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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)
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)