,430
li inti ħadt għall
mogħtija għas-snin probably--

458
00:22:14,430 --> 00:22:17,103
hija li dak do you issa
jafu dwar din il-problema?

459
00:22:17,103 --> 00:22:19,320
>> UDJENZA: [inaudible]

460
00:22:19,320 --> 00:22:22,290
>> DAVID J. Malan: Mike Smith huwa żgur
mhux Din it-taqsima tal-problema

461
00:22:22,290 --> 00:22:25,600
għax Smith jiġi wara l-nofs
li huwa bejn wieħed u ieħor it-taqsima M,

462
00:22:25,600 --> 00:22:26,510
jidher li jkun.

463
00:22:26,510 --> 00:22:30,340
Allura kif inti tista raw fil
Visitas, nistgħu issa litteralment

464
00:22:30,340 --> 00:22:31,737
tiċrita din il-problema fil nofs.

465
00:22:31,737 --> 00:22:32,320
UDJENZA: Woo!

466
00:22:32,320 --> 00:22:33,690
DAVID J. Malan: Huwa
jkollna aktar faċli u aktar faċli.

467
00:22:33,690 --> 00:22:34,666
[Applause]

468
00:22:34,666 --> 00:22:36,618
Hemm inti tmur.

469
00:22:36,618 --> 00:22:39,060
[Rires]

470
00:22:39,060 --> 00:22:41,870
U issa I fundamentalment
jkollhom l-istess problema,

471
00:22:41,870 --> 00:22:43,866
imma hija litteralment nofs bħala kbar.

472
00:22:43,866 --> 00:22:45,240
Jien xorta tfittex Mike Smith.

473
00:22:45,240 --> 00:22:47,950
And I daresay, I xorta jistgħu
tfittex għalih bl-istess mod,

474
00:22:47,950 --> 00:22:51,200
qsim il-problema fil nofs
darb'oħra, dmugħ il-problema mill-ġdid

475
00:22:51,200 --> 00:22:54,140
fil nofs, li issa tħalli lili ma
problema kwart tad-daqs,

476
00:22:54,140 --> 00:22:58,710
drammatiku tarmi li nofs bogħod, u
irrepeti dan il-proċess ġdid u għal darb'oħra

477
00:22:58,710 --> 00:23:01,150
u għal darb'oħra, glancing stabbiliti
f'kull punt biex tara

478
00:23:01,150 --> 00:23:03,400
jekk Mike Smith huwa fuq
il-paġna in kwistjoni.

479
00:23:03,400 --> 00:23:06,190
>> Issa jekk I tagħmel dan id-dritt,
finalment I ser issib myself

480
00:23:06,190 --> 00:23:11,085
mal biss paġna waħda li fuqha Mike Smith
hija jekk hu tabilħaqq fil-ktieb tat-telefon.

481
00:23:11,085 --> 00:23:13,510
Of course, I jistgħu
qatt sejħa Mike darb'oħra.

482
00:23:13,510 --> 00:23:18,800
Iżda l-punt hawnhekk hija li jekk bdejna
1,000 paġni, l-ewwel algoritmu tiegħi,

483
00:23:18,800 --> 00:23:21,620
flip-paġna, forsi 1,000 times--
definittivament inqas għaliex dan huwa

484
00:23:21,620 --> 00:23:26,430
isem S u mhux isem Z, iżda bħala
ħafna bħala 1,000 paġni potenzjalment.

485
00:23:26,430 --> 00:23:27,590
>> It-tieni algoritmu, aħjar.

486
00:23:27,590 --> 00:23:28,480
500 paġni.

487
00:23:28,480 --> 00:23:31,230
It-tielet algoritmu, għalkemm,
kemm passi ikun jidher

488
00:23:31,230 --> 00:23:35,520
jieħdu biex jaqsam paġna 1,000
ktieb tat-telefon fil nofs bħal dik?

489
00:23:35,520 --> 00:23:37,000
10, jagħtu jew jieħu.

490
00:23:37,000 --> 00:23:40,770
Allura biss mill flipping permezz ta 'dak
ktieb tat-telefon, l-għadis u conquering,

491
00:23:40,770 --> 00:23:46,130
biex ngħidu hekk, 10 darbiet, se nagħmel
tiegħi mod isfel sa wieħed biss paġna waħda.

492
00:23:46,130 --> 00:23:48,880
>> U hekk aħna tista 'qbid dan intwizzjoni
issa ftit grafikament

493
00:23:48,880 --> 00:23:51,320
jekk inti biss tikkunsidra
din il-graff super sempliċi.

494
00:23:51,320 --> 00:23:55,470
Aħna fuq l-assi-x, jew orizzontali
assi, huwa d-daqs tal-problema tiegħi,

495
00:23:55,470 --> 00:23:57,100
l-għadd ta 'paġni fil-ktieb tat-telefon.

496
00:23:57,100 --> 00:23:59,040
U xjenzjati tal-kompjuter
ġeneralment simili għal sejħa

497
00:23:59,040 --> 00:24:02,180
-daqs ta 'n problema, fejn
n huwa biss ftit varjabbli li

498
00:24:02,180 --> 00:24:04,310
represents-- f'dan
case-- numru ta 'paġni.

499
00:24:04,310 --> 00:24:07,412
>> Il vertikali, jew y-axis, hawnhekk huwa
se jkun il-ħin biex issolvi,

500
00:24:07,412 --> 00:24:09,870
forsi l-għadd ta 'dawriet paġna,
forsi l-għadd ta 'sekonda

501
00:24:09,870 --> 00:24:11,960
jew minuti, ikun xi
unità tiegħek ta 'miżura huwa.

502
00:24:11,960 --> 00:24:14,337
U hekk din il-linja ħamra
tirrappreżenta l-ewwel algoritmu,

503
00:24:14,337 --> 00:24:16,670
għaliex hemm 00:59
relazzjoni bejn numru

504
00:24:16,670 --> 00:24:18,880
ta 'paġni u l-ammont ta' ħin li tieħu.

505
00:24:18,880 --> 00:24:22,240
>> Jekk Verizon jirdoppja l-għadd ta '
paġni fil-ktieb tat-telefon sena d-dieħla,

506
00:24:22,240 --> 00:24:24,590
running tiegħi time-- il
ħin meħtieġ biex tesegwixxi

507
00:24:24,590 --> 00:24:27,610
li l-ewwel algorithm--
jirdoppja fl-agħar każ.

