"""
Given an array nums of n integers, are there elements a, b, c in nums such that
a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.


Note:
    The solution set must not contain duplicate triplets.

Example:
    Given array nums = [-1, 0, 1, 2, -1, -4],

A solution set is:
    [
      [-1, 0, 1],
      [-1, -1, 2]
    ]
"""


"""
Given an array nums of n integers, are there elements a, b, c in nums such that
a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.


Note:
    The solution set must not contain duplicate triplets.

Example:
    Given array nums = [-1, 0, 1, 2, -1, -4],

A solution set is:
    [
      [-1, 0, 1],
      [-1, -1, 2]
    ]
"""


Given an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.   Note:     The solution set must not contain duplicate triplets.  Example:     Given array nums = [-1, 0, 1, 2, -1, -4],  A solution set is:     [       [-1, 0, 1],       [-1, -1, 2]     ]