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Hash Map Basics

Learn the most versatile data structure in programming: hash maps (dictionaries, objects). Master creation, lookup, counting, and grouping patterns that appear in nearly every coding problem.

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START: Word Frequency Count
Learn Hash Map BasicsExplanation, templates & reference

Word Frequency Count

easy10m

First Recurring Element

easy10m

Check Unique Characters

easy10m

Intersection of Two Arrays

easy15m

Ransom Note

easy10m

Majority Element

easy10m

Sort by Character Frequency

medium20m

Phone Number to Letters

medium20m

Isomorphic Mapping

medium15m

Subdomain Visit Count

medium20m