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- #include <bits/stdc++.h>
- using namespace std;
- ifstream f("subgraf.in");
- ofstream g("subgraf.out");
- int i,j,k,ok,v[1001],n,m,a[1001][1001];
- bool primalitate(int x)
- {
- int d;
- if(x<2)
- return false;
- if(x==2)
- return true;
- if(x%2==0)
- return false;
- for(d=3; d*d<=x; d++)
- if(x%d==0)
- return false;
- return true;
- }
- int main()
- {
- f>>n;
- while(f>>i>>j)
- {
- a[i][j]=a[j][i]=1;
- }
- for(i=1; i<=n; i++)
- if(primalitate(i))
- {
- for(j=1; j<=n; j++)
- a[i][j]=a[j][i]=0;
- }
- for(i=1; i<=n; i++)
- for(j=i+1; j<=n; j++)
- if(a[i][j]==1)
- ok++;
- g<<ok;
- return 0;
- }
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