Lang:G++
Edit12345678910111213141516171819202122232425262728293031#include <iostream>using namespace std;int main() {int N;cin >> N;int A[1002];for (int i = 0; i < N; i++)cin >> A[i];long long int num = 0;for (int i = 0; i < N - 1; i++){for (int j = i + 1; j < N; j++){for (int m = 0; m < N - 1; m++){if (m == i || m == j)continue;for (int n = m + 1; n < N; n++){if (n == i || n == j)continue;if (A[i] + A[j] == A[m] + A[n])num++;}}}}cout << num << endl;return 0;}