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Leetcode Problem 1207. Unique Number of Occurrences

1207. Unique Number of Occurrences

Leetcode Solutions

HashMap & HashSet Approach

  1. Initialize a HashMap freq to store the frequency of each element in the array.
  2. Iterate over the array arr, incrementing the frequency count of each element in freq.
  3. Initialize a HashSet freqSet to store the unique frequencies.
  4. Iterate over the values of freq and add each frequency to freqSet.
  5. If the size of freqSet is equal to the size of freq, return true. Otherwise, return false.
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Counting Sort Approach

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