Problem D

Given an integer array nums of possible sides lengths. Return the largest perimeter of the triangle that can be reached by combining these lengths. If there is no such a perimeter, return 0.

Example 1

Input: nums = [6, 3, 2, 3, 1, 9, 7]

Output: 22. Use lengths 6, 7 and 9.

Example 2

Input: nums = [4, 1, 5, 9]

Output: 0. There is no possible triangle, you can't use 4, 5, and 9, for example.

Example 3

Input: nums = [7, 15, 7, 7, 6]

Output: 21. Use 7, 7, 7.