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- #include <iostream>
- #include <fstream>
- using namespace std;
- int main()
- {
- int n, a[100][100]={0};
- ifstream fin("subgraf.in");
- fin>>n;
- while(!fin.eof())
- {
- int x,y;
- fin>>x>>y;
- a[x][y]=1;
- a[y][x]=1;
- }
- for(int i=1; i<=n; i++)
- for(int j=1; j<=n; j++)
- a[i][0]+=a[i][j];
- for(int i=1; i<=n; i++)
- if(a[i][0]==0 || a[i][0]==1)
- {
- for(int j=1; j<=n; j++)
- {
- a[i][j]=0;
- a[j][i]=0;
- }
- }
- for(int i=1; i<=n; i++)
- for(int j=i+1; j<=n; j++)
- if(a[i][j]==1)
- cout<<i<<" "<<j<<endl;
- return 0;
- }
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