1207. Unique Number of Occurrences
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
GoogleTopics
Hints open one at a time
Hint 1
Find the number of occurrences of each element in the array using a hash map.
Hint 2
Iterate through the hash map and check if there is a repeated value.
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1class Solution:
2 def uniqueOccurrences(self, arr: List[int]) -> bool:
3
Starter codePython 3Spaces: 4
Loading editor…
1class Solution:
2 def uniqueOccurrences(self, arr: List[int]) -> bool:
3
Starter codePython 3Spaces: 4
Examples
Input
[1,2,2,1,1,3]
Input
[1,2]
Input
[-3,0,1,-3,1,1,1,-3,10,0]
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