摘要：
http://poj.org/problem?id=2421 There are N villages, which are numbered from 1 to N, and you should build some roads such that every two villages can 阅读全文
摘要：
http://poj.org/problem?id=1287 You are assigned to design network connections between certain points in a wide area. You are given a set of points in 阅读全文
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#include using namespace std; const int maxn = 5e5 + 10; int h[maxn], v[maxn], nx[maxn], in[maxn]; int n, m, sz; void add(int a, int b) { v[sz] = b; nx[sz] = h[a]; h[a] = sz; in[b] ++; s... 阅读全文
摘要：
http://poj.org/problem?id=1251 The Head Elder of the tropical island of Lagrishan has a problem. A burst of foreign aid money was spent on extra roads 阅读全文