Solution: Valid Triangle Number
Explore how to determine the number of valid triangle triplets in an array by applying the sort and search pattern. This lesson teaches you to use sorting and two-pointer techniques to efficiently count combinations that satisfy the triangle inequality rule, helping you solve geometric coding problems confidently.
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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]...