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答案是唯一的

Posted by smallbox at 2009-04-23 22:40:10 on Problem 1166
In Reply To:请教一下 The clocks 这题高斯做法的问题...ft了好几天...加急... Posted by:czyuan at 2009-04-22 16:43:36 
这个题目答案确实是唯一的,矩阵是可逆的,而且每个开关不可能转>=4次,开始我也觉得奇怪,这是求得的逆矩阵:
{3,2,3,2,2,1,3,1,0,},
{3,3,3,3,3,3,2,0,2,},
{3,2,3,1,2,2,0,1,3,},
{3,3,2,3,3,0,3,3,2,},
{3,2,3,2,1,2,3,2,3,},
{2,3,3,0,3,3,2,3,3,},
{3,1,0,2,2,1,3,2,3,},
{2,0,2,3,3,3,3,3,3,},
{0,1,3,1,2,2,3,2,3,},
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