hs-black 杂题选讲

[POI2011]OKR-Periodicity

CF1286E Fedya the Potter Strikes Back

[JSOI2019]节日庆典

[ZJOI2017]字符串

CS Academy Expected Tree Degrees

P6326 Shopping

[SDOI2017]苹果树

[HDU6566] The Hanged Man

[Gym102341G] Gurdurr

[Gym102341B] Bulbasaur

[AGC036F] Square Constraints

CF1142D Foreigner

[TJOI2018]游园会

[ZJOI2019]麻将