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Grokking the Coding Interview Patterns in JavaScript

Solution: Valid Triangle Number

Explore how to determine the number of valid triangles from an integer array by applying sorting and the two-pointer pattern. Understand the triangle inequality rule, use pointers to find combinations efficiently, and analyze time and space complexity for this common coding interview problem.

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Statement

Given an array of integers, nums, determine the number of unique triplets that can be selected from the array such that the selected values can form the sides of a valid triangleA triangle is valid if the sum of the lengths of any two smaller sides is strictly greater than the length of the third largest side. For three sides a, b, c (such that a ≤ b ≤ c), the condition to form a valid triangle is a + b > c.. Return this count as the result.

Constraints:

  • 1<=1 <= nums.length <=1000<= 1000

  • 0<=0 <= nums[i] ...