508
00:24:27,610 --> 00:24:30,690
Iżda t-tieni algoritmu,
fejn jien flipping permezz tnejn,

509
00:24:30,690 --> 00:24:33,650
teħtieġ inqas ħin għall-
problema daqs partikolari.

510
00:24:33,650 --> 00:24:36,090
Mela jekk ikolli dan ħafna
avviż paġni here--

511
00:24:36,090 --> 00:24:38,870
li l-linja isfar
jissuġġerixxi inqas ħin biex issolvi.

512
00:24:38,870 --> 00:24:42,490
U fil-fatt, dan jirrappreżenta,
aħna ser ngħidu, n matul tnejn.

513
00:24:42,490 --> 00:24:47,717
>> Imma x'inhu l-forma tat-tielet
u l-kurva finali li jmur għand look like?

514
00:24:47,717 --> 00:24:50,800
Yeah, huwa tabilħaqq għaddej biex look-- I
ma nafx dak li inti kienu se ngħid.

515
00:24:50,800 --> 00:24:52,300
Imma ejja ara dak
inti kienu se ngħid.

516
00:24:52,300 --> 00:24:53,280
>> UDJENZA: Bħall dik.

517
00:24:53,280 --> 00:24:57,060
>> DAVID J. Malan: Huwa ser look like
dan, exactly-- slope-- logaritmika

518
00:24:57,060 --> 00:24:59,770
fejn inti għandek din l-inklinazzjoni kurjuż.

519
00:24:59,770 --> 00:25:01,235
Huwa m'għadux linja dritta.

520
00:25:01,235 --> 00:25:05,000
U x'hemm konvinċenti dwar dan hija li
anki jekk il-graff issa tiġi maqtugħa,

521
00:25:05,000 --> 00:25:07,790
inti tista estrapolati fil tiegħek
f'moħħu li dik il-linja ħadra mhux

522
00:25:07,790 --> 00:25:10,060
ser iżżid fil
għoli kollha li ħafna

523
00:25:10,060 --> 00:25:13,500
kif inti jipproċedi iżjed
stabbilit li assi orizzontali.

524
00:25:13,500 --> 00:25:15,890
>> Tabilħaqq, Verizon, għal
Pereżempju, jista 'jirdoppja

525
00:25:15,890 --> 00:25:19,100
l-għadd ta 'paġni fil-phone
ktieb bejn din is-sena u s-sena d-dieħla

526
00:25:19,100 --> 00:25:22,140
minn 1,000 sa l-2000
paġni, iżda l-ebda big deal.

527
00:25:22,140 --> 00:25:24,960
Ma 'din it-tielet u finali,
hemm algoritmu intuwittivi

528
00:25:24,960 --> 00:25:26,209
ta 'diviżjoni u conquering.

529
00:25:26,209 --> 00:25:29,000
Huwa ser jieħu me kif ħafna aktar
passi sena d-dieħla biex issib xi ħadd

530
00:25:29,000 --> 00:25:29,700
simili Mike Smith?

531
00:25:29,700 --> 00:25:30,560
>> UDJENZA: One.

532
00:25:30,560 --> 00:25:31,230
>> DAVID J. Malan: Hemm wieħed biss.

533
00:25:31,230 --> 00:25:34,430
U jistgħu jikkwadrupla dan, huwa
ser tieħu me biss żewġ passi aktar

534
00:25:34,430 --> 00:25:35,210
u ibqa 'sejjer hekk.

535
00:25:35,210 --> 00:25:38,730
U hekk dan huwa xhieda li
kemm xi disinn bir-reqqa

536
00:25:38,730 --> 00:25:42,437
u xi apprezzament għal dak
inputs tiegħek huma jistgħu jagħmlu saħansitra aħjar.

537
00:25:42,437 --> 00:25:44,270
Issa aħna qed qerq a
ftit fis-sens

538
00:25:44,270 --> 00:25:46,350
li aħna qed jitqawwa suppożizzjoni.

539
00:25:46,350 --> 00:25:48,500
X'inhu suppożizzjoni tiegħi
dwar il-ktieb tat-telefon tagħna

540
00:25:48,500 --> 00:25:52,720
li permessi me li jaqsam u jirbħu
b'dan il-mod intuwittivi u għadhom korretta?

541
00:25:52,720 --> 00:25:53,705
>> UDJENZA: [inaudible]

542
00:25:53,705 --> 00:25:54,580
DAVID J. Malan: Yeah.

543
00:25:54,580 --> 00:25:55,440
Għalhekk ġiet ordnata.

544
00:25:55,440 --> 00:25:57,392
Kien alphabetized mill
il-kumpanija ktieb tat-telefon.

545
00:25:57,392 --> 00:26:00,100
Kieku kien sabiex każwali, li
tkun enfer ta 'ktieb tat-telefon,

546
00:26:00,100 --> 00:26:02,850
iżda ċertament mhux se
jsellef ruħha li l-algoritmu

547
00:26:02,850 --> 00:26:05,950
I użati, għaliex inti qatt ma
biss jiġri madwar Mike Smith

548
00:26:05,950 --> 00:26:09,210
jekk inti tinżamm diviż fi
nofs b'dan il-mod b'kumbinazzjoni.

549
00:26:09,210 --> 00:26:12,060
>> Mela ejja issa jifformalizzaw
x'hemm b'mod ċar intuwittivi.

550
00:26:12,060 --> 00:26:13,950
Allura xi ħaġa imsejħa
pseudocode huwa fejn aħna ser

551
00:26:13,950 --> 00:26:15,780
tibda xi wħud mill-problemi inizjali tagħna.

552
00:26:15,780 --> 00:26:20,410
U dan huwa mod ġeneriku ta jiddeskrivu
algoritmu jew programm tal-kompjuter,

553
00:26:20,410 --> 00:26:24,150
ma jużawx C, jew C ++ jew Java,
jew kwalunkwe lingwa speċifika,

554
00:26:24,150 --> 00:26:27,430
iżda biss bl-użu Ingliż, bil
li kwalunkwe bniedem jista 'jkun familjari.

555
00:26:27,430 --> 00:26:31,220
>> U nistgħu jiktbu l pseudocode
għal din il-problema kif ġej.

