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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 target value. This lesson teaches you to use the two-pointer approach after sorting the array to optimize pair comparisons and reduce time complexity, helping you handle similar coding interview problems with confidence.

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:

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