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:
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Elements in a triplet (a,b,c) must be in non-descending order. (ie, a ≤ b ≤ c)
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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)
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