#include <bits/stdc++.h>
using namespace std;
#define sz(x) ((int)x.size())
void answer(vector<int> C, vector<int> X, vector<int> Y);
int n, m;
vector<int> a;
vector<vector<int>> adj;
int p = 0;
vector<int> c, x, y;
int new_switch(int g, int d) {
p++;
x.push_back(g);
y.push_back(d);
return -p;
}
int new_switch(int g) {
p++;
x.push_back(-p);
y.push_back(g);
return -p;
}
vector<int> liste;
int PR = 1;
int mom = -1;
int build(int X, int pr) {
if(pr == 1) {
mom = new_switch(0, 0);
x[-mom-1] = build(X, 2 * pr);
y[-mom-1] = build(X + pr, 2 * pr);
return mom;
}
if(pr > PR) while(1);
if(pr == PR) return (liste[X] == -1 ? mom : liste[X]);
return new_switch(build(X, 2 * pr), build(X + pr, 2 * pr));
}
int create(int t) {
if(sz(adj[t]) == 0) return 0;
if(sz(adj[t]) == 1) return adj[t][0];
if(sz(adj[t]) == 2) return new_switch(adj[t][0], adj[t][1]);
int pr = 1;
while(pr < sz(adj[t])) pr *= 2;
PR = pr;
liste.assign(pr, -1);
for(int i = 0; i < pr - sz(adj[t]); ++i)
liste[i] = -1;
for(int i = pr - sz(adj[t]); i < pr; ++i)
liste[i] = adj[t][i - pr + sz(adj[t])];
return build(0, 1);
}
/*int Create(int t, int i, int j) {
if(i > j) return 0;
if(i == j) return adj[t][i];
if(i + 2 == j) {
int p1 = new_switch(adj[t][i], adj[t][i + 1]);
int p2 = new_switch(-p-2, adj[t][i + 2]);
return new_switch(p1, p2);
}
if(i + 3 == j)
return new_switch(new_switch(adj[t][i], adj[t][i + 2]), new_switch(adj[t][i + 1], adj[t][i + 3]));
return new_switch(create(t, i, (i + j) / 2), create(t, (i + j) / 2 + 1, j));
}*/
void create_circuit(int M, vector<int> A) {
n = (int)A.size();
m = M;
a = A;
c.assign(m + 1, 0);
adj.assign(m + 1, vector<int>());
for(int i = 0; i < n - 1; ++i)
adj[a[i]].push_back(a[i + 1]);
adj[0].push_back(a[0]);
adj[a.back()].push_back(0);
/*
for(int i = 0; i <= m; ++i) {
cout << i << ": ";
for(int j : adj[i])cout<<j<<" ";
cout<<endl;
}
*/
for(int i = 0; i <= m; ++i)
c[i] = create(i);
answer(c, x, y);
}
