[Codeforces1011] Round #499 (Div. 2)（树转RMQ+莫队 or 启发式合并）

11-27

[Nowcoder283J] RMQ (线段树)

11-25

[Nowcoder283H] 图论一顿套模版 (最短路)

11-25

[Nowcoder283F] 出装方案 (状压DP or 费用流)

11-25

[GCJKickstart2018RoundH] C. Let Me Count The Ways（容斥）

11-18

[Codeforces521E] Thematic Contests(贪心)

11-17

[Codeforces520D] Fun with Integers (规律，并查集)

11-16

[Codeforces517D] Minimum path (DP, 贪心, 搜索)

10-28

[Codeforces Mail.Ru Cup 2018 Round 1] D. Changing Array (异或和，贪心)

10-19

[GCJKickstart2018RoundB] B. Sherlock and the Bit Strings

10-18