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// 1207. Unique Number of Occurrences
#include "leetcode.h"
/*
* given an array of integers 'arr', return 'true' if the number of occurences
* of each value in the array is unique or 'false' otherwise
*/
int cmp(const void *a, const void *b) {
return *(const int *)b - *(const int *)a;
}
int find_size(int *arr, int arr_size, int *min) {
int max = arr[0];
for (int i = 1; i < arr_size; i++) {
max = arr[i] > max ? arr[i] : max;
*min = arr[i] < *min ? arr[i] : *min;
}
return *min < 0 ? max + abs(*min) + 1 : max + 1;
}
bool uniqueOccurences(int *arr, int arr_size) {
int shift = arr[0], size = find_size(arr, arr_size, &shift);
shift = (shift > 0) ? 0 : abs(shift);
int *hash = (int *)calloc(size, sizeof(int));
for (int i = 0; i < arr_size; i++)
hash[arr[i] + shift]++;
qsort(hash, size, sizeof(int), cmp);
for (int i = 0; i + 1 < size; i++) {
if (!hash[i + 1])
break;
if (hash[i] == hash[i + 1]) {
free(hash);
return false;
}
}
free(hash);
return true;
}
int main() {
int a1[] = {1, 2, 2, 1, 1, 3}, a2[] = {1, 2},
a3[] = {-3, 0, 1, -3, 1, 1, 1, -3, 10, 0};
printf("%d\n", uniqueOccurences(a1, ARRAY_SIZE(a1))); // expect: 1
printf("%d\n", uniqueOccurences(a2, ARRAY_SIZE(a2))); // expect: 0
printf("%d\n", uniqueOccurences(a3, ARRAY_SIZE(a3))); // expect: 1
}
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