func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long n, x;     cin >> n;     vector<long long> a;     for (int i = 0; i < n; i++) {       cin >> x;       a.push_back(x);     }     for (int i = 0; i < n - 1; i++) {       cout << a[i] + a[i + 1] <<    ;     }     cout << a[n - 1] << endl;     return 0;   }   