#15

3Sum

Medium
ArrayTwo PointersSorting

Given an integer array 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.

Examples

Example 1
Input: nums = [-1,0,1,2,-1,-4]
Output: [[-1,-1,2],[-1,0,1]]
nums[0] + nums[1] + nums[2] = (-1) + 0 + 1 = 0. nums[1] + nums[2] + nums[4] = 0 + 1 + (-1) = 0. nums[0] + nums[3] + nums[4] = (-1) + 2 + (-1) = 0. The distinct triplets are [-1,0,1] and [-1,-1,2].
Example 2
Input: nums = [0,1,1]
Output: []
Example 3
Input: nums = [0,0,0]
Output: [[0,0,0]]

Constraints

  • 3 <= nums.length <= 3000
  • -10^5 <= nums[i] <= 10^5
Code Editor