AtCoder Beginner Contest 216

Tasks - AtCoder Beginner Contest 216

[ABC216D] Pair of Ball

 可以发现对于栈中每个元素是被他上面的元素所约束，用拓扑排序表示这种约束

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[ABC216F] Max Sum Counting

dp合集

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[ABC216G] 01Sequence

差分约束 做题笔记

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