#include<bits/stdc++.h>
#include "gondola.h"
using namespace std;
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template <typename T> using ordset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
/*
less<T> can be changed to:
1. less_equal<T>
2. greater<T>
ordered_set functions:
1. *(os.find_by_order(x)) -> return the value at position x (0 base)
2. os.order_of_key(x) -> return the number of elements less than x
*/
typedef long long ll;
//#define int ll
#define endl '\n'
#define pb push_back
#define ff first
#define ss second
#define all(a) a.begin(),a.end()
const int MOD=1000000007;
#define gcd(a,b) __gcd(a,b)
#define lcm(a,b) (a*(b/gcd(a,b)))
#define fios(); ios_base::sync_with_stdio(0);cin.tie(0);
#define fraction(x); cout.unsetf(ios::floatfield); cout.precision(x); cout.setf(ios::fixed,ios::floatfield);
#define file(); freopen("input.txt","r",stdin);freopen("output.txt","w",stdout);
const int maxN=2e5+15;
int a[maxN];
int valid(int n,int arr[]){
//subtask 1
int new_len=n*2;
for(int i=0;i<n;i++) a[i]=arr[i];
for(int i=n;i<new_len;i++){
int ind=i-n;
a[i]=arr[ind];
}
int cur=1;
bool b=0;
for(int i=0;i<new_len;i++){
if(cur==n+1) break;
if(a[i]==1&&b==0){
b=1;
cur++;
}
else if(a[i]==cur) cur++;
else if(a[i]!=cur&&b==1) return 0;
if(cur==n+1) break;
}
return 1;
}
int replacement(int n,int gondolaSeq[],int replacementSeq[]){
return 0;
}
int countReplacement(int n,int inputSeq[]){
return 0;
}
