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step_henny
Last logged in 8/9/2026

Activity

Attempted questions, problems, quizzes, and roadmap resources in 2026

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Rank
Principal
Tier 6 of 11
Total XP
247,056
Staff rank badgeStaff
Distinguished rank badgeDistinguished
2,944 XP to Distinguished98%
Questions
403
Solved
Problems
36
Solved
Quizzes
0
Completed
Awards
0
Received
Streak
16
Days
Best Streak
16
Days

Recently Completed

TitleStatusDate
2s Complement Practice
CookedDigitalDesign
8/15/2026
Hexadecimal Notation Practice
CookedDigitalDesign
8/15/2026
CImplement a Hash Map 1
MediumLanguageKnowledge14.3ms
8/15/2026
CImplement LRU Cache
MediumLanguageKnowledge10.7ms
8/14/2026
CImplement a Ring Buffer
MediumLanguageKnowledge8.6ms
8/13/2026
CUnderstanding arrays
MediumLanguageKnowledge
8/10/2026
CSo, how big is vector?
MediumLanguageKnowledge
8/10/2026
CImplement decorator
EasyDesignPatterns18.8ms
8/8/2026
CImplement abstract factory
CookedDesignPatterns4.0ms
8/8/2026
CDouble flushing?
CookedLanguageKnowledge
8/7/2026
CDab up the DAG
HardLanguageKnowledge5.4ms
8/5/2026
CHe fumbled the [] operator.
EasyLanguageKnowledge
8/4/2026
CConflating a Queue
EasyLanguageKnowledge5.6ms
8/4/2026
CImplement vector
MediumLanguageKnowledge7.7ms
8/3/2026
CImplement mutex
MediumConcurrency555.6ms
8/3/2026
CHow do I test ts 1?
MediumConcurrency
8/2/2026
CTrue-sharing data structure
EasyConcurrency2.0ms
8/2/2026
CDistributed System Task Schedule Reconciliation
HardLanguageKnowledge10.3ms
8/1/2026
CVector growth 1
EasyLanguageKnowledge
7/26/2026
CA, B, C, initializer_list
EasyLanguageKnowledge
7/26/2026
C3D Arrays
EasyLanguageKnowledge
7/26/2026
CVector growth 2
CookedLanguageKnowledge
7/26/2026
CVector construction
CookedLanguageKnowledge
7/26/2026
CIndexing arrays
CookedLanguageKnowledge
7/26/2026
CHow does it allocate?
CookedLanguageKnowledge
7/26/2026
CKeep your cool, keep it constant.
EasyLanguageKnowledge
7/26/2026
CIs it const?
EasyLanguageKnowledge
7/26/2026
Ccontainers and constexprs
EasyLanguageKnowledge
7/26/2026
CLook it up, buddy.
EasyLanguageKnowledge
7/26/2026
CI'm singleton.
CookedDesignPatterns4.2ms
7/24/2026
CNullify
CookedDesignPatterns8.0ms
7/24/2026
CInconsistent arguments.
MediumLanguageKnowledge
7/24/2026
CRemoving the polymorphic
MediumLanguageKnowledge
7/24/2026
COnly these can do this.
MediumLanguageKnowledge
7/22/2026
CMore constants more problems.
MediumLanguageKnowledge
7/22/2026
CTemplate sum 2
EasyLanguageKnowledge
7/22/2026
CTemplate Specializations 3
EasyLanguageKnowledge
7/22/2026
Cauto&& T&& <T>&&
EasyLanguageKnowledge
7/22/2026
CCTAD
CookedLanguageKnowledge
7/22/2026
CIf Else... What?
MediumLanguageKnowledge
7/21/2026
COver here, then over there.
HardLanguageKnowledge
7/21/2026
Cstructs of structs of structs 3
MediumLanguageKnowledge
7/21/2026
CToo many question(mark)s
MediumLanguageKnowledge
7/21/2026
CStreams
MediumLanguageKnowledge
7/21/2026
Cprint function?
MediumLanguageKnowledge
7/21/2026
CInvoke me.
EasyLanguageKnowledge
7/21/2026
CComparing your variants
MediumLanguageKnowledge
7/21/2026
CSo close to unwinding.
CrackedLanguageKnowledge
7/21/2026
C? 1 : 2 -> auto
HardLanguageKnowledge
7/20/2026
CLambda defaults
EasyLanguageKnowledge
7/20/2026
CExit the function early.
