ZOJ 1879 Jolly Jumpers

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int n[3005],vis[3005];
int main()
{
int t,i,tem;
while(scanf("%d",&t)!=EOF)
{
memset(vis,0,sizeof(vis));
for(i=0;i<t;i++)
scanf("%d",&n[i]);
for(i=0;i<t-1;i++)
{
tem=abs(n[i+1]-n[i]);
vis[tem]=1;
}
for(i=1;i<=t-1;i++)
if(vis[i]==0) break;
if(i<=t-1) printf("Not jolly\n");
else printf("Jolly\n");
}
return 0;
}