556
00:26:31,220 --> 00:26:33,520
Pass wieħed, aqbad il-ktieb tat-telefon.

557
00:26:33,520 --> 00:26:35,840
Pass tnejn, miftuħa għall nofs ta 'ktieb tat-telefon.

558
00:26:35,840 --> 00:26:37,730
Pass tlieta, tħares lejn l-ismijiet.

559
00:26:37,730 --> 00:26:40,630
Pass erba, jekk Smith hija fost names--

560
00:26:40,630 --> 00:26:42,960
>> U issa dan huwa
jibnu interessanti.

561
00:26:42,960 --> 00:26:44,290
Huwa punt ta 'deċiżjoni.

562
00:26:44,290 --> 00:26:47,920
Huwa furketta fit-triq, jekk inti
se, fergħa, biex ngħidu hekk.

563
00:26:47,920 --> 00:26:50,810
So jien ser-inċiż
biss billi konvenzjoni step--

564
00:26:50,810 --> 00:26:53,950
mhux five-- li huwa li
jiġifieri, I ser sejħa Mike.

565
00:26:53,950 --> 00:26:57,290
Allura dan indentazzjoni, totalment
konvenzjoni bniedem arbitrarja, imma hija

566
00:26:57,290 --> 00:27:01,160
sempliċiment maħsuba biex twassal semantikament
li jekk Smith hija fost ismijiet,

567
00:27:01,160 --> 00:27:03,310
imbagħad I għandhom sejħa Mike.

568
00:27:03,310 --> 00:27:06,630
>> Sadanittant fil-pass sitt, avviż
li l-indentazzjoni marret.

569
00:27:06,630 --> 00:27:10,980
Allura inkella huwa l-furketta ieħor fil-
triq, it-triq l-oħra I tista 'tivvjaġġa.

570
00:27:10,980 --> 00:27:14,130
Mela inkella jekk Smith huwa
aktar kmieni fil-ktieb, x'hemm

571
00:27:14,130 --> 00:27:16,964
pass li jmiss tiegħi probabbilment se jkun hawn?

572
00:27:16,964 --> 00:27:18,380
UDJENZA: Inti tmur għall-naħa tax-xellug.

573
00:27:18,380 --> 00:27:21,004
DAVID J. Malan: Yeah, hekk mur
in-nofs xellugi tal-ktieb tat-telefon.

574
00:27:21,004 --> 00:27:24,140
Armi l nofs tal-lemin jekk
Smith huwa kmieni fil-ktieb.

575
00:27:24,140 --> 00:27:27,140
Allura miftuħa għall-nofs ta '
in-nofs xellugi tal-ktieb.

576
00:27:27,140 --> 00:27:30,240
>> U mbagħad pass tmienja, mur għal-linja tlieta.

577
00:27:30,240 --> 00:27:34,520
U dan huwa loop kurjuż jien
jinduċu, a recursion biex ngħidu hekk.

578
00:27:34,520 --> 00:27:35,990
Iżda aktar fuq li fil-futur.

579
00:27:35,990 --> 00:27:39,590
>> Jien jużaw istess algoritmu tiegħi,
istess pseudocode tiegħi,

580
00:27:39,590 --> 00:27:43,020
biex isolvu l-istess problema mill-ġdid
minħabba li l-unika ħaġa li biddel

581
00:27:43,020 --> 00:27:46,550
huwa d-daqs tal-problema, mhux
għan tiegħi, u mhux il-persuna

582
00:27:46,550 --> 00:27:47,340
I infittex.

583
00:27:47,340 --> 00:27:51,610
So I tista 'użu mill-ġdid l-algoritmu
li stajt diġà definiti.

584
00:27:51,610 --> 00:27:53,580
>> Else jekk Smith ikun aktar tard
fil book-- inti tista

585
00:27:53,580 --> 00:27:56,200
guess-- miftuħa għall-nofs ta '
il-nofs tal-lemin tal-ktieb.

586
00:27:56,200 --> 00:27:58,350
U għal darb'oħra, mur għal-linja tlieta.

587
00:27:58,350 --> 00:28:01,480
Else-- x'inhu l-linja finali
f'dan il-programm se jkun?

588
00:28:01,480 --> 00:28:03,580
Jekk huwa ma fost il-
ismijiet fuq il-paġna jien

589
00:28:03,580 --> 00:28:06,870
fuq, jekk huwa ma kmieni fil
il-ktieb, u hu mhux aktar tard

590
00:28:06,870 --> 00:28:09,899
fil-ktieb, liema do I know
huwa veru dwar Mike Smith issa?

591
00:28:09,899 --> 00:28:11,190
UDJENZA: He mhux fil-ktieb.

592
00:28:11,190 --> 00:28:12,731
DAVID J. Malan: He mhux fil-ktieb.

593
00:28:12,731 --> 00:28:16,040
Allura l-aħjar I tista 'tagħmel huwa biss
jċedu u jieqfu dan il-programm.

594
00:28:16,040 --> 00:28:16,540
Kull dritt.

595
00:28:16,540 --> 00:28:20,350
Allura f'dan il-punt, ejja tagħti
tour malajr ta 'xi wħud mill dak li jistenna.

596
00:28:20,350 --> 00:28:23,620
U fil-fatt, jien ssieħbu hawn
minn numru ta 'staff CS50.

597
00:28:23,620 --> 00:28:26,940
Jekk dawn folks jistgħu kollha
jissieħbu me up here fuq il-palk.

598
00:28:26,940 --> 00:28:28,900
>> [Applause]

599
00:28:28,900 --> 00:28:35,280

600
00:28:35,280 --> 00:28:38,170
>> Mind you, dan huwa biss
subsett ta 'staff CS50,

601
00:28:38,170 --> 00:28:42,380
peress li kull sena għandna kważi 100 staff
membri fl-irwoli ta 'l-assistenti kors,

602
00:28:42,380 --> 00:28:44,410
tagħlim fellows, u aktar.

603
00:28:44,410 --> 00:28:45,700
Come fuq up.

604
00:28:45,700 --> 00:28:48,820
Allura dawn se jingħaqdu magħna hawn
awkwardly għal ftit mument

605
00:28:48,820 --> 00:28:54,230
kif aħna tagħti tour whirlwind ta 'dak
għandek tistenna hawn fil-kors.

