Leetcode Problem 2824. Count Pairs Whose Sum is Less than Target

2824. Count Pairs Whose Sum is Less than Target

Leetcode Solutions

Sort the array nums in ascending order.
Initialize two pointers, left set to 0 and right set to len(nums) - 1.
Initialize a variable count to store the number of valid pairs.
While left is less than right: a. If nums[left] + nums[right] is less than target, increment count by right - left (all pairs between left and right are valid), and increment left. b. If the sum is greater than or equal to target, decrement right.
Return the value of count.

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