隙あらばJOI https://onlinejudge.u-aizu.ac.jp/challenges/sources/JOI/Prelim/0654 えでゅふぉバチャ ABCDの4完 https://codeforces.com/contest/1207 青diffバチャ 1完...無念.... https://kenkoooo.com/atcoder/#/contest/show/9a3edfc6-69a9-4c44-9860-…