1
00:00:01,477 --> 00:00:04,305
[TED-Ed 原創系列]

2
00:00:08,601 --> 00:00:10,761
《時代女神 x 程式邏輯革命》

3
00:00:11,704 --> 00:00:13,701
[上回地點：監獄]

4
00:00:13,701 --> 00:00:17,411
[今回地點：八達圍]

5
00:00:17,699 --> 00:00:19,889
[第二集：光復]

6
00:00:22,038 --> 00:00:24,606
承上回，彥霖從牢獄逃出生天後

7
00:00:24,606 --> 00:00:27,821
凌杰帶挈她一同飛往前線殖民地

8
00:00:27,821 --> 00:00:34,641
闖進八達圍這國邦圍牆下的陰霾

9
00:00:34,641 --> 00:00:38,973
殖民地住民將集結迎接每月炊事日

10
00:00:38,973 --> 00:00:41,998
城牆下的人終日搜刮人文藝術作品

11
00:00:41,998 --> 00:00:45,788
燒得旺的柴，才換來吃得飽的米

12
00:00:45,788 --> 00:00:50,378
炊事日，熔爐機器人如狼似虎到來

13
00:00:50,378 --> 00:00:54,149
機器人爐火中燒飽足，燈火才通明

14
00:00:54,149 --> 00:00:59,409
廩食才發給人果腹，不然玉石俱焚

15
00:01:00,954 --> 00:01:05,934
來到城市邊陲，凌杰剛好燃料耗盡

16
00:01:05,934 --> 00:01:08,732
逼不得已來個硬著陸

17
00:01:10,576 --> 00:01:14,996
可幸人人為著炊事日鋪張，不以為意

18
00:01:14,996 --> 00:01:17,870
今天的炊事日，彥霖可趁機找出

19
00:01:17,870 --> 00:01:20,551
地下光復運動的領袖，這個人知道

20
00:01:20,551 --> 00:01:24,819
三枚強大瑰寶中首枚的收藏地

21
00:01:24,819 --> 00:01:27,222
問題是，凌杰和彥霖都不知道

22
00:01:27,222 --> 00:01:30,618
光復領袖的名字或樣貌

23
00:01:30,618 --> 00:01:34,801
不過凌杰收集到以下情報：

24
00:01:34,801 --> 00:01:37,216
領袖有綠眼睛

25
00:01:37,216 --> 00:01:43,236
領袖是紅頭髮的話，名字有疊字母

26
00:01:43,236 --> 00:01:48,286
領袖戴眼鏡的話，名字恰好雙母音

27
00:01:48,286 --> 00:01:52,299
否則，名字恰好三母音

28
00:01:52,299 --> 00:01:57,109
上述條件全都吻合的，就只有一人

29
00:01:57,109 --> 00:01:58,324
身為逃犯

30
00:01:58,324 --> 00:02:02,514
彥霖無法潛入人群而不引入注意

31
00:02:02,514 --> 00:02:05,326
不過她可發給凌杰指示，運用她

32
00:02:05,326 --> 00:02:09,505
一件武器：程式員口中的條件式

33
00:02:09,505 --> 00:02:13,185
陳述的形式為：如果甲，則乙

34
00:02:13,185 --> 00:02:16,376
運作原理可在流程圖中活靈活現

35
00:02:16,376 --> 00:02:22,266
闡釋：條件甲真確，則執行指示乙

36
00:02:22,266 --> 00:02:26,178
有些條件式也囊括不同狀況

37
00:02:26,178 --> 00:02:30,025
比如說：若甲真確，則執行指示乙

38
00:02:30,025 --> 00:02:33,718
不然，就執行指示丙

39
00:02:33,718 --> 00:02:38,618
凌杰要甚麼指示才找出光復領袖？

40
00:02:38,828 --> 00:02:43,492
[動腦筋就按暫停，倒數三下給秘訣]

41
00:02:43,492 --> 00:02:47,407
先簡化一下，有助解答如此問題

42
00:02:47,407 --> 00:02:50,987
假如凌杰只消詢問一個人

43
00:02:50,987 --> 00:02:54,232
需要蒐集這個人甚麼資料？

44
00:02:54,232 --> 00:02:57,236
也許問：「眼睛瞳孔是綠色嗎？」

45
00:02:57,236 --> 00:03:01,688
還需問甚麼問題才找到光復領袖？

46
00:03:01,688 --> 00:03:05,728
答案得來又何以疏理？

47
00:03:05,728 --> 00:03:10,718
[動腦筋就按暫停，倒數三下揭謎底]

