Euler tour

/*
I am Hunting High and Low
Diving from the sky above
Looking for, more and more, once again
I'm Hunting High and Low
Sometimes I may win, sometimes I'll lose
It's just a game that I play

After the storm there's a calm
Through the clouds shines a ray of the sun
I'm carried from all my harm
There is no one I can't outrun

Now I'm leaving my worries behind
Feel the freedom of body and mind
I'm starting my journey, I'm drifting away with the wind, I go___________________:-
*/

#include <bits/stdc++.h>
using namespace std;
typedef long long  ll;
const int N = 100+7;
vector < int > v[N], euler;
int vis[N];
void dfs(int node){
    vis[node] = 1;
    euler.push_back(node);
    for(auto i : v[node]){
        if(!vis[i]){
            dfs(i);
            euler.push_back(node);
        }
    }
}

int main(){
   ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
    int n, i, q, l, r;
    cin >> n >> q;
    for(i = 1; i <= q; i++){
        cin >> l >> r;
        v[l].push_back(r);
        v[r].push_back(l);
    }
    dfs(1);
    for(int x : euler)cout << x << ' ';

      return 0;
}