Medium

Quiz

#611 Valid Triangle Number

APPROACH

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

1 of 4

What is the optimal approach for this problem?