代码如下，RE4个

#include <bits/stdc++.h>
using namespace std;
int main()
{
	long long n,a[2001];
	bool f[2001];
	cin>>n;
	for(long long i=1;i<=n;i++)cin>>a[i];
	memset(f,false,sizeof(f));
	for(long long i=1;i<=n-1;i++)f[abs(a[i+1]-a[i])]=true;
	for(long long i=1;i<=n-1;i++)
		if(!f[i])
		{
			cout<<"Not jolly"<<endl;
			return 0;
		}
	cout<<"Jolly"<<endl;
	return 0;
}