func_code_string: #include <bits/stdc++.h>   using namespace std;   long long int n, t;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cin >> n;     long long int f[26] = {0}, x = 0;     while (n > 1) {       int j = 0, sum = 0;       while (sum + j + 2 <= n) j = j + 2, sum += j;       f[x++] = (j - 2) / 2 + 2;       f[x++] = (j - 2) / 2 + 2;       n -= sum;     }     if (n == 1) {       f[x++] = 2;     }     long long int flag = 0;     for (int i = 0; i < x; i++) {       char c = i + 97;       while (f[i]) cout << c, f[i]--, flag = 1;     }     if (flag == 0) cout <<  x ;   }   