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- #include <iostream>
- using namespace std;
- int n, m, A[105][105], k;
- int main()
- {
- int i , j;
- cin >> n >> m >> k;
- while(m > 0)
- {
- cin >> i >> j;
- A[i][j] = A[j][i] = 1;
- m --;
- }
- for(int i = k; i <= n; i += k)
- for(int j = 1 ; j <= n ; j ++)
- A[i][j] = A[j][i] = 0;
- int cnt = 0;
- for(int i = 1 ; i < n ; i ++)
- for(int j = i + 1; j <= n; j ++)
- if(A[i][j] == 1)
- cnt ++;
- cout << cnt << '\n';
- return 0;
- }
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