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]
Explanation: Valid combinations are:2,3,4 (using the first 2)
2,3,4 (using the second 2)
Example 2:Input: nums = [4,2,3,4]
1 <= nums.length <=1000
0 <= nums[i] <=1000
Valid Triangle Number
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