MediumLanguageKnowledge
7/20/2026
CCall it, improved.
CookedLanguageKnowledge
7/20/2026
Sharing is caring.
CookedComputerArchitecture
7/19/2026
Instruction Set Architecture
MediumComputerArchitecture
7/19/2026
Common ISAs
CookedComputerArchitecture
7/19/2026
ISA Components
EasyComputerArchitecture
7/19/2026
Which-Way Associativity?
EasyComputerArchitecture
7/19/2026
How big are the lines?
CookedComputerArchitecture
7/19/2026
Tag, you're it.
EasyComputerArchitecture
7/19/2026
How big is it?
EasyComputerArchitecture
7/19/2026
What is a Software Thread?
CookedOperatingSystems
7/19/2026
Interacting with the OS
CookedOperatingSystems
7/19/2026
System vs Procedure Call
CookedOperatingSystems
7/19/2026
ARP Cache Clear
CookedNetworking
7/19/2026
IPv6 ARP?
EasyNetworking
7/19/2026
IPv4 vs IPv6 Headers
EasyNetworking
7/19/2026
Why even IP?
CookedNetworking
7/19/2026
DS, but not Nintendo.
EasyNetworking
7/19/2026
You're too big!
CookedNetworking
7/19/2026
IP Forwarding
CookedNetworking
7/19/2026
IPv6 Flow Label
CookedNetworking
7/19/2026
IPv4 vs IPv6 Fragmentation
HardNetworking
7/19/2026
Broadcast vs Multicast
CookedNetworking
7/19/2026
Broadcast Address Types
MediumNetworking
7/19/2026
Limited Broadcast Usage
EasyNetworking
7/19/2026
Multicast Address Range
EasyNetworking
7/19/2026
Multicast MAC Conversion
EasyNetworking
7/19/2026
CHey, catch!
MediumLanguageKnowledge
7/19/2026
CException safety guarantees
MediumLanguageKnowledge
7/19/2026
CSequential guarantees
EasyConcurrency
7/19/2026
Broadcast Reception Control
MediumNetworking
7/17/2026
Broadcast Forwarding Behavior
EasyNetworking
7/17/2026
DNS Basic Function
CookedNetworking
7/17/2026
DNS Namespace Structure
CookedNetworking
7/17/2026
DNS Zones Purpose
EasyNetworking
7/17/2026
DNS Caching Benefits
CookedNetworking
7/17/2026
TCP Service Model
CookedNetworking
7/17/2026
TCP Sequence Numbers
CookedNetworking
7/17/2026
TCP Reliability Mechanism
CookedNetworking
7/17/2026
TCP Checksum Coverage
EasyNetworking
7/17/2026
TCP Three-way Handshake
CookedNetworking
7/17/2026
TCP TIME_WAIT Purpose
EasyNetworking
7/17/2026
TCP Window Scale Option
EasyNetworking
7/17/2026
TCP RTO Calculation
CookedNetworking
7/17/2026
CConst crashout 1
EasyLanguageKnowledge
7/17/2026
CCatching noexcept Method
EasyLanguageKnowledge
7/17/2026
Cr-value confusion.
HardLanguageKnowledge
7/17/2026
CI don't get the pun.
MediumLanguageKnowledge
7/17/2026
CStop! Don’t move!
EasyLanguageKnowledge
7/17/2026
CMoved from.
EasyLanguageKnowledge
7/17/2026
CMove!
EasyLanguageKnowledge
7/17/2026
CIs it constructible?
CrackedLanguageKnowledge10.6ms
7/17/2026
CImplement std::any
CrackedLanguageKnowledge13.6ms
7/17/2026
C96% of you will fail this.
HardLanguageKnowledge
7/17/2026
CThrow me out.
HardLanguageKnowledge
7/17/2026
C-dont-elide-me
HardLanguageKnowledge
7/17/2026
CStorage Duration
EasyLanguageKnowledge
7/16/2026
CInitialization order.
MediumLanguageKnowledge
7/16/2026
CException in my constructor
MediumLanguageKnowledge
7/16/2026
CCopy constructor, maybe.
MediumLanguageKnowledge
7/16/2026
CConstructing it, with it.
