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Dictionaries coding challenges

Practise dictionaries with 3 coding challenges, from easy to hard. Every challenge runs in your browser with instant tests, an AI review of your code and community solutions to compare.

Easy · 2 Medium · 1

Skills you'll practise: CountingAggregating resultsFrequency tablesHash mapsSorting with keys
  • Python · C++ · C#
  • Automated tests
  • AI code review
  • Community solutions
Programming
Programming fundamentalsFrom variables to recursion, for beginners
AI and machine learning
AI Learning HubNeural networks, ML and LLMs from scratch Neural networks from scratchNeurons, backpropagation and optimizers Machine learning from scratchRegression, classification and clustering Transformers and LLMs from scratchTokenizers, attention and text generation Classical AI and reinforcement learningSearch, games and reinforcement learning
226
Challenges
2
Solutions shared
3
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3 challenges
Medium

Tournament Standings

Rank teams from match records.

You'll learn Aggregating resultsSorting with keys
DictionariesParsingSorting
Python C++ C#
0 solved
No solutions yet
Easy

Character Frequency

Count how often each character appears.

You'll learn Frequency tablesCounting
BeginnerDictionariesStringsStudent-beginner
Python C++ C#
0 solved
No solutions yet
Easy

First Unique Character

Find the first character that appears only once.

You'll learn Hash mapsCounting
BeginnerDictionariesStringsStudent-beginner
Python C++ C#
0 solved
No solutions yet

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