http://www.lydsy.com/JudgeOnline/problem.php?id=1177 前缀和优化,时间复杂度$O(nm)$ 因为数据不全,快速读入会导致RE,切记! #include<cstdio> #include<cstring> #include<algorithm> using namespace std; const int N = 1503; int in() { int k = 0, fh = 1; char c = getchar()…
http://www.lydsy.com/JudgeOnline/problem.php?id=3052 题意:n个带颜色的点(m种),q次询问,每次询问x到y的路径上sum{w[次数]*v[颜色]},可以单点修改颜色.(n, m, q<=100000) #include <bits/stdc++.h> using namespace std; const int N=100005, M=100005; typedef long long ll; inline int getint()…