EasyLanguageKnowledge
7/15/2026
CAuto with Braced Initializers
CookedLanguageKnowledge
7/15/2026
C3D Space
CookedLanguageKnowledge3.2ms
7/15/2026
CSimple Pointer Math
MediumLanguageKnowledge
7/15/2026
CI'm leaking bytes!
MediumLanguageKnowledge
7/15/2026
CEast to West
MediumLanguageKnowledge
7/15/2026
CChop Chop Chop
MediumLanguageKnowledge
7/15/2026
CCastaway
MediumLanguageKnowledge
7/15/2026
CWhat's the point?
EasyLanguageKnowledge
7/15/2026
Cdelete it.
EasyLanguageKnowledge
7/15/2026
CThe headers you never knew
CookedLanguageKnowledge
7/15/2026
CDelete Delete Delete
CookedDesignPatterns
7/15/2026
CImplement make_unique
MediumLanguageKnowledge1.2ms
7/15/2026
CImplement unique_ptr
EasyLanguageKnowledge7.5ms
7/14/2026
CWho comes first?
MediumLanguageKnowledge
7/14/2026
Cvirtual <<
EasyLanguageKnowledge
7/14/2026
CReworking hierarchies to compile-time.
MediumDesignPatterns3.4ms
7/14/2026
TCP Flow Control
EasyNetworking
7/12/2026
So, what's a TCP SACK?
EasyNetworking
7/12/2026
Same line, different time.
CookedConcurrency
7/12/2026
TCP Fast Retransmit
CookedNetworking
7/12/2026
TCP Packet Reordering
EasyNetworking
7/12/2026
TCP Flow Control Purpose
EasyNetworking
7/12/2026
TCP Sliding Window
EasyNetworking
7/12/2026
Nagle Algorithm Purpose
CookedNetworking
7/12/2026
Delayed Acknowledgments
MediumNetworking
7/12/2026
Silly Window Syndrome
EasyNetworking
7/12/2026
TCP Congestion Detection
EasyNetworking
7/12/2026
Thinking of memory strategically
CookedOperatingSystems
7/12/2026
Page Table Present Bit
CookedOperatingSystems
7/11/2026
Swap Space Function
CookedOperatingSystems
7/11/2026
LRU Replacement Policy
CookedOperatingSystems
7/11/2026
More data more problems
CookedOperatingSystems
7/11/2026
What am I using to lock this?
EasyOperatingSystems
7/11/2026
Counter Thread Safety
CookedOperatingSystems
7/10/2026
Scalable Counter Design
EasyOperatingSystems
7/10/2026
Lock Coupling
EasyOperatingSystems
7/10/2026
Condition Variable Purpose
CookedOperatingSystems
7/10/2026
Condition Variable Atomicity
CookedOperatingSystems
7/10/2026
Producer-Consumer Signaling
EasyOperatingSystems
7/10/2026
Signal vs Broadcast
CookedOperatingSystems
7/10/2026
Semaphore Basic Definition
CookedOperatingSystems
7/10/2026
Thread Pool Benefits
EasyConcurrency
7/10/2026
TCP Termination Process
CookedNetworking
7/10/2026
Fast Random
EasyOperatingSystems
7/10/2026
Private to Public
CookedNetworking
7/10/2026
Lock It
MediumOperatingSystems
7/10/2026
NAT or ...
EasyNetworking
7/10/2026
Underlying Protocols
EasyNetworking
7/10/2026
OS OSI
CookedNetworking
7/10/2026
Open Close Open Close
EasyNetworking
7/10/2026
IEEEEEEEEEE
HardComputerArchitecture
7/10/2026
Where can I find you?
EasyOperatingSystems
7/10/2026
The number of fragments
MediumNetworking
7/10/2026
The bare minimum
MediumNetworking
7/10/2026
random_insert
CookedLanguageKnowledge
7/10/2026
CStatic* and Dynamic*
MediumLanguageKnowledge
7/10/2026
CIt's weak, but how big is it?
MediumLanguageKnowledge
7/9/2026
CShared pointer constructor
EasyLanguageKnowledge
7/9/2026
CDefault shared pointer
EasyLanguageKnowledge
7/9/2026
CHow big is a pointer?
CookedLanguageKnowledge
7/9/2026
CIn a Diamond
EasyLanguageKnowledge
7/9/2026
CEven One Virtual Method
EasyLanguageKnowledge
7/9/2026
CAdding const, virtually?
