#include "minerals.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int n, cur, ans[100100];
void dnc0(vector<int> a);
void dnc1(vector<int> L, vector<int> R, bool onL, bool onR);
int myquery(int x){
cur = Query(x);
return cur;
}
void dnc0(vector<int> a){
int s0 = cur, c = a.size() / 2;
if (c==0) return;
if (c==1){
ans[a[0]] = a[1];
ans[a[1]] = a[0];
return;
}
vector<int> L, R, Z;
for (auto &x:a){
int prv = cur;
int now = myquery(x);
if (now==prv){
R.push_back(x);
}
else{
L.push_back(x);
}
}
dnc1(L, R, 1, 1);
}
void dnc1(vector<int> L, vector<int> R, bool onL, bool onR){
// printf("dnc1: ");
// for (auto &x:L) printf("%d ", x);
// printf("\n");
// for (auto &x:R) printf("%d ", x);
// printf("\n");
int c = L.size();
if (c==0) return;
if (c==1){
ans[L[0]] = R[0];
ans[R[0]] = L[0];
return;
}
vector<int> L1, R1, L2, R2;
for (int i=0;i<c/2;i++) {L1.push_back(L[i]); myquery(L[i]);}
for (int i=c/2;i<c;i++) L2.push_back(L[i]);
for (auto &x:R){
int prv = cur;
int delta = myquery(x) - prv;
if ((!onL) == (delta==0)) R1.push_back(x);
else R2.push_back(x);
}
dnc1(L1, R1, !onL, !onR);
dnc1(L2, R2, onL, !onR);
}
void Solve(int N) {
n = N, cur = 0;
vector<int> a;
for (int i=1;i<=n*2;i++) a.push_back(i);
dnc0(a);
for (int i=1;i<=n*2;i++) if (i < ans[i]) Answer(i, ans[i]);
}
