hdu1213
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http://acm.hdu.edu.cn/showproblem.php?pid=1213
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 }
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