Consider a rooted tree. A rooted tree has one special vertex called the root. All edges are directed from the root. Vertex u is called a child of vertex v and vertex v is called a parent of vertex u if there exists a directed edge from v to u. A vert…
Consider a rooted tree. A rooted tree has one special vertex called the root. All edges are directed from the root. Vertex u is called a child of vertex v and vertex v is called a parent of vertex u if there exists a directed edge from v to u. A vert…
[链接] 我是链接,点我呀:) [题意] 在这里输入题意 [题解] 写个dfs看看是不是每个节点都有3个叶子节点就可以了. [代码] #include <bits/stdc++.h> using namespace std; const int N = 1e3; int n; vector <int> g[N+10]; bool ok = true; int dfs(int x){ if ((int) g[x].size()==0){ return 1; } int len = g…
Redundant Paths Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 10798 Accepted: 4626 Description In order to get from one of the F (1 <= F <= 5,000) grazing fields (which are numbered 1..F) to another field, Bessie and the rest of the…
