func_code_string: #include <bits/stdc++.h>   #pragma Optimize( O3 )   using namespace std;   int n, x, a, b, y, m, ans;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cin >> n;     vector<int> v(n);     vector<int> a;     for (int i = 0; i < n; i++) cin >> v[i];     for (int i = 0; i < n; i += 2) a.push_back(v[i]);     for (int i = 1; i < n; i += 2) a.push_back(v[i]);     a.insert(a.end(), a.begin(), a.end());     long long sumtmp = 0;     for (int i = 0; i < (n + 1) / 2; i++) sumtmp += a[i];     long long sum = sumtmp;     for (int i = (n + 1) / 2; i < a.size(); i++) {       sumtmp += a[i] - a[i - (n + 1) / 2];       sum = max(sum, sumtmp);     }     cout << sum <<   n ;     return 0;   }   