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Count Pairs Whose Sum is Less than Target

Explore how to efficiently count distinct pairs in an array whose sums are less than a given target number. Understand the two-pointer strategy to solve this problem effectively, preparing you to apply pattern-based approaches in coding interviews for better problem-solving and time management.

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:

  • 0i<j<n0 \leq i < j < n ...