Problems

Practice coding problems

Build problem-solving habits with topic filters, difficulty levels, visible examples, and an online code workspace.

Follow a guided ladder

Choose a Python Foundations, coding practice, or PCEP review path and work through problems in order.

View ladders

Difficulty

AllBeginnerIntermediateHard

Topic

All topicsArraysConditionalsDictionariesDynamic ProgrammingFunctionsGraphsGreedyHashmapInput/OutputListsLoopsPrefix SumsSimulationSortingStringsVariables

Showing 2 of 30 problems

Clear filters
IntermediateDictionaries

Project Tags

Given `n` project tags and one target tag, count how many times the target appears.

Open problem