三数之和为零问题
探讨了如何在一个整数数组中找到所有唯一且不重复的三元组，使得这三个数相加等于零。强调了解决方案需确保元素按非递减顺序排列且没有重复。
Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.
Note:
Elements in a triplet (a,b,c) must be in non-descending order. (ie, a ≤ b ≤ c)
The solution set must not contain duplicate triplets.
For example, given array S = {-1 0 1 2 -1 -4},
A solution set is:
(-1, 0, 1)
(-1, -1, 2)
blog.youkuaiyun.com/xiaobaohe/article/details/7857461
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