func_code_string: #include <bits/stdc++.h>   using namespace std;   void fastio() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     cout << fixed;   }   int main() {     fastio();     int n;     cin >> n;     long long int a[n];     long long int totsum = 0;     for (int i = 0; i < n; i++) {       cin >> a[i];       totsum += a[i];     }     int m = n - 1;     m >>= 1;     long long int cursum = 0;     for (int i = 0; i < m; i++) cursum += a[2 * i];     long long int maxsum = totsum - cursum;     int last = 0;     int first = 2 * m - 2;     for (int i = 0; i < n; i++) {       cursum -= a[last];       last += 2;       last %= n;       first += 2;       first %= n;       cursum += a[first];       maxsum = max(maxsum, totsum - cursum);     }     cout << maxsum <<   n ;     return 0;   }   