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Coding Challenges

5,893 curated questions across every arena — browse by topic, then jump into a live 3-minute battle to put them to the test.

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Code AnalysisBeginner
sizeof empty class
cppsizeofcode-analysis
Code AnalysisIntermediate
sizeof object with vptr
cppsizeofvtablecode-analysis
Multiple ChoiceBeginner
unique_ptr custom deleter size
cppsmart-pointersunique_ptrsizeof
Multiple ChoiceBeginner
sizeof with padding
cppalignmentsizeofpadding
Multiple ChoiceIntermediate
Member reordering changes sizeof
cppalignmentpaddingsizeof
Multiple ChoiceHard
Empty base optimization
cppsizeofempty-base-optimizationtemplates
Multiple ChoiceIntermediate
Member pointer size
cppsizeofpointer-to-memberabi

Practice now, dominate the arena

Every challenge here is drawn from the live Code Royale pool. Review a question, then head to the arena to answer under pressure against a real opponent — 3-minute matches, Elo ranking, and badge tiers on the line.

Coding Challenges

sizeof empty class

sizeof object with vptr

unique_ptr custom deleter size

sizeof with padding

Member reordering changes sizeof

Empty base optimization

Member pointer size

Practice now, dominate the arena