The LeetCode Beginner's Guide

383. Ransom Note

This problem will introduce you to the hash map (or dictionary) data structure, which is necessary to understand well for future problems. If you are not familiar with the hash map data structure, do not worry, you can always skip this problem, but we encourage you to try to solve 383. Ransom Note on your own. If you feel stuck, check out the solution article for the problem or come back here to view the video solution. The Explore Card Track (in chapter 3 of this guide) will also guide you through the necessary material you need to understand this data structure well!