CF521E Cycling City 题解

CF521D Shop 题解

CF516E Drazil and His Happy Friends 题解

CF512D Fox And Travelling 题解

CF506E Mr. Kitayuta's Gift 题解

CF1519F Chests and Keys 题解

[ARC080F] Prime Flip 题解

P3993 [BJOI2017] 同构 题解

CF505E Mr. Kitayuta vs. Bamboos 题解

P3974 [TJOI2015] 组合数学 题解