#include <bits/stdc++.h>
using namespace std;
#define TL ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define rall(s) s.rbegin(),s.rend()
#define all(s) s.begin(),s.end()
#define pb push_back
#define se second
#define fi first
#define ll long long
#define ld long double
#define YES cout<<"YES\n"
#define Yes cout<<"Yes\n"
#define yes cout<<"yes\n"
#define NO cout<<"NO\n"
#define No cout<<"No\n"
#define no cout<<"no\n"
const int N = 5e5 + 9 , mod = 1e9 + 7;
ll a[N] , b[N] , d[N] , c[N] , dp[N] ;
int valid(int n , int inputSeq[]){
int x = -1 , y , k;
for(int i = 0; i < n; i++){
if(inputSeq[i] <= n)
x = k = i , y = inputSeq[i];
}
if(x == -1)
return 1;
while((x + 1) != k){
x = (x + 1) % n;
y++;
y = (y - 1) % n + 1;
if(inputSeq[x] <= n && inputSeq[x] != y)
return 0;
}
return 1;
}
int replacement(int n, int gondolaSeq[], int replacementSeq[])
{
return -2;
}
int countReplacement(int n, int inputSeq[])
{
return -3;
}
/*
int main(){
int a[] = {2 , 3 , 6 , 1};
cout<<valid(4 , a);
}*/
// Author : حسن
Compilation message
/usr/bin/ld: /tmp/ccvGLXN5.o: in function `main':
grader.cpp:(.text.startup+0xb6): undefined reference to `valid'
/usr/bin/ld: grader.cpp:(.text.startup+0x108): undefined reference to `countReplacement'
/usr/bin/ld: grader.cpp:(.text.startup+0x132): undefined reference to `replacement'
collect2: error: ld returned 1 exit status
