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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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6 challenges matching your filters

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  • Code AnalysisHard

    weak_ptr use_count check is racy

    cppsmart-pointersweak_ptrthread-safety
  • Multiple ChoiceBeginner

    weak_ptr lock pattern

    cppsmart-pointersweak_ptrthread-safety
  • Multiple ChoiceIntermediate

    shared_ptr thread safety scope

    cppsmart-pointersthread-safetyshared_ptr
  • Multiple ChoiceBeginner

    Function-local static init is thread-safe

    cppstatic-initthread-safetysingleton
  • Multiple ChoiceIntermediate

    Why the Meyers singleton is thread-safe

    singletonstatic-initthread-safety
  • Multiple ChoiceBeginner

    Function-Local Static Initialization Guard

    staticmagic-staticsthread-safety

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