Leetcode Problem 2563. Count the Number of Fair Pairs

2563. Count the Number of Fair Pairs

Leetcode Solutions

Binary Search Approach

  1. Sort the input array nums.
  2. Initialize a variable answer to store the count of fair pairs.
  3. Iterate through the array using an index i.
  4. For each element nums[i], calculate the required minimum (minRequired) and maximum (maxRequired) values that the other element of the pair must have to form a fair pair.
  5. Use binary search to find the leftmost index leftIndex where nums[leftIndex] is greater than or equal to minRequired.
  6. Use binary search to find the rightmost index rightIndex where nums[rightIndex] is less than or equal to maxRequired.
  7. If leftIndex is not greater than rightIndex, add the number of elements in the range [leftIndex, rightIndex] to answer.
  8. Return the value of answer.
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Prefix Sum and Hashing Approach

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