3Sum

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.
Example
Given array S = {-1 0 1 2 -1 -4},
A solution set is:
(-1, 0, 1)
(-1, -1, 2)

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