606
00:28:54,230 --> 00:28:59,640
>> Allura l-ewwel u qabel kollox, għandna SAT / UNS
bħala l-għażla gradazzjoni fil-kors.

607
00:28:59,640 --> 00:29:03,180
Dan huwa maħsub deliberatament
li tkun għażla li biha

608
00:29:03,180 --> 00:29:05,570
jekk inti daqsxejn inċerti
li tkun fil-kors,

609
00:29:05,570 --> 00:29:09,390
u inti tibża failure-- anki jekk
franchement nuqqas ifisser jolqtu ħażin GPA tiegħek,

610
00:29:09,390 --> 00:29:13,180
jkollna B u mhux A-- li hija
preċiżament dak, ċertament għal portal

611
00:29:13,180 --> 00:29:15,750
kors bħal CS50 u oħrajn
korsijiet ta 'introduzzjoni,

612
00:29:15,750 --> 00:29:17,540
din l-għażla gradazzjoni hija maħsuba biex jippermettu.

613
00:29:17,540 --> 00:29:19,930
>> I helhjärtat jinkoraġġixxu
students-- speċjalment

614
00:29:19,930 --> 00:29:23,090
jekk fuq il-fence-- biex jibdew il-
kors SAT / UNS, anki jibqgħu SAT / UNS.

615
00:29:23,090 --> 00:29:27,310
Iżda int tista 'ċertament jaqilbu għal ittra
grad mill-ħames Tnejn it-terminu.

616
00:29:27,310 --> 00:29:31,560
>> Franchement, lura meta I
kien freshman fl-1995,

617
00:29:31,560 --> 00:29:34,630
I myself ma anki tieħu CS50
minħabba I ma jiksbu l-nerv

618
00:29:34,630 --> 00:29:36,540
li attwalment pass marda fil-klassi.

619
00:29:36,540 --> 00:29:40,020
Deher dominju wisq
familjari lili u verament biss

620
00:29:40,020 --> 00:29:43,080
għal dawk il-ħbieb ta 'mini,
franchement, li kien programmazzjoni

621
00:29:43,080 --> 00:29:45,570
peress li kienu sitt
jew forsi 10-il sena qodma.

622
00:29:45,570 --> 00:29:48,640
U kien biss minħabba I kien
kapaċi li jieħdu CS50 fil-jum tiegħi

623
00:29:48,640 --> 00:29:52,720
fil-verżjoni ekwivalenti ta '
SAT / pass UNS-- / jonqsu lura fil-day--

624
00:29:52,720 --> 00:29:53,850
li anke I ħa 50.

625
00:29:53,850 --> 00:29:57,440
U b'xi mod jew ieħor, jien
hawn darb'oħra miegħek illum.

626
00:29:57,440 --> 00:30:00,690
>> Issa sadanittant x'iktar inti
għandu jżomm f'moħħu dwar 50

627
00:30:00,690 --> 00:30:01,910
huwa iskrizzjoni simultanja.

628
00:30:01,910 --> 00:30:03,785
Kuntrarjament għal xnigħat li
inti tista smajt,

629
00:30:03,785 --> 00:30:07,650
inti tista ', fil-fatt, fl-istess ħin
jinkitbu fil CS50 u klassi oħra li

630
00:30:07,650 --> 00:30:12,150
jiltaqa 'l-istess jew xi jikkoinċidu
time bħala CS50 tal-lekċers dritt hawn.

631
00:30:12,150 --> 00:30:16,420
Ara l-sillabu għall-partikolaritajiet
ta 'l-implimentazzjoni tagħhom.

632
00:30:16,420 --> 00:30:19,540
>> Lectures, sadanittant, kuntrarjament għall
x'hemm uffiċjalment fil-katalogu,

633
00:30:19,540 --> 00:30:22,060
ġeneralment se biss
jiltaqgħu għal ftit siegħa.

634
00:30:22,060 --> 00:30:24,240
Fit-okkażjoni aħna jistgħu run ftit twil.

635
00:30:24,240 --> 00:30:26,800
Iżda jżomm f'moħħu li l-
għan fil CS50 s lectures

636
00:30:26,800 --> 00:30:28,980
huwa li jagħtuk
ħarsa ġenerali kunċettwali,

637
00:30:28,980 --> 00:30:31,830
nisperaw xi dimostrazzjonijiet,
forsi anki xi jingħataw b'xejn,

638
00:30:31,830 --> 00:30:34,390
ta 'dak li jistenna għall
il-ġimgħa li ġej.

639
00:30:34,390 --> 00:30:37,730
>> U għalhekk fil lectures, aħna ser tesplora
dawk is-suġġetti u eżempji flimkien,

640
00:30:37,730 --> 00:30:41,420
jġibu istudenti up fuq il-palk, u
persunal up fuq il-palk spiss kemm nistgħu,

641
00:30:41,420 --> 00:30:43,740
għal ftit ftit sigħat kull ġimgħa.

642
00:30:43,740 --> 00:30:47,435
Sezzjonijiet, sadanittant, se jkun
offruti minn dawn folks here-- ħafna

643
00:30:47,435 --> 00:30:50,060
minnhom tagħlim fellows, xi
minnhom se kors assistants--

644
00:30:50,060 --> 00:30:51,160
jiġri kull ġimgħa.

645
00:30:51,160 --> 00:30:52,940
>> U x'hemm importanti li jżomm
f'moħħu huwa li aħna

646
00:30:52,940 --> 00:30:55,920
ma have-- ma b'differenza Ewwel
Ljieli, il-mużika class--

647
00:30:55,920 --> 00:30:59,220
binarji differenti ta 'sezzjonijiet għal
studenti anqas komdu, aktar

648
00:30:59,220 --> 00:31:01,150
komdu, u x'imkien bejniethom.

649
00:31:01,150 --> 00:31:03,559
U franchement, inti taf jekk
int inqas komdi.

650
00:31:03,559 --> 00:31:05,600
U inti probabilment taf jekk
int aktar komda.

651
00:31:05,600 --> 00:31:09,920
U jekk int ma verament ċert, int
b'definizzjoni x'imkien bejniethom.

652
00:31:09,920 --> 00:31:12,850
Allura meta niġu żmien għat-taqsima
fil-ġimgħa jew hekk, kull l-sillabu,

653
00:31:12,850 --> 00:31:14,070
aħna ser jgħidlek din il-kwistjoni.

