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Grokking the Coding Interview Patterns in Python

Valid Triangle Number

Explore how to count all unique triplets in an array that form valid triangles by applying sorting and efficient search methods. Understand the triangle inequality rule and practice implementing this pattern to enhance problem-solving skills in coding interviews.

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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.

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