func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 200018;   int arr[N];   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int n;     cin >> n;     map<long long, int> mp;     long long sum1 = 0;     for (int i = 1; i <= n; i++) {       cin >> arr[i], sum1 += arr[i];       mp[sum1] = i;     }     long long sum3 = 0, ans = 0;     for (int i = n; i >= 1; i--) {       sum3 += arr[i];       if (mp[sum3] && mp[sum3] < i) {         ans = sum3;       }     }     cout << ans;   }   