Leetcode Problem 1664. Ways to Make a Fair Array

1664. Ways to Make a Fair Array

Leetcode Solutions

Prefix Sum Approach

  1. Initialize two variables evenSum and oddSum to store the total sum of even-indexed and odd-indexed elements respectively.
  2. Traverse the input array nums and update evenSum and oddSum accordingly.
  3. Initialize two more variables leftEvenSum and leftOddSum to keep track of the sums on the left side of the current index.
  4. Iterate through the array again, and for each index i, calculate the sums of the remaining elements if nums[i] were removed.
  5. Check if the sums of the remaining even-indexed and odd-indexed elements are equal. If they are, increment the count of fair indices.
  6. Update leftEvenSum and leftOddSum as we move to the next index.
  7. Return the count of fair indices.
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Brute Force Approach

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