@[0X03LL](/user/1062862)
```
#include<cstdio>
#include<iostream>
#include<algorithm>
#include<cmath>
using namespace std;
int a[1005],c[1005];
int main(){
int n;
scanf("%d",&n);
for(int i=1;i<=n;i++){
scanf("%d",&a[i]);
}
for(int i=1;i<n;i++){
c[i]=abs(a[i]-a[i+1]);
}
sort(c+1,c+n);
for(int i=1;i<n;i++){
if(c[i]!=i){printf("Not jolly\n");return 0;}
}
printf("Jolly\n");
return 0;
}
```
by billlong @ 2024-01-19 15:20:18