func_code_string: #include <bits/stdc++.h>   using namespace std;   map<int, int> s;   int a[2000];   int main(int argc, char const *argv[]) {     int n;     cin >> n;     for (int i = 0; i < n; ++i) cin >> a[i];     for (int i = 0; i < n; ++i) {       for (int j = i + 1; j < n; ++j) {         int sum = a[i] + a[j];         if (s.find(sum) == s.end())           s[sum] = 1;         else           s[sum]++;       }     }     int ans = 0;     for (auto i : s) {       ans = max(ans, i.second);     }     cout << ans << endl;     return 0;   }   