func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     int l = 1;     int r = n;     bool trn = 0;     while (l <= r) {       if (!trn)         cout << l++;       else         cout << r--;       cout <<    ;       trn = !trn;     }   }   