`stable_sort` 和 `sort` 是不一样的。我本来用 `sort` RE了几个点，后来改成 `stable_sort` 就Wa了/kk
by cat_lover1 @ 2024-04-24 14:23:49
inspired from [这个](https://www.luogu.com/discuss/267985)
by cat_lover1 @ 2024-04-24 14:27:27