654
00:31:14,070 --> 00:31:16,890
U inti tista 'awto-tagħżel Ibbażat
fuq livell tiegħek kumdità stess

655
00:31:16,890 --> 00:31:22,220
u jkun ma students-- tkun ma aħdar
dots-- simili fl-livell ta 'kumdità lilek.

656
00:31:22,220 --> 00:31:25,710
>> Sadanittant, aħna għandna problema
settijiet, li se finalment

657
00:31:25,710 --> 00:31:28,310
jiddefinixxu l-esperjenza tiegħek f'dan il-kors.

658
00:31:28,310 --> 00:31:30,370
Huma qed offruti tipikament
fl-edizzjonijiet multipli.

659
00:31:30,370 --> 00:31:34,150
A edizzjoni standard li aħna nistennew aktar
kull student fil-kors biex jindirizzaw

660
00:31:34,150 --> 00:31:37,900
iżda wkoll l-hekk imsejħa edizzjoni Hacker
li joffri l-ebda forma ta 'kreditu addizzjonali

661
00:31:37,900 --> 00:31:41,980
outright imma verament id-drittijiet bragging
ngħid li inti ippruvati u ttrattati

662
00:31:41,980 --> 00:31:45,250
edizzjonijiet Hacker tal-kors li
approċċ il-materjal simili

663
00:31:45,250 --> 00:31:47,370
iżda minn angolu aktar sofistikati.

664
00:31:47,370 --> 00:31:49,480
>> Dak li noffru għall-
edizzjoni standard, għal,

665
00:31:49,480 --> 00:31:51,420
darb'oħra, il-maġġoranza super
ta 'studenti, mhumiex

666
00:31:51,420 --> 00:31:54,060
biss walk-throughs, li huma
videos mmexxija mill-persunal tal-kors tal-

667
00:31:54,060 --> 00:31:57,840
li verament jimxu miegħek permezz tal-
problemi kors u d-disinn possibbli

668
00:31:57,840 --> 00:31:58,910
implimentazzjonijiet.

669
00:31:58,910 --> 00:32:01,434
U aħna wkoll, wara l-
fatt, joffru postmortems,

670
00:32:01,434 --> 00:32:03,350
biha jekk int mintix
kif inti jista 'jkollhom

671
00:32:03,350 --> 00:32:05,930
jew kellha tkun solvuti xi
problema, il-persunal tat-tagħlim

672
00:32:05,930 --> 00:32:08,640
se jimxu miegħek permezz
dawk fuq video ukoll.

673
00:32:08,640 --> 00:32:14,350
>> Sadanittant, dak li jistenna wisq huma
ħamest ijiem tard u l-fatt

674
00:32:14,350 --> 00:32:16,680
li aħna se qatra tiegħek
problema aktar baxx sett score.

675
00:32:16,680 --> 00:32:20,370
Aħna ċertament japprezzaw li bi skambju
għall-ammont ta 'xogħol li 50 Jistenna

676
00:32:20,370 --> 00:32:24,020
tal inti, il-ħajja gets fil-mod
kultant, jekk mhux ħames darbiet.

677
00:32:24,020 --> 00:32:26,150
U hekk dan se joffri
inti daqsxejn ta 'flessibilità,

678
00:32:26,150 --> 00:32:29,400
testendi l-iskadenza tiegħek minn, ngħidu aħna,
Il-Ħamis f'nofsinhar biex il-Ġimgħa f'nofsinhar.

679
00:32:29,400 --> 00:32:33,150
Ara l-sillabu għall-
dettalji tal-implimentazzjoni tiegħu.

680
00:32:33,150 --> 00:32:34,702
>> Issa dak li issa jistenna?

681
00:32:34,702 --> 00:32:36,660
U huwa biss li jseħħu
lili issa biss kemm żmien

682
00:32:36,660 --> 00:32:38,333
Jien li inti guys toqgħod hawn fuq il-palk.

683
00:32:38,333 --> 00:32:39,060
>> [Rires]

684
00:32:39,060 --> 00:32:41,867
>> DAVID J. Malan: Iżda aħna ser tingħata biex
il-finitura klimatiċi qabel twil.

685
00:32:41,867 --> 00:32:43,700
Allura dak li jistenna f'termini
mis-settijiet problema?

686
00:32:43,700 --> 00:32:47,099
Well, forsi teaser ta 'dak li aħna kollha
għamlet aħħar sena ma predeċessuri tiegħek.

687
00:32:47,099 --> 00:32:49,140
Fl-ewwel sett problema
sena li għaddiet, aħna introdotti

688
00:32:49,140 --> 00:32:51,630
Scratch, a grafika
lingwa ta 'programmar li

689
00:32:51,630 --> 00:32:54,570
ihallik program litteralment mill
jittrattienu u twaqqa biċċiet puzzle,

690
00:32:54,570 --> 00:32:57,220
bħal dawn, li huma
reminixxenti tal-constructs

691
00:32:57,220 --> 00:32:59,260
se tara wieħed biss ġimgħa
għalhekk, meta aħna jaqilbu

692
00:32:59,260 --> 00:33:01,870
għal aktar tradizzjonali
lingwa, magħrufa bħala C.

693
00:33:01,870 --> 00:33:03,930
>> Sena li għaddiet ipproċediet
li dan is-sett problema,

694
00:33:03,930 --> 00:33:06,720
jinvolvu għall kriptografija,
l-scrambling ta 'informazzjoni

695
00:33:06,720 --> 00:33:10,410
li jżomm milli governattiva jew ħbieb "
għajnejn li inti ma tridx tara.

696
00:33:10,410 --> 00:33:12,540
Encoded hawnhekk hija
messaġġ li dalwaqt int

697
00:33:12,540 --> 00:33:15,740
se jkunu jistgħu decrypt jew de-ġirja.

