Leetcode Problem 1426. Counting Elements

1426. Counting Elements

Leetcode Solutions

Approach: Search with HashSet

  1. Initialize a HashSet and a variable count to 0.
  2. Add all elements of the input array arr to the HashSet to remove duplicates and allow for O(1) lookups.
  3. Iterate over the original array arr.
  4. For each element x in arr, check if x + 1 exists in the HashSet.
  5. If x + 1 is found in the HashSet, increment count by 1.
  6. After the loop, return the count as the result.
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Approach: Search with Array

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