solution.py

from typing import List


class Solution:
    def threeSum(self, nums: List[int]) -> List[List[int]]:
        nums.sort()
        output_list = []

        for i in range(len(nums)):
            if nums[i] > 0:
                break
            if i > 0 and nums[i] == nums[i - 1]:
                continue

            target = -nums[i]
            left, right = i + 1, len(nums) - 1
            while left < right:
                total = nums[left] + nums[right]
                if target == total:
                    output_list.append([nums[i], nums[left], nums[right]])
                    left += 1
                    while left < right and nums[left] == nums[left - 1]:
                        left += 1
                    while left < right and nums[right] == nums[right - 1]:
                        right -= 1
                elif target < total:
                    right -= 1
                else:
                    left += 1

        return output_list