青diffバチャ 0完☀ https://kenkoooo.com/atcoder/#/contest/show/829b63d7-2650-40f3-afaf-2fbdd010b8c9 復習 atcoder.jp こどふぉDiv2 システス落ちなければABDの3完 https://codeforces.com/contest/1355 青diffバチャ 2完 https://kenkoooo.com/atcoder/…