698
00:33:15,740 --> 00:33:17,960
>> Tbegħid kienet problema
sett aħħar sena, fejn

699
00:33:17,960 --> 00:33:21,530
inti tuża dawn ġdid ta 'programmar misjuba
ħiliet biex fil-fatt jimplimentaw

700
00:33:21,530 --> 00:33:24,840
logħba wherein-- kif inti
tista 'tfakkar mill childhood--

701
00:33:24,840 --> 00:33:28,040
l-għan kien li bash l-
briks li huma atop l-iskrin

702
00:33:28,040 --> 00:33:30,190
hawn, jakkumulaw
punteġġ tul it-triq,

703
00:33:30,190 --> 00:33:35,460
u l-implimentazzjoni algoritmi tiegħek stess
li magħhom din is-soluzzjoni finalment

704
00:33:35,460 --> 00:33:37,357
ihallik jilagħbu l-logħba.

705
00:33:37,357 --> 00:33:39,440
Sadanittant, aktar tard fil-
semestru, ahna naghtuk

706
00:33:39,440 --> 00:33:43,470
dizzjunarju ta '143,091 kliem Ingliż.

707
00:33:43,470 --> 00:33:46,300
U int se tkun sfidata
jiktbu program li

708
00:33:46,300 --> 00:33:50,260
jespliċitaw kontrolli, dokumenti, billi
tagħbija kliem li ħafna fil-memorja

709
00:33:50,260 --> 00:33:52,300
mod effiċjenti possibbli.

710
00:33:52,300 --> 00:33:54,240
Ġeneralment pitting inti
kontra klassi tiegħek

711
00:33:54,240 --> 00:33:56,610
jekk inti opt fis daqsxejn ta '
sfida fil-bord mexxej

712
00:33:56,610 --> 00:34:00,090
biex tara li jistgħu jużaw l-inqas numru
sekondi ta 'running time,

713
00:34:00,090 --> 00:34:03,550
u l-inqas numru
ta 'megabytes tal-memorja,

714
00:34:03,550 --> 00:34:08,659
u fil-fatt l-irfinar programmi tiegħek
li jkun oerhört effiċjenti fir-riżorsi mhux

715
00:34:08,659 --> 00:34:09,820
biss żmien.

716
00:34:09,820 --> 00:34:13,239
>> Sena li għaddiet, wisq, ħarisna lejn il-aħħar
tas-semestru fil-programmazzjoni web.

717
00:34:13,239 --> 00:34:16,230
U fil-fatt, aħna ser tagħmel dan mill-ġdid dan
sena ma 'settijiet problema multipli,

718
00:34:16,230 --> 00:34:20,290
introduzzjoni li inti l-tekniki u
il-mentalità li magħhom inti tista 'tapplika

719
00:34:20,290 --> 00:34:23,489
dawn il-ħiliet ta 'programmazzjoni lil
websajts, websajts dinamiku,

720
00:34:23,489 --> 00:34:26,639
websajts li attwalment ssolvi
problemi u jġib ruħu differenti

721
00:34:26,639 --> 00:34:30,620
u mhumiex sempliċiment statiku
siti b'informazzjoni statika.

722
00:34:30,620 --> 00:34:32,854
>> Il-proġett finali finalment
se jiddefinixxu, għalkemm,

723
00:34:32,854 --> 00:34:34,770
l-quċċata tal-kors
għall-istudenti, fejn

724
00:34:34,770 --> 00:34:37,228
inti ser jiġi kkontestat li jimplimentaw
aktar ħaġa ta 'interess

725
00:34:37,228 --> 00:34:40,590
lilek, sakemm qualche
ispirat mill-lezzjonijiet tal-kors tal-.

726
00:34:40,590 --> 00:34:42,930
>> U kif inti raw fil-
video fil-bidu,

727
00:34:42,930 --> 00:34:47,340
aħna se tikkonkludi l-semestru mal-
CS50 Hackathon, li jekk, familjari,

728
00:34:47,340 --> 00:34:51,420
se jibda fil 07:00 bil-lejl wieħed u
jispiċċaw fi 7:00 am l-għada filgħodu.

729
00:34:51,420 --> 00:34:53,614
Madwar 09:00, aħna ser
ordni fl-ewwel pranzu.

730
00:34:53,614 --> 00:34:55,489
Madwar 01:00, aħna ser
ordni tieni pranzu.

731
00:34:55,489 --> 00:34:57,490
U jekk int xorta
wieqfa fil 05:00, aħna

732
00:34:57,490 --> 00:35:00,320
se shuttle bus inti
biex IHOP għall-kolazzjon.

733
00:35:00,320 --> 00:35:04,980
>> Il-Fiera CS50, sadanittant, huwa avveniment
li 2,000 plus fakultà, studenti,

734
00:35:04,980 --> 00:35:07,850
u l-persunal minn madwar kampus se
ġejjin biex tara kisbiet tiegħek

735
00:35:07,850 --> 00:35:10,150
fil-kors u l-finali
proġetti u l-kreazzjonijiet

736
00:35:10,150 --> 00:35:14,960
li inti toħloq fuq laptops tiegħek,
desktops, jew bozoz forsi anke dawl.

737
00:35:14,960 --> 00:35:17,340
>> Sadanittant, ħinijiet tal-uffiċċju
u l-istruttura ta 'appoġġ.

738
00:35:17,340 --> 00:35:20,480
U issa kieku stajt kien
aħjar żmien biex iġibu inti kollha up.

739
00:35:20,480 --> 00:35:24,310
>> Uffiċċju siegħa se sseħħ erba iljieli
ġimgħa għal sigħat multipli kull lejl

740
00:35:24,310 --> 00:35:27,710
b'ġeneralment 20 sa 30 ta 'l-
persunal kors dwar id-dazju f'daqqa

741
00:35:27,710 --> 00:35:31,240
li jagħtuk intima
one-on-one-opportunitajiet għal appoġġ

742
00:35:31,240 --> 00:35:33,790
ma 'settijiet problema tal-kors tal-.

743
00:35:33,790 --> 00:35:36,120
Tutoring wisq se jkun
disponibbli, partikolarment

744
00:35:36,120 --> 00:35:39,630
għall-istudenti inqas comfortable-- jew
DARE ngħid inqas comfortable-- għalihom

745
00:35:39,630 --> 00:35:41,869
ħinijiet tal-uffiċċju mhumiex l-
aktar ambjent trawwim

746
00:35:41,869 --> 00:35:43,660
u huma ċertament mhux
l-aktar stress-free.