EasyLanguageKnowledge
7/9/2026
CAdding const, overrid-ially.
EasyLanguageKnowledge
7/9/2026
CHerb's Destructor
CookedLanguageKnowledge
7/9/2026
CI’m empty inside 1.
MediumLanguageKnowledge
7/9/2026
CIt's a simple struct.
EasyLanguageKnowledge
7/9/2026
CEmpty Structs
EasyLanguageKnowledge
7/9/2026
Reinventing the cat
EasyNetworking
7/9/2026
Lions and buffalos
EasyLanguageKnowledge
7/9/2026
How much did I win?
EasyPuzzles
7/9/2026
Are we in St. Petersburg?
CookedProbabilityStatistics
7/9/2026
CAddress Translation 3
MediumOperatingSystems10.1ms
7/9/2026
CI get along with the locals.
EasyLanguageKnowledge
7/7/2026
C3 exits
EasyLanguageKnowledge
7/7/2026
CLet's link up.
EasyLanguageKnowledge
7/7/2026
CSpuriously failed...
EasyConcurrency
7/7/2026
CRelaxing in the midst of synchronizing.
EasyConcurrency
7/7/2026
CContainers for containers.
EasyLanguageKnowledge
7/7/2026
CFreedom?
EasyLanguageKnowledge
7/7/2026
CSOO, about that object.
EasyLanguageKnowledge
7/7/2026
CString placement
EasyLanguageKnowledge
7/7/2026
CHave him play with it.
EasyLanguageKnowledge
7/7/2026
Cskibidi pointer
EasyLanguageKnowledge
7/7/2026
Cstructs of structs of structs 2
EasyLanguageKnowledge
7/7/2026
Cstructs of structs of structs
EasyLanguageKnowledge
7/7/2026
Coverride!
EasyLanguageKnowledge
7/7/2026
CTrust me, I'm Async
MediumConcurrency
7/7/2026
Page Fault Mechanism
CookedOperatingSystems
7/7/2026
Multi-level Page Tables
EasyOperatingSystems
7/4/2026
CWho are you pointing to?
CookedLanguageKnowledge
7/4/2026
CAddress Translation 2
MediumComputerArchitecture13.9ms
7/2/2026
CI don't give a flying float
MediumLanguageKnowledge
7/1/2026
CWhatever floats your cope.
EasyLanguageKnowledge
7/1/2026
CFloating points, you sure?
CookedLanguageKnowledge
7/1/2026
CAddress Translation 1
EasyComputerArchitecture9.2ms
7/1/2026
The Page Replacement Algorithm
CookedOperatingSystems
6/30/2026
CI'm leaking bytes! 2
EasyOperatingSystems
6/30/2026
Shake it, shake, shake it.
CookedOperatingSystems
6/30/2026
PML4
EasyOperatingSystems
6/30/2026
PML?
HardOperatingSystems
6/30/2026
What the fork?
CookedOperatingSystems
6/30/2026
isolcpu, taskset, pthread_setaffinity.
CookedOperatingSystems
6/30/2026
PythonThe whole shebang
MediumOperatingSystems
6/30/2026
IPC mutex
EasyOperatingSystems
6/30/2026
System Initialization
CookedOperatingSystems
6/30/2026
Return from where?
EasyOperatingSystems
6/30/2026
C____ Park
MediumLanguageKnowledge
6/30/2026
CWhat's statically wrong?
MediumLanguageKnowledge
6/30/2026
Cconst char* mission
MediumLanguageKnowledge
6/30/2026
CLets 8x the stride.
EasyLanguageKnowledge
6/30/2026
CI only speak english
MediumLanguageKnowledge
6/30/2026
CAnother string question?
MediumLanguageKnowledge
6/30/2026
CI thought I understood this.
CookedLanguageKnowledge
6/30/2026
Cconstexpr if
MediumLanguageKnowledge
6/30/2026
C fp compatibility
EasyLanguageKnowledge
6/29/2026
CI'm printing mom...
MediumLanguageKnowledge
6/29/2026
CDynamic is powerful 1
MediumLanguageKnowledge
6/29/2026
CHidden calories
MediumLanguageKnowledge
6/29/2026
TLB Purpose
CookedOperatingSystems
6/29/2026
The fundemental page
CookedOperatingSystems
6/29/2026
CImplement an allocator
MediumOperatingSystems7.2ms
6/29/2026
CCustom deleter magic?
