* [15] 3Sum * * 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] * ] * * */
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