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- #include <bits/stdc++.h>
- using namespace std;
- int n;
- int a[5005];
- bool was[400015];
- int res;
- int main(){
- cin >> n;
- for (int i = 0; i < n; i++) {
- cin >> a[i];
- int j;
- for (j = 0; j < i; j++)
- if (was[a[i] - a[j] + 200005]) break;
- if (j < i)
- res++;
- for (j = 0; j <= i; j++)
- was[a[i] + a[j] + 200005] = true;
- }
- cout << res << endl;
- return 0;
- }
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