Solution: Valid Triangle Number
Explore the method to determine the number of valid triangle triplets in an integer array. Learn to apply sorting and two-pointer search techniques, using the triangle inequality rule, to identify all combinations that form valid triangles. This lesson helps develop skills in organizing data and implementing efficient search strategies for coding interview problems.
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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]...