15. 3Sum
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Given an arraySofnintegers, are there elementsa,b,cinSsuch thata+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)
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