C. Valera and Elections The city Valera lives in is going to hold elections to the city Parliament. The city has n districts and n - 1 bidirectional roads. We know that from any district there is a path along the roads to any other district. Let's…
369C - Valera and Elections 思路:dfs,对于搜索到的每个节点,看他后面有没有需要修的路,如果没有,那么这个节点就是答案. 代码: #include<bits/stdc++.h> using namespace std; #define ll long long #define pb push_back ; vector<int>g[N]; vector<int>edge[N]; vector<int>ans; int dfs(i…
http://codeforces.com/problemset/problem/369/C 树的遍历,dfs搜一下,从根节点搜到每个分叉末尾,记录一下路况,如果有需要修复的,就把分叉末尾的节点加入答案 10w个点要用邻接表存图 #include <iostream> using namespace std ; typedef struct L{ int s,t ; int v ; int nxt ; }L ; L e[] ; ] ; int cnt ; void ins(int s,int…
题目描述: Description Given a specified total t and a list of n integers, find all distinct sums using numbers from the list that add up to t. For example, if t = 4, n = 6, and the list is [4, 3, 2, 2, 1, 1], then there are four different sums that equal…
