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- #include <bits/stdc++.h>
- using namespace std;
- int N, I, F;
- int arr[1005];
- int32_t main() {
- cin >> N >> I >> F;
- for(int i = 1; i <= N; i++)
- cin >> arr[i];
- int contador = 0;
- for(int i = 1; i <= N; i++)
- for(int j = i + 1; j <= N; j++)
- if(arr[i] + arr[j] >= I and arr[i] + arr[j] <= F)
- contador++;
- cout << contador << endl;
- return 0;
- }
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