Two-Sum Problem(s)
Series: Data Structures and Algorithms
Type: Subset Problems
DS: Arrays, Hashmaps, Sets, Two-Pointers
Code: Google Collab Notebook
Introduction
The Two-Sum problem is a common algorithmic challenge in which one must find a pair of numbers in an array that sums up a given target value. The question has many variations, and the difficulty is often based on the prompt's requirements.
In this page, I will try to collect variations and explain efficient solutions that optimize the spacetime complexity while discussing the benefits of the optimal approach vs. a brute-force one.
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This post is part of a series focused on teaching common Data Structure + Algorithm interview questions to SDEs.
The series will cover a broad range of questions from Easy-Hard difficulty and will have helpful interview tips throughout the posts.
The series will cover a broad range of questions from Easy-Hard difficulty and will have helpful interview tips throughout the posts.