There are N cities in a country, and there is one and only one simple path between each pair of cities. A merchant has chosen some paths and wants to earn as much money as possible in each path. When he move along a path, he can choose one city to bu…
There are N cities in a country, and there is one and only one simple path between each pair of cities. A merchant has chosen some paths and wants to earn as much money as possible in each path. When he move along a path, he can choose one city to bu…
倍增LCA板子,没有压行,可读性应该还可以.转载请随意. #include <cstdio> #include <cstring> #include <algorithm> #include <vector> using namespace std; const int maxn = 5e5; int n, m, rt; vector<int> G[maxn]; ; ]; int dep[maxn]; void dfs(int u, int fa…
题目描述 Farmer John has installed a new system of pipes to transport milk between the stalls in his barn (), conveniently numbered . Each pipe connects a pair of stalls, and all stalls are connected to each-other via paths of pipes. FJ is pumping milk…
