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Grokking the Coding Interview Patterns in C++

Solution: Valid Triangle Number

Explore how to determine the number of valid triangle triplets in an integer array by using sorting and two-pointer techniques. Understand the application of the triangle inequality rule, efficient iteration using pointers, and the time and space complexity of the solution.

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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] ...