func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(nullptr);     int n;     cin >> n;     vector<int> a(n);     for (int i = 0; i < n; ++i) cin >> a[i];     long long sum = 0;     for (int i = 0; i < n; ++i) sum += a[i];     long long cntWhite = 0;     for (int i = 0; i < n; ++i) cntWhite += (a[i] + i % 2) / 2;     cout << min(cntWhite, sum - cntWhite) <<   n ;     return 0;   }   