* 왜 Accept가 안되나 했더니 검사하는 부분에서 count-1이어서......
{{{#include <stdio.h>
#include <memory.h>
#include <math.h>

int main(){
	int count;
	int a[3000];
	bool isJ[3000];

	while(true) {
		if(feof(stdin))	break;
		scanf("%d", &count);
		if(feof(stdin))	break;
		for(int i=0; i<count; i++){
			scanf("%d", &a[i]);
		}
		
		memset(isJ, false, 3000);
		if(count == 1)
			goto JOLLY;
		for(int i=1; i<count; i++){
			int index = abs(a[i]-a[i-1]);
			if(isJ[index]) {
				goto NOT_JOLLY;
				break;
			}
			isJ[index] = true;
		}

		for(int i=1; i<count; i++){
			if(isJ[i]==true);
			else {
				goto NOT_JOLLY;
			}
			if(i==count-1) goto JOLLY;
		}
		if(count==2&&isJ[1])
			goto JOLLY;
	
NOT_JOLLY:
			printf("Not jolly\n");
			continue;
JOLLY:
			printf("jolly\n");
			continue;
	}
	return 0;
}
}}}

---
{{{
#include <stdio.h>
#include <memory.h>
#include <math.h>

int main(){
	int count;
	int a[3000];
	bool isJ[3000] = {false};

	while(true) {
		if(feof(stdin))	break;
		scanf("%d", &count);
		if(feof(stdin))	break;
		for(int i=0; i<count; i++){
			scanf("%d", &a[i]);
		}

		bool F=1;
		for(int i=1; i<count; i++){
			int index = abs(a[i]-a[i-1]);
			if(isJ[index]) {
				F=0;
				break;
			}
			isJ[index] = true;
		}

		for(int i=1; i<count; i++){
			if(isJ[i]) continue;
			else {
				F=0;
				break;
			}

		}
		puts(F?"Jolly":"Not jolly");
		memset(isJ, false, 3000);
	}
	return 0;
}
}}}