LeetCode 3Sum challenge Solution in JavaScript

In this video, the instructor presents a solution to the 3Sum challenge on LeetCode using Javascript. The problem statement and input/output requirements are explained in detail. The instructor then discusses the solution approach, which involves sorting the input array and using two pointers to find all unique triplets that sum to zero. The instructor demonstrates the implementation of the solution step-by-step, providing explanations and examples along the way. The importance of understanding the problem requirements and solution approach is emphasized, as well as the importance of considering edge cases and optimizing the solution. Overall, the video provides a clear and concise explanation of the problem and its solution, making it easy to follow along and understand.

1. Sort the input array in ascending order. This step ensures that duplicate triplets are not considered.

2. Initialize an empty array to store the result triplets.

3. Iterate over the array from the first to the second last element, treating each element as the potential first element of a triplet.

4. For each potential first element, use two pointers to find the remaining two elements that add up to the negative of the first element.

5. To find the remaining two elements, set two pointers: one pointing to the next element after the first element, and the other pointing to the last element of the array.

6. While the left pointer is less than the right pointer, check if the sum of the three elements is zero. If it is zero, append the triplet to the result array and move both pointers towards the center of the array.

7. If the sum is less than zero, move the left pointer towards the center of the array.

8. If the sum is greater than zero, move the right pointer towards the center of the array.

9. Continue iterating over the array, skipping over any duplicate elements, until the second last element is reached.

10. Return the result array.

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