48
00:03:10,718 --> 00:03:14,607
依你看來，答這道題也許順理成章

49
00:03:14,607 --> 00:03:17,800
奈何凌杰畢竟是機器人，挑戰在於

50
00:03:17,800 --> 00:03:20,990
要給他有條不紊的系統指示

51
00:03:20,990 --> 00:03:23,654
任何狀況皆滴水不漏

52
00:03:23,654 --> 00:03:26,578
凌杰需要逐一詢問殖民地住民

53
00:03:26,578 --> 00:03:29,139
直至找到對的人

54
00:03:29,139 --> 00:03:32,709
換言之，就像上回破解監獄枷鎖

55
00:03:32,709 --> 00:03:36,555
這是一個重複相同指示的迴圈

56
00:03:36,555 --> 00:03:39,483
只是這次迴圈加入一系列

57
00:03:39,483 --> 00:03:41,770
以條件式呈現的問題

58
00:03:41,770 --> 00:03:45,081
一俟凌杰找到目標，迴圈便告終

59
00:03:45,081 --> 00:03:48,592
在此之前，先整理一下收集的情報

60
00:03:48,592 --> 00:03:54,570
每人有一組合特徵：眼睛色、
髮色、是否戴眼鏡、名字

61
00:03:55,130 --> 00:03:57,297
這個人有綠眼睛嗎？

62
00:03:57,297 --> 00:04:02,367
是的，眼睛色一欄打勾，不然打叉

63
00:04:02,367 --> 00:04:06,207
紅頭髮的話，名字有疊字母嗎？

64
00:04:06,207 --> 00:04:09,543
有的，就在髮色一欄打勾

65
00:04:09,543 --> 00:04:13,832
沒有疊字的，就在髮色一欄打叉

66
00:04:13,832 --> 00:04:18,582
紅頭髮卻沒有疊字母的不會是領袖

67
00:04:18,582 --> 00:04:20,832
注意若是藍頭髮

68
00:04:20,832 --> 00:04:25,432
凌杰就會跳過此題問下一題

69
00:04:25,432 --> 00:04:27,801
最後一題可以問：

70
00:04:27,801 --> 00:04:32,551
戴眼鏡的話，名字是否恰好雙母音？

71
00:04:32,551 --> 00:04:38,129
沒戴眼鏡的，名字是否恰好三母音？

72
00:04:38,129 --> 00:04:42,457
人群中總有人戴眼鏡、名字單母音

73
00:04:42,457 --> 00:04:44,864
或不戴眼鏡、名字雙母音

74
00:04:44,864 --> 00:04:48,673
兩者均不是要找的人，可以打叉

75
00:04:48,673 --> 00:04:52,198
各題答案要嘛打勾要嘛留空

76
00:04:52,198 --> 00:04:55,027
才是光復領袖

77
00:04:55,027 --> 00:04:58,113
留空是可以的，比方說藍頭髮的人

78
00:04:58,113 --> 00:05:01,923
紅頭髮那道法則就不適用

79
00:05:01,923 --> 00:05:05,511
凌杰大可逢人問盡每道題

80
00:05:05,511 --> 00:05:09,205
然後挑出只打勾或留空的人

81
00:05:09,215 --> 00:05:12,197
然而事半功倍的做法是

82
00:05:12,197 --> 00:05:16,722
一打叉就下一位

83
00:05:16,722 --> 00:05:19,294
不必悉數知道各題答案

84
00:05:19,294 --> 00:05:24,404
一打叉就足見這不是要找的人

85
00:05:26,283 --> 00:05:28,085
凌杰穿梭於人群中

86
00:05:28,085 --> 00:05:31,646
不消數分鐘就找到光復領袖艾德拉

87
00:05:31,646 --> 00:05:33,785
引到彥霖面前

88
00:05:33,785 --> 00:05:37,675
艾德拉應允襄助重奪第一枚瑰寶：

89
00:05:37,675 --> 00:05:41,018
力量之泉；惟有一個條件

90
00:05:41,018 --> 00:05:43,746
彥霖凌杰得馬上起革命，率先改造

91
00:05:43,746 --> 00:05:48,349
肆虐全城的熔爐機器人身上的程式

92
00:05:48,349 --> 00:05:51,129
話畢，機器人從天而降