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- #include <fstream>
- using namespace std;
- ifstream f("graf.in");
- ofstream g("graf.out");
- int n,a[101][101];
- int main()
- { f>>n;
- int i,j;
- for(i=1;i<=n;i++){
- for(j=1;j<=n;j++){
- f>>a[i][j];
- }
- }
- int c=0;
- for(i=1;i<=n;i++){
- int gr=0;
- for(j=1;j<=n;j++)
- if(a[i][j]==1) gr++;
- if(gr==3) c++;
- }
- g<<c;
- f.close();
- g.close();
- return 0;
- }
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