//Exercise 3
int mostOccurring(int *arr, int n, int *countPtr);

int isAmountAsK(int *arr, int n, int k) {
	int *count = (int*)calloc((k + 1), sizeof(int)), i;
	for (i = 0; i < n; i++)
		count[arr[i]]++;
	for (i = 0; i <= k; i++) {
		if (count[i] != i) {
			free(count);
			return 0;
		}
	}
	free(count);
	return 1;
}