Solution: Valid Triangle Number
Explore how to solve the Valid Triangle Number problem by applying sorting and a two-pointer search pattern. Understand how to count triplets that satisfy the triangle inequality, optimizing the solution with a time complexity of O(n^2). This lesson will help you approach similar problems that require sorting and searching techniques for efficient results.
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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]...