9
19
2015
4

TopCoder ~SRM666

SRM666

WalkOverATree: 找最长链作为不回头的路(×1),贪心走其他回头的路(×2)。

SumOverPermutations: DP,$f[i][j]$表示放了$i$个元素且当前有$j$个连续段。

CountBinarySequences: 把区间构出树来之后矩阵乘法DP。

TCO15 Round 2D

BalancedSubstrings: 暴力扫过去。

BallsInBoxes: 把长度为$N-K+1$的答案区间分成一段段长度为$K$的区间,把最后一段整区间与最后的多余部分合起来。在每段区间内二分即可。

 

Category: 未分类 | Tags: | Read Count: 1239
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