#include<iostream>
using namespace std; int main() { int n; int sum = 0; int num[200]; cin >> n; if (n >= 3 && n <= 100) { for (int a = 0; a < n; a++) { cin >> num[a]; } for (int i = 0; i < n; i++) { bool flag = false; for (int j = 0; j < n&&flag == false; j++) { if (j != i) for (int k = j + 1; k < n&&flag == false; k++) { if (k != i&&k != j) if (num[i] == num[j] + num[k]) { sum++; flag = true; } } } } cout << sum; } system("pause"); return 0; }
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