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Problem 1064 >> 用广搜WA的给你们一个样例
hautcds @ 2017-11-14 19:19:26
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6 5
1 2
2 3
4 3
4 5
5 6

答案
4 3

所以其实找最长链是错的
1430586275 @ 2017-11-30 18:59:57
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建图的问题吧
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