func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long int N = 2e5 + 5;   void solve() {     long long int n, i, j, ans = 0;     cin >> n;     long long int a[n];     for (auto &x : a) {       cin >> x;     };     map<long long int, long long int> cnt;     for (i = 0; i < n; i++) {       for (j = i + 1; j < n; j++) {         cnt[a[i] + a[j]]++;         ans = max(ans, cnt[a[i] + a[j]]);       }     }     cout << ans <<   n ;   }   signed main() {     ios_base::sync_with_stdio(0), cin.tie(NULL), cout.tie(NULL);     long long int t = 1;     while (t--) {       solve();     }   }   