Web Reference: Given an array nums of n integers, return an array of all the unique quadruplets [nums[a], nums[b], nums[c], nums[d]] such that: a, b, c, and d are distinct. You may return the answer in any order. Example 1: Output: [[-2,-1,1,2],[-2,0,0,2],[-1,0,0,1]] Example 2: Output: [[2,2,2,2]] Constraints: any solutions. No comments yet. In-depth solution and explanation for LeetCode 18. 4Sum in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. Before attempting this problem, you should be comfortable with: 1. Brute Force. The simplest approach is to try all possible combinations of four distinct elements and check if their sum equals the target. To avoid duplicate quadruplets, we first sort the array and use a set to store unique results.
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