摘要: # include <bits/stdc++.h> using namespace std; const int N = 2050; int n,m; int lowbit(int x) {return x & -x;} struct _2wBIT { int a[N][N]; void clear 阅读全文
posted @ 2020-10-31 09:01 luyiming123 阅读(55) 评论(0) 推荐(0) 编辑