func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = (int)1e5 + 10;   long long int vis[N];   vector<vector<int> > v;   int dfs(int t) {     vis[t] = 1;     for (int i = 0; i < v[t].size(); i++) {       if (vis[v[t][t]] == 0) {         dfs(v[t][i]);       }     }     return 0;   }   int gcd(int a, int b) { return b == 0 ? a : gcd(b, a % b); }   int lcm(int a, int b) { return a * (b / gcd(a, b)); }   int main() {     long long int n, m;     cin >> n >> m;     while (1) {       if (n == 0 or m == 0) break;       if (n >= 2 * m)         n = n % (2 * m);       else if (m >= 2 * n)         m = m % (2 * n);       else         break;     }     cout << n <<     << m << endl;     return 0;   }   