Edit: 最新提交是[这个](https://atcoder.jp/contests/abc301/submissions/42785793)
by Disjoint_cat @ 2023-06-21 18:54:57
哦，我 sb 了，`bool vis[N][N];` 数组开小了
by Disjoint_cat @ 2023-06-21 19:16:25