Leetcode Problem 2670. Find the Distinct Difference Array

2670. Find the Distinct Difference Array

Leetcode Solutions

Two-Pass with Prefix and Suffix Count

  1. Initialize an empty hash set prefixSet to keep track of distinct elements in the prefix.
  2. Initialize an empty list prefixCounts to store the count of distinct elements in the prefix up to each index.
  3. Loop through the array nums from left to right.
    • Add the current element to prefixSet.
    • Append the size of prefixSet to prefixCounts.
  4. Initialize an empty hash set suffixSet to keep track of distinct elements in the suffix.
  5. Initialize an empty list diff to store the final distinct difference array.
  6. Loop through the array nums from right to left.
    • Add the current element to suffixSet.
    • Calculate the distinct difference for the current index as the size of prefixSet minus the size of suffixSet.
    • Insert the calculated difference at the beginning of the diff list.
  7. Return the diff list.
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Brute Force with Sets

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