#include "doll.h"
#include <bits/stdc++.h>
using namespace std;
vector<vector<int>> graph;
vector<int> to;
int swit;
vector<pair<int,int>> to_swit;
void create_circuit(int M,vector<int>A){
int N=A.size();
graph.resize(M+1);
to.resize(M+1);
to[0]=A[0];
graph[0].push_back(A[0]);
for(int i=0;i<N-1;i++){
graph[A[i]].push_back(A[i+1]);
}
graph[A[N-1]].push_back(0);
for(int i=0;i<=M;i++){
if(graph[i].size()==1){
to[i]=graph[i][0];
}else if(graph[i].size()>1){
to[i]=--swit;
int last=graph[i].size()-1;
while(last>1){
to_swit.push_back({--swit,graph[i][last--]});
}
to_swit.push_back({graph[i][0],graph[i][1]});
}
}
vector<int> x(to_swit.size()),y(to_swit.size());
for(int i=0;i<to_swit.size();i++){
x[i]=to_swit[i].first;
y[i]=to_swit[i].second;
}
answer(to,x,y);
}
