func_code_string: #include <bits/stdc++.h>   using namespace std;   template <typename Arg1>   void __f(const char* name, Arg1&& arg1) {     cerr << name <<   :   << arg1 << std::endl;   }   template <typename Arg1, typename... Args>   void __f(const char* names, Arg1&& arg1, Args&&... args) {     const char* comma = strchr(names + 1,  , );     cerr.write(names, comma - names) <<   :   << arg1 <<   |  ;     __f(comma + 1, args...);   }   int main() {     long long a, b;     scanf( %lld , &a);     scanf( %lld , &b);     while (a > 0 && b > 0 && (a >= 2 * b || b >= 2 * a))       if (a >= 2 * b)         a %= 2 * b;       else         b %= 2 * a;     printf( %lld %lld n , a, b);   }   