#include<bits/stdc++.h>
using namespace std;
vector<int> ans;
vector<int> v[41];
void rec(int u, int w) {
ans.push_back(w+1);
for(int i = 0; i < v[w].size(); i++) {
if(v[w][i]!=u){
rec(w, v[w][i]);
ans.push_back(v[w][i]+1);
}
}
}
vector<vector<int>> create_map(int N, int M,
vector<int> A, vector<int> B){
for(int i = 0; i < M; i++) {
v[A[i]].push_back(B[i]);
v[B[i]].push_back(A[i]);
}
vector<vector<int>> ans1;
for(int i = 0; i < ans.size(); i++) {
ans1.push_back(ans);
}
return ans1;
}
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