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OI-codes/Luogu/P2141/P2141.cpp

27 lines
533 B
C++

#include <bits/stdc++.h>
using namespace std;
int n, a[105], ans;
bool vis[105];
int main() {
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a[i];
}
sort(a + 1, a + 1 + n);
for (int i = 1; i < n - 1; i++) {
for (int j = i + 1; j < n; j++) {
for (int k = j + 1; k <= n; k++) {
if (a[i] + a[j] == a[k] && !vis[k]) {
ans++;
vis[k] = true;
}
}
}
}
cout << ans << endl;
return 0;
}