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You want to visit a strange country. There are n cities in the country. Cities are numbered from 1 to n. The unique way to travel in the country is ta 阅读全文
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解析: 裸的有向图最小生成树 代码 #include<cstdio> #include<cstring> #include<string> #include<iostream> #include<sstream> #include<algorithm> #include<utility> #incl 阅读全文
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In the war, the intelligence about the enemy is very important. Now, our troop has mastered the situation of the enemy's war zones, and known that the 阅读全文
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After a day, ALPCs finally complete their ultimate intelligence system, the purpose of it is of course for ACM ... ... Now, kzc_tc, the head of the In 阅读全文
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代码 #include<cstdio> #include<cstring> #include<algorithm> #include<stack> #include<vector> using namespace std; const int maxn=10005; vector<int> G[ma 阅读全文
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You are working for Macrohard company in data structures department. After failing your previous task about key insertion you were asked to write a ne 阅读全文
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You are given a tree with N nodes. The tree’s nodes are numbered 1 through N and its edges are numbered 1 through N − 1. Each edge is associated with 阅读全文
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You are given a tree (an acyclic undirected connected graph) with N nodes, and edges numbered 1, 2, 3...N-1. We will ask you to perfrom some instructi 阅读全文