H - Constructing Roads

There are N villages, which are numbered from 1 to N, and you should build some roads such that every two villages can connect to each other. We say two village A and B are connected, if and only if there is a road between A and B, or there exists a village C such that there is a road between A and C, and C and B are connected.

We know that there are already some roads between some villages and your job is the build some roads such that all the villages are connect and the length of all the roads built is minimum.

Input The first line is an integer N (3 <= N <= 100), which is the number of villages. Then come N lines, the i-th of which contains N integers, and the j-th of these N integers is the distance (the distance should be an integer within [1, 1000]) between village i and village j.

Then there is an integer Q (0 <= Q <= N * (N + 1) / 2). Then come Q lines, each line contains two integers a and b (1 <= a < b <= N), which means the road between village a and village b has been built.
Output You should output a line contains an integer, which is the length of all the roads to be built such that all the villages are connected, and this value is minimum.
Sample Input

3
0 990 692
990 0 179
692 179 0
1
1 2

Sample Output

179

题意：还是一个矩阵，一个点的横纵坐标代表起点和终点，值代表权值，然后输入q，再输入q个整数对，表示这两个点已经连通。。。求最小的权值和

思路：让输入整数对的权值为0即可：

下面附上代码：‘

#include
#include
#include
#include
#include
using namespace std;
int pre[550],zz[550],ma[550][550];
struct node
{
	int u,v,w;
}s[125010];
bool cmp(node a,node b)
{
	return a.w