#include<bits/stdc++.h>
using namespace std;
vector<int> ans;
vector<int> v[41];
void rec(int u, int k) {
for(int i = 0; i < v[k].size(); i++) {
if(v[k][i]!=u){
ans.push_back(k);
rec(k,v[k][i]);
}
}
if(k != 1) {
ans.push_back(k);
}
}
vector<vector<int>> create_map(int N, int M,
vector<int> A, vector<int> B){
if(M == 0) {
vector<vector<int>> vec1(1, vector<int>(1,1));
return vec1;
}
for(int i = 0; i <= 40; i++) {
v[i].clear();
}
for(int i = 0; i < M; i++) {
v[A[i]].push_back(B[i]);
v[B[i]].push_back(A[i]);
}
ans.clear();
rec(0, 1);
int n = ans.size();
vector<vector<int>> ans1(n, vector<int>(n));
for(int i = 0; i < ans.size(); i++) {
for(int j = 0; j < ans.size(); j++){
ans1[i][j] = ans[j];
}
}
return ans1;
}
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