4Sum Problem | LeetCode 18 | Optimal Approach (Sorting + Two Pointers) | C++ Explained
Автор: Your study friend
Загружено: 2026-02-28
Просмотров: 23
Описание:
In this video, we solve the famous 4Sum problem (LeetCode 18) using the optimal approach.
🔹 Problem: Find all unique quadruplets in the array that sum up to the target.
🔹 Approach Used: Sorting + Two Pointers
🔹 Time Complexity: O(n³)
🔹 Space Complexity: O(1) (excluding output)
We also discuss:
✔️ Why brute force (O(n⁴)) is not ideal
✔️ How to avoid duplicate quadruplets
✔️ How 4Sum extends the 3Sum pattern
💻 Language Used: C++
📌 Topic: Arrays, Two Pointer Technique
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