Given an array of integers arr
, return true
if the number of occurrences of each value in the array is unique or false
otherwise.
Example 1:
Input: arr = [1,2,2,1,1,3]
Output: true
Explanation: The value 1 has 3 occurrences, 2 has 2 and 3 has 1. No two values have the same number of occurrences.
Example 2:
Input: arr = [1,2]
Output: false
Example 3:
Input: arr = [-3,0,1,-3,1,1,1,-3,10,0]
Output: true
Constraints:
1 <= arr.length <= 1000
-1000 <= arr[i] <= 1000
Solution:
class Solution {
public boolean uniqueOccurrences(int[] arr) {
Map<Integer, Integer> mp = new HashMap<>();
Arrays.stream(arr).forEach(
a -> mp.put(a, mp.getOrDefault(a, 0)+1)
);
long distinctCount = mp.values().stream().distinct().count();
return distinctCount == mp.values().size();
}
}
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