747
00:35:43,660 --> 00:35:47,430
Speċjalment meta l-iskadenzi huma ippressar,
aħna se proattiv par inti nfusna

748
00:35:47,430 --> 00:35:51,440
ma 'membru tal-persunal biex jaħdem mar
fuq xi skeda regolari bħala bżonnijiet tiegħek

749
00:35:51,440 --> 00:35:53,850
u l-iskeda tagħhom tippermetti.

750
00:35:53,850 --> 00:35:55,260
>> U l-istaff.

751
00:35:55,260 --> 00:36:01,020
Ippermettuli li jintroduċu Davon, Rob,
u Gabriel, kapijiet din is-sena.

752
00:36:01,020 --> 00:36:02,370
Jekk inti tixtieq li kull say--

753
00:36:02,370 --> 00:36:03,349
>> [Applause]

754
00:36:03,349 --> 00:36:03,849
kelma --a.

755
00:36:03,849 --> 00:36:05,328
[Applause]

756
00:36:05,328 --> 00:36:10,270

757
00:36:10,270 --> 00:36:13,220
Davon fuq hawnhekk huwa l-
maniġer course, li

758
00:36:13,220 --> 00:36:15,730
ifisser fir-rwol tiegħu full-time
hu jgħin bl-eżekuzzjoni

759
00:36:15,730 --> 00:36:18,424
u l-loġistika ta 'CS50.

760
00:36:18,424 --> 00:36:19,340
Davon: Yeah, hi, guys.

761
00:36:19,340 --> 00:36:20,965
Int ser ikollok tara ħafna lili fil ħinijiet tal-uffiċċju.

762
00:36:20,965 --> 00:36:22,110
I ser tkun tagħlim sezzjonijiet.

763
00:36:22,110 --> 00:36:25,150
U jekk inti rimja emails quddiem,
I ser probabbilment jiġu tirrispondi.

764
00:36:25,150 --> 00:36:27,670
So I ser tara lottijiet ta 'inti kollha semestru.

765
00:36:27,670 --> 00:36:29,890
U merħba lill CS50.

766
00:36:29,890 --> 00:36:38,330
>> DAVID J. Malan: U issa Gabriel, li
innifsu kien biss freshman sena li għaddiet,

767
00:36:38,330 --> 00:36:41,820
iżda għall-aħħar ftit snin għandha
ilha topera verżjoni tiegħu stess ta 'CS50

768
00:36:41,820 --> 00:36:44,660
fil-Brażil, li biha hu jitniżżel
kollha ta 'content---kors tal-

769
00:36:44,660 --> 00:36:46,890
li qed tiġi kjarament
iffilmjati u mqiegħda online--

770
00:36:46,890 --> 00:36:51,480
sabiex ikun jista 'tittraduċi din li
Portugiż u mbagħad jgħallmu aktar minn 100

771
00:36:51,480 --> 00:36:54,610
ta klassi tiegħu fuq l-
kors ta 'koppja ta' snin,

772
00:36:54,610 --> 00:36:57,650
tagħlim fil-lingwa nattiva tiegħu
kurrikulu tal-kors tal-.

773
00:36:57,650 --> 00:36:58,964
>> GABRIEL: Hello.

774
00:36:58,964 --> 00:37:00,912
>> [Applause]

775
00:37:00,912 --> 00:37:06,669

776
00:37:06,669 --> 00:37:07,710
GABRIEL: Hi, jien Gabriel.

777
00:37:07,710 --> 00:37:09,340
Jien l-kap TF tal-kors.

778
00:37:09,340 --> 00:37:10,780
U nispera li inti ser imħabba CS50.

779
00:37:10,780 --> 00:37:12,830
Dan huwa CS50.

780
00:37:12,830 --> 00:37:14,697
>> DAVID J. Malan: Issa għall Rob.

781
00:37:14,697 --> 00:37:15,780
Oh, inti tixtieq introduzzjoni?

782
00:37:15,780 --> 00:37:16,696
>> ROB: Nru, I do not know.

783
00:37:16,696 --> 00:37:18,225
[Rires]

784
00:37:18,225 --> 00:37:19,475
DAVID J. Malan: U Rob Boden.

785
00:37:19,475 --> 00:37:22,300
[Rires]

786
00:37:22,300 --> 00:37:23,800
ROB: Hi, jien Rob.

787
00:37:23,800 --> 00:37:27,220
Dan huwa ħames sena tiegħi
involuti mal-kors.

788
00:37:27,220 --> 00:37:29,220
Kull sena, huwa biss
aħjar u l-klassi aħjar,

789
00:37:29,220 --> 00:37:31,550
Allura inti guys huma b'mod ċar
se tkun biża '.

790
00:37:31,550 --> 00:37:33,181
Nispera li intom kollha jieħdu pjaċir miegħu.

791
00:37:33,181 --> 00:37:34,430
Jien ser jieħdu pjaċir miegħu.

792
00:37:34,430 --> 00:37:36,670
Allura tara int madwar.

793
00:37:36,670 --> 00:37:38,445
>> DAVID J. Malan: U
ħin mhux se jippermetti us--

794
00:37:38,445 --> 00:37:39,670
>> [Applause]

795
00:37:39,670 --> 00:37:41,661
>> Ħin mhux se jippermettu magħna
li tintroduċi kulħadd

796
00:37:41,661 --> 00:37:44,660
fuq il-palk u kollha tal-kollegi tagħhom
li huma shopping klassijiet illum.

797
00:37:44,660 --> 00:37:47,390
Imma ippermettuli li jintroduċu
Belinda u CS50 Puzzle

798
00:37:47,390 --> 00:37:49,550
Jum, li jistenna dan
ġejjin Sibt li

799
00:37:49,550 --> 00:37:51,800
hija l-ewwel ta 'l-
avvenimenti fuq skala kbira kors'S.

800
00:37:51,800 --> 00:37:54,300
>> Dan wieħed b'mod partikolari fisser
li martell dar il-punt

801
00:37:54,300 --> 00:37:57,580
li x-xjenza tal-kompjuter hija finalment
mhux dwar l-ipprogrammar, iżda pjuttost

802
00:37:57,580 --> 00:37:59,280
dwar il-problema jissolvew b'mod aktar ġenerali.

803
00:37:59,280 --> 00:38:01,450
U Puzzle Jum, kif inti ser
tara, inti ser iġġib

804
00:38:01,450 --> 00:38:04,207
u klassi tiegħek together--
nittamaw din is-Sibt.

