摘要:
https://www.luogu.org/problem/P3834 #include<bits/stdc++.h> using namespace std; typedef long long ll ; const int maxn=2e5+7; int n,m,cnt,root[maxn],a 阅读全文
摘要:
https://www.luogu.org/problem/P1168 阅读全文
摘要:
https://www.luogu.org/problem/P3375 阅读全文