hdu1213

 1 #include<iostream>
 2 #include<stdio.h>
 3 #include<math.h>
 4 #include<string.h>
 5 #include<stdlib.h>
 6 using namespace std;
 7 const int N=1005;
 8 int father[N];
 9 int find(int x)
10 {
11     if(father[x]!=x)
12     father[x]=find(father[x]);
13     return father[x];
14 }
15 void make(int a,int b)
16 {
17     int f1=find(a);
18     int f2=find(b);
19     if(f1!=f2)
20     father[f2]=f1;
21     return ;
22 }
23 
24 int main()
25 {
26     //freopen("in.txt","r",stdin);
27     int t;
28     cin>>t;
29     while(t--)
30     {
31         int n,m,a,b;
32         cin>>n>>m;
33         for(int i=0;i<N;i++)
34         father[i]=i;
35         for(int i=0;i<m;i++)
36         {
37             cin>>a>>b;
38             make(a,b);
39         }
40         int cnt=0;
41         for(int i=1;i<=n;i++)
42         {
43             if(father[i]==i)
44             cnt++;
45         }
46         cout<<cnt<<endl;
47     }
48     return 0;
49 }