func_code_string: #include <bits/stdc++.h>   using namespace std;   int n;   int a[(int)2e5][2];   int main() {     cin >> n;     if (n == 3) {       cout <<  1 2 3  << endl;       return 0;     }     for (int i = 0; i < n; i++) {       cin >> a[i][0] >> a[i][1];       a[i][0]--;       a[i][1]--;     }     int next = 0;     for (int i = 0; i < n; i++) {       cout << (next + 1) <<    ;       int b = a[next][0];       int c = a[next][1];       if (a[b][0] == c || a[b][1] == c) {         next = b;       } else {         next = c;       }     }   }   