Leetcode Problem 2122. Recover the Original Array

2122. Recover the Original Array

Leetcode Solutions

Sorting and Pairing with Greedy Approach

  1. Sort the nums array.
  2. Iterate over the sorted array starting from the second element.
  3. For each element nums[i], calculate the potential k as (nums[i] - nums[0]) / 2.
  4. Check if the potential k is positive and if nums[i] - nums[0] is even (to ensure k is an integer).
  5. If a valid k is found, attempt to pair each element in nums with its counterpart by subtracting 2k.
  6. If all elements can be paired successfully, return the constructed original array.
  7. If not all elements can be paired, continue to the next potential k.
  8. Repeat steps 3-7 until a valid original array is found or all potential k values have been tried.
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Brute Force with Sorting and Set

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