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Leetcode Problem 2426. Number of Pairs Satisfying Inequality

2426. Number of Pairs Satisfying Inequality

Leetcode Solutions

Binary Indexed Tree (Fenwick Tree) Approach

  1. Initialize an empty Binary Indexed Tree (BIT) with a size large enough to accommodate the range of possible values in nums3 plus the diff and an offset to handle negative values.
  2. Transform nums1 and nums2 into nums3 by subtracting corresponding elements.
  3. Iterate over nums3 from left to right.
  4. For each element nums3[j], query the BIT for the sum of counts of elements less than or equal to nums3[j] + diff.
  5. Update the BIT by adding 1 to the index corresponding to nums3[j].
  6. Accumulate the query results to count the number of valid pairs.
  7. Return the total count of valid pairs.
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Merge Sort Tree Approach

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