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6 1(1 0 2 1 1 3)这组数据为什么是-1而不是4

Posted by cd117 at 2014-12-04 11:22:14 on Problem 3009
6 1
1 0 2 1 1 3
是否可以这样走(S代表当前石头所在的位置):
第一步: left:0 S 2 1 1 3
第二步:right:0 0 S 0 1 3
第三步:right:0 0 2 S 0 3
第四步:right:0 0 2 0 0 S
结束

为什么不可以?

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