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Coding Round 1 Mid-Level programming

LeetCode #15 - 3Sum

Given an array of integers, nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j != k, and nums[i] + nums[j] + nums[k] == 0. Notice that the solution set must not contain duplicate triplets.
Example 1:
Input: nums = [-1,0,1,2,-1,-4]
Output: [[-1,-1,2],[-1,0,1]]
Explanation: nums[0] + nums[1] + nums[2] == 0.
Example 2:
Input: nums = []
Output: []
Constraints:
0 <= nums.length <= 3000
-10^5 <= nums[i] <= 10^5
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