611. Valid Triangle Number LeetCode Solution | Easy Approach

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Valid Triangle Number Given an integer array nums, return the number of triplets chosen from the array that can make triangles if we take them as side lengths of a triangle.

Example 1:

Input: nums = [2,2,3,4]
Output: 3
Explanation: Valid combinations are: 
2,3,4 (using the first 2)
2,3,4 (using the second 2)
2,2,3

Example 2:

Input: nums = [4,2,3,4]
Output: 4

Constraints:

  • 1 <= nums.length <= 1000
  • 0 <= nums[i] <= 1000

Valid Triangle Number Solutions

Time: O(n)
Space: O(n)

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