Codeforces

Codeforces Round 1044 (Div. 2) ABCD

C 题交互题和 D 题的 DP 都挺有意思

Codeforces Round 1045 (Div. 2) ABC

Codeforces Round 1045 (Div. 2) ABC

Codeforces Round 1046 (Div. 2) ABCD

Codeforces Round 1046 (Div. 2) ABCD

Educational Codeforces Round 184 ABCD1

Educational Codeforces Round 184 (Rated for Div. 2) ABCD1