#include "gondola.h"
#include <bits/stdc++.h>
const int N=100006;
bool used[N];
int valid(int n, int inSeq[])
{
int start=-1;
for (int i=0;i<n;i++){
if (used[inSeq[i]]){
return 0;
}
used[inSeq[i]]=true;
if (inSeq[i]<=n){
if (start!=-1 && (n+i-inSeq[i]+1)%n!=start){
return 0;
}
start=(n+i-inSeq[i]+1)%n;
}
}
return 1;
}
int replacement(int n, int gondolaSeq[], int replacementSeq[])
{
return -2;
}
int countReplacement(int n, int inputSeq[])
{
return -3;
}
/*
int gondolaSequence[100001];
int replacementSequence[250001];
int main()
{
int i, n, tag;
int nr;
assert(scanf("%d", &tag)==1);
assert(scanf("%d", &n)==1);
for(i=0;i< n;i++)
assert( scanf("%d", &gondolaSequence[i]) ==1);
switch (tag){
case 1: case 2: case 3:
printf("%d\n", valid(n, gondolaSequence));
break;
case 4: case 5: case 6:
nr = replacement(n, gondolaSequence, replacementSequence);
printf("%d ", nr);
if (nr > 0)
{
for (i=0; i<nr-1; i++)
printf("%d ", replacementSequence[i]);
printf("%d\n", replacementSequence[nr-1]);
}
else printf("\n");
break;
case 7: case 8: case 9: case 10:
printf("%d\n", countReplacement(n, gondolaSequence));
break;
}
return 0;
}
*/
