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小数转化分数

国庆补提二

莫队专题

01分数规划

2019南京赛

矩阵快速幂之奥运 hdu 2254

点分治开始！

Educational Codeforces Round 80 (Rated for Div. 2)

Codeforces Round #615 (Div. 3)

Codeforces Round #595 (Div. 3)

Educational Codeforces Round 78

http://m3.codeforces.com/contest/1296/problem/E2

静态维护区间加等差数列的求和

codeforces 623

codeforces round 589

cf rock is push dp