Leetcode Problem 1885. Count Pairs in Two Arrays

1885. Count Pairs in Two Arrays

Leetcode Solutions

Binary Search Approach

  1. Initialize a new array diff of the same length as nums1 and nums2.
  2. Populate diff with nums1[i] - nums2[i] for each index i.
  3. Sort the diff array.
  4. Initialize a variable count to store the number of valid pairs.
  5. Iterate over diff using index i: a. If diff[i] is positive, increment count by the number of elements to the right of i. b. If diff[i] is non-positive, perform a binary search to find the smallest index j such that j > i and diff[j] > -diff[i]. c. Increment count by the number of elements to the right of j.
  6. Return the value of count.
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Two Pointers Approach

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