Valid Triangle Number
Medium
Provided an integer array nums, produce 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 <= 10000 <= nums[i] <= 1000
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