Solution: Valid Triangle Number
Explore how to determine the count of valid triangle triplets from an integer array by applying the sort and search pattern. Understand how sorting and two-pointer methods simplify validating the triangle inequality rule and develop an efficient O(n²) time complexity solution.
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We'll cover the following...
Statement
Given an array of integers, nums, determine the number of triplets of distinct indices (i, j, k) that can be selected from the array such that the values at those indices can form the sides of a valid triangle.
Return this count as the result.
Note: The triplet of indices is treated as an unordered combination, not a permutation. For example, indices (0, 1, 2) and (2, 1, 0) represent the same triplet and should be counted once.
Constraints:
nums.lengthnums[i]...