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郁闷啊,改了好久,才发现自己的构造是错的……

Posted by Iamjw at 2007-06-03 21:18:03 on Problem 3240
也可能是我理解错了。
它说先排完前n-2排。

再构造最后两排。如果是这样,这组数据似乎就构造不出来了
9
1 2 3 4 5 25 36 49 64
10 9 8 7 6 26 37 50 67
11 13 15 17 19 27 38 51 65
39 12 14 16 18 20 28 52 66
40 21 22 23 24 29 0 53 68
41 30 31 32 33 34 35 54 69
42 43 44 45 46 47 48 55 70
56 57 58 59 60 61 62 63 71
72 73 74 75 76 77 78 79 80

=〉先构造前n-2排

9
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18
19 20 21 22 23 24 25 26 27
28 29 30 31 32 33 34 35 36
37 38 39 40 41 42 43 44 45
46 47 48 49 50 51 52 53 54
55 56 57 58 59 60 61 62 63
64 65 66 67 68 69 70 71 72
73 74 75 76 80 79 78 77 0

如果不动用前n-2排,77似乎是排不到指定位置上了?(或者我最后两排的构造方法有问题?)

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