func_code_string: #include <bits/stdc++.h>   using namespace std;   int freq[200005];   int arr[1005];   int main() {     ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);     int n;     cin >> n;     for (int i = 1; i <= n; i++) cin >> arr[i];     for (int i = 1; i <= n; i++)       for (int j = i + 1; j <= n; j++) freq[arr[i] + arr[j]]++;     int ans = 0;     for (int i = 0; i < 2e5 + 5; i++) ans = max(ans, freq[i]);     cout << ans;     return 0;   }   