805
00:38:04,207 --> 00:38:04,961
>> Belinda: OK.

806
00:38:04,961 --> 00:38:05,750
Hi, guys.

807
00:38:05,750 --> 00:38:06,740
Allura grazzi.

808
00:38:06,740 --> 00:38:10,120
Allura bħala kaptan illustri tagħna
qal, Belinda isem tiegħi.

809
00:38:10,120 --> 00:38:12,100
I am a sophomore fil Quincy House.

810
00:38:12,100 --> 00:38:15,730
>> I, bħad inti guys, ħa
Sena l-aħħar CS50, verament iħobb dan.

811
00:38:15,730 --> 00:38:17,960
I jkollhom soft spot għal
inti guys fit-tielet filliera.

812
00:38:17,960 --> 00:38:21,384
U jien kburi ngħid, jien issa
f'relazzjoni impenjata

813
00:38:21,384 --> 00:38:22,300
ma CS50 [inaudible].

814
00:38:22,300 --> 00:38:22,799
OK.

815
00:38:22,799 --> 00:38:26,140
Dan kien verżjoni lame tiegħi ta Joke.

816
00:38:26,140 --> 00:38:28,320
>> Xorta waħda, hekk jimxu fuq,
biss riedu li jistiednu

817
00:38:28,320 --> 00:38:31,439
inti guys kollha għall-i-lab, jew urtikarja HBs.

818
00:38:31,439 --> 00:38:33,730
Aħna ser jkun li jkollhom
Puzzle Jum 12:00-03:00.

819
00:38:33,730 --> 00:38:37,680
U huwa opportunità kbira għalik
guys biex jilħqu kollegi CS-ħbieb tiegħek,

820
00:38:37,680 --> 00:38:42,780
isolvu uħud mill-CS puzzles, bħal Captain
imsemmi, u wkoll jieklu xi ikel b'xejn,

821
00:38:42,780 --> 00:38:46,910
jaqilgħu xi premjijiet tal-biża, bħal
karti rigal, $ 75 kull persuna,

822
00:38:46,910 --> 00:38:48,400
u also-- dak li kien dan?

823
00:38:48,400 --> 00:38:49,540
Wii U jew xi ħaġa?

824
00:38:49,540 --> 00:38:50,333
Wii U?

825
00:38:50,333 --> 00:38:51,040
Iva.

826
00:38:51,040 --> 00:38:52,330
Għal raffle tagħna.

827
00:38:52,330 --> 00:38:52,830
Tal-biża '.

828
00:38:52,830 --> 00:38:54,310
So I ser twaħħal madwar wara klassi.

829
00:38:54,310 --> 00:38:56,770
U jekk inti guys xi
mistoqsijiet, let me know.

830
00:38:56,770 --> 00:38:59,980
>> DAVID J. Malan: U tkun taf tara, lil hinn
dan hemm xejn li jagħmlu llum.

831
00:38:59,980 --> 00:39:01,920
L-ewwel problema sett
se jmorru out Ġimgħa.

832
00:39:01,920 --> 00:39:05,420
Iżda biex iġibu us dar illum, nixtieq li
jintroduċu inti speċifikament wieħed aktar

833
00:39:05,420 --> 00:39:09,080
membru tal-persunal, Colton
Ogden hawn, li f'idejha huma issa

834
00:39:09,080 --> 00:39:12,250
protetti hawn fuq inti ma
dan il-kontrollur MIDI

835
00:39:12,250 --> 00:39:15,170
li martell dar il-punt ulterjuri
li x-xjenza tal-kompjuter, wisq,

836
00:39:15,170 --> 00:39:19,130
għandha applikabilità ferm lil hinn inġinerija
u ZOKK u x-xjenza tal-kompjuter innifsu,

837
00:39:19,130 --> 00:39:22,890
testendi anke għal dawk oqsma bħall-mużika.

838
00:39:22,890 --> 00:39:30,590
>> Colton għandha ġentilment offered-- ħsibt
wieħed minnhom kien se tiffissa l-fokus.

839
00:39:30,590 --> 00:39:34,400
Andrew, jekk nistgħu jsejħu fokus
minn hawn għal ftit mument.

840
00:39:34,400 --> 00:39:36,780
>> Dak Colton għamlet
bil-quddiem huwa programm

841
00:39:36,780 --> 00:39:40,345
dan il-mezz, dan pad ta 'buttuni
li tara isaffru up here,

842
00:39:40,345 --> 00:39:42,470
bħala kontrollur MIDI,
li biha kull wieħed minn dawk buttuni

843
00:39:42,470 --> 00:39:47,080
huwa fili għal nota mużikali partikolari
jew ħoss, b'mod aktar ġenerali reġistrazzjoni,

844
00:39:47,080 --> 00:39:50,445
b'tali mod li bil-logħob mudelli ta 'dawn
buttuni, ħafna bħall-mudelli ta 'bits,

845
00:39:50,445 --> 00:39:52,620
jistgħu jirrappreżentaw oħra
kunċetti livell ogħla.

846
00:39:52,620 --> 00:39:56,750
Se hu jkun kapaċi finalment
li jqarrbuna dar hawn illum?

847
00:39:56,750 --> 00:39:59,540
Mingħajr aktar dewmien, jekk
nistgħu dim-dwal,

848
00:39:59,540 --> 00:40:03,145
u dawwar fuq l-iskrin wara Colton.

849
00:40:03,145 --> 00:40:03,865
>> UDJENZA: Woo!

850
00:40:03,865 --> 00:40:06,090
>> DAVID J. Malan: Dan huwa CS50.

851
00:40:06,090 --> 00:40:10,518
>> [Daqq ta mużika]

852
00:40:10,518 --> 00:42:46,018

853
00:42:46,018 --> 00:42:49,420
>> [Applause]

854
00:42:49,420 --> 00:42:54,766

855
00:42:54,766 --> 00:42:56,450
>> C'est għal CS50.

856
00:42:56,450 --> 00:42:57,950
Aħna se tara int Ġimgħa.

857
00:42:57,950 --> 00:42:59,890
Xi kejk jistenna inti fil-kappellun.

858
00:42:59,890 --> 00:43:04,046

859
00:43:04,046 --> 00:43:08,850
>> [Daqq ta mużika]

860
00:43:08,850 --> 00:45:49,227