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Future Failure CodeForces - 838C (博弈论,子集卷积)

Roads in the Kingdom CodeForces - 835F (直径)

Singer House CodeForces - 830D (组合计数,dp)

Codeforces Round #419 (Div. 1) (ABCDE)

Liar CodeForces - 822E (dp,后缀数组)

O gcd 板子

Z算法板子

手写分数类

杜教筛板子

Manthan, Codefest 19 (open for everyone, rated, Div. 1 + Div. 2) (1208F,1208G,1208H)

Keyboard Purchase CodeForces - 1238E (状压)

Gym 102055B Balance of the Force

CF1290C Prefix Enlightenment (并查集)

Crisp String CodeForces - 1117F (状压)

Putting Boxes Together CodeForces - 1030F (带权中位数)

Bipartite Segments CodeForces - 901C (区间二分图计数)

bzoj 2560 串珠子

CDQ分治学习

hihocoder 1513 小Hi的烦恼 (bitset优化)

Artem and Array CodeForces - 442C (贪心)