HDU 5651 xiaoxin juju needs help(组合数学)

题意: $N\le 2\times 10^3的字符串,字符集大小为26$$现在重排它,问有多少个不同的回文串$     Read more
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TaoSama Apr 07, 2016

HDU 4651 Partition(五边形数)

题意: $N\le 10^5,求整数N的划分数是多少,答案对10^9+7取模$     Read more
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TaoSama Mar 28, 2016