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Three Sum

MediumArrays & Strings

Given an array of integers nums, find all unique triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, j != k, and nums[i] + nums[j] + nums[k] == 0. The solution must not contain duplicate triplets.

Example:

Input: nums = [-1,0,1,2,-1,-4]
Output: [[-1,-1,2],[-1,0,1]]
Explanation: 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,-1,2] and [-1,0,1].

Constraints:

  • 3 <= nums.length <= 3000
  • -10^5 <= nums[i] <= 10^5
  • The answer must not contain duplicate triplets