Leetcode Problem 2869. Minimum Operations to Collect Elements

2869. Minimum Operations to Collect Elements

Leetcode Solutions

Using HashSet to Track Unique Elements

  1. Initialize a HashSet to keep track of unique elements collected.
  2. Start iterating from the end of the array towards the beginning.
  3. For each element, check if it is less than or equal to k.
  4. If it is, add it to the HashSet.
  5. Check if the size of the HashSet is equal to k.
  6. If it is, break the loop as we have collected all required elements.
  7. Calculate the number of operations as the difference between the array size and the current index.
  8. Return the number of operations.
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Counting Elements with an Array

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