func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int a, b, c = 0;     cin >> a;     b = 1;     while (c < a) {       c = (b * (b + 1)) / 2;       b++;     }     b--;     if (c == a)       cout << b << endl;     else {       cout << b - c + a << endl;     }   }   