#include "doll.h"
#include <bits/stdc++.h>
using namespace std;
void dbg(vector<int> x) {
cout << "DBG: ";
for (auto xx: x) cout << xx << " ";
cout << "\n";
}
void create_circuit(int M, std::vector<int> A) {
int m = M;
vector<int> a = A;
int n = a.size();
vector<int> conn(m+1);
vector<vector<int>> aft(m+1);
for (int i = 0; i < n-1; i++) {
aft[a[i]].push_back(a[i+1]);
}
aft[a.back()].push_back(0);
aft[0].push_back(a[0]);
vector<int> x, y;
for (int i = 0; i <= m; i++) {
if (aft[i].empty()) {
conn[i] = i;
continue;
}
else if (aft[i].size() == 1) {
conn[i] = aft[i][0];
continue;
}
else {
x.push_back(aft[i][0]);
y.push_back(aft[i][1]);
conn[i] = -x.size();
}
}
answer(conn, x, y);
}
