LeetCode #18: 4Sum — Solved in Java

Brute-Filtered Two-Pointer Scan and Early Exit Optimized with Long Bounds

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4Sum takes in an array of integers and asks you to find every set of four numbers that add up to a given target. You can use the same number more than once if it appears multiple times in the input, but each result has to be a unique combination. The order inside the array doesn’t matter, but repeated sets in the final list aren't allowed.

It…