Exploring Leetcode 18 4sum Two Pointers
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- 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?
- Rule: Given a list of integers and a target value, find all possible combinations of elements in the list that sum up to the target.
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a + b + c + d == target Core Idea: This problem is an extension of: 2Sum 3Sum We: Sort the array Fix first
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