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Grokking the Coding Interview Patterns in C#

Solution: Count Pairs Whose Sum is Less than Target

Explore how to efficiently count the number of distinct pairs in an integer array whose sums are strictly less than a given target. Learn to apply the two-pointer approach on a sorted array to optimize pair counting, reducing time complexity and improving problem-solving skills in coding interviews.

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Statement

You are given a 0-indexed integer array, nums, of length nn, and an integer target. Your task is to determine the number of distinct pairs of indexes (i,j)(i, j) such that:

  • 0≤i<j<n0 \leq i < j < n (i.e., ii comes before jj ...