Web Reference: 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. 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. Jul 28, 2025 · Learn how to solve the 4Sum problem in Java using sorting, two pointers, and pruning for performance. Includes time and space complexity analysis.
YouTube Excerpt: Given an array nums of n integers and an integer target, are there elements a, b, c, and d in nums such that a + b + c + d = target?
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4sum Leetcode 18 Java Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
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Last Updated: April 8, 2026
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