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这题可以后缀数组+单调栈写阿

Posted by Cwolf9 at 2019-07-13 23:09:15 on Problem 3294 and last updated at 2019-07-14 00:56:44 
因为答案肯定在sa上是连续的，所以很自然可以用单调栈写啊。。
不过我写了好久bug
https://blog.csdn.net/qq_39599067/article/details/95810586
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