3Sum Problem Solution - The Coding Shala
In this post, we will learn how to solve the 3Sum Problem and will implement its solution in Java.
3Sum Java Solution
We can solve this problem using brute force but time complexity will go O(n^3) in that case. The brute force solution can be improved using Two pointer technique and the time complexity will be O(n^2). The steps are below for that:
Step 1. First, sort the array so we can use two pointer technique to figure out which side we need to move our pointer.
Step 2. Now we can solve this like 2 Sum problem.
To remove the duplicate pairs we need to check if two continuous elements are the same or not.
- Triplets with Sum between Given Range
- Two Sum Sorted Array
- Two Sum Problem
- Repeat and Missing Number Array
- Max Sum Contiguous SubArray