2021-09-20 2次元平面上のLIS 上記のようなやつ 問題 [ABC038-D]プレゼント https://atcoder.jp/contests/abc038/tasks/abc038_d AC https://atcoder.jp/contests/abc038/submissions/9043995 [ARC126-B]Cross-free Matching https://atcoder.jp/contests/arc126/tasks/arc126_b AC https://atcoder.jp/contests/arc126/submissions/25996438