EasyLanguageKnowledge
6/28/2026
CGoing global
MediumLanguageKnowledge
6/28/2026
CWhich kind of vector?
EasyLanguageKnowledge
6/28/2026
CCan you list what's initialized?
EasyLanguageKnowledge
6/28/2026
CZero Division, Error Error?
EasyLanguageKnowledge
6/28/2026
CMinus 0
EasyLanguageKnowledge
6/28/2026
It's magic.
EasyOperatingSystems
6/27/2026
Dealing with Fragmentation
EasyOperatingSystems
6/27/2026
Buddy Allocation System
EasyOperatingSystems
6/27/2026
CBase and Many Bounds
EasyOperatingSystems18.9ms
6/26/2026
Fragmentation 1
EasyOperatingSystems
6/25/2026
Memory Segmentation
CookedOperatingSystems
6/25/2026
Base my bounds
CookedOperatingSystems
6/25/2026
Weighing Jobs
EasyOperatingSystems
6/25/2026
Linux, what are you using?
CookedOperatingSystems
6/25/2026
How are jobs stored?
CookedOperatingSystems
6/25/2026
CScheduling in Strides!
MediumOperatingSystems7.8ms
6/25/2026
Pay your fair share.
CookedOperatingSystems
6/25/2026
Ding ding ding!
CookedOperatingSystems
6/25/2026
Simple system call overhead
MediumOperatingSystems
6/25/2026
Job Scheduling
EasyOperatingSystems
6/25/2026
Uncontrolled scheduling
CookedOperatingSystems
6/25/2026
P switch T switch.
CookedOperatingSystems
6/25/2026
Translate which address?
CookedOperatingSystems
6/24/2026
CAmpersand
CookedOperatingSystems
6/24/2026
CThat's BS!
MediumOperatingSystems
6/24/2026
Top of the stack
EasyOperatingSystems
6/24/2026
CThey're stacked.
EasyOperatingSystems
6/24/2026
CKcats
EasyOperatingSystems
6/24/2026
Before main()
EasyOperatingSystems
6/24/2026
After main()
CookedOperatingSystems
6/24/2026
Split segments
CookedOperatingSystems
6/24/2026
CAm I missing something?
HardLanguageKnowledge
6/23/2026
COverloading lambdas!
EasyLanguageKnowledge
6/23/2026
CBetween two parts.
EasyLanguageKnowledge
6/23/2026
CI am the shadows.
EasyLanguageKnowledge
6/23/2026
Lock Free vs Wait Free
EasyConcurrency
6/23/2026
ABA Problem in Lock-free Code
CookedConcurrency
6/23/2026
CWrite-supremacy concurrent data structure.
HardConcurrency1003.8ms
6/23/2026
CImplement Lock-Free SPSC Queue
MediumConcurrency7.9ms
6/21/2026
Lock-free Memory Management
EasyConcurrency
6/21/2026
CImplement std::jthread
HardConcurrency77.2ms
6/21/2026
But how do it do?
CookedOperatingSystems
6/20/2026
Why an OS?
EasyOperatingSystems
6/20/2026
Interrupting an interrupt.
EasyOperatingSystems
6/20/2026
CParallel tracks
MediumConcurrency503.8ms
6/20/2026
Workload Distribution
EasyConcurrency
6/20/2026
CTell me the time
MediumLanguageKnowledge
6/20/2026
Registering RAM
CookedComputerArchitecture
6/20/2026
Memory Addressing Modes
CookedComputerArchitecture
6/20/2026
Pipeline Operation Basics
EasyComputerArchitecture
6/20/2026
Pipelining Performance Benefits
CookedComputerArchitecture
6/20/2026
Branch Instruction Types
CookedComputerArchitecture
6/20/2026
Space the cache
EasyComputerArchitecture
6/20/2026
Single-Cycle Processor Limitations
CookedComputerArchitecture
6/20/2026
Map the cache, again
MediumComputerArchitecture
6/20/2026
CYour (GHR) size matters
MediumComputerArchitecture
6/20/2026
CImplement thread pool
MediumConcurrency81.2ms
6/20/2026
CHow many kids do I want?
CookedConcurrency
6/20/2026
CPeas in a pod.
EasyConcurrency
6/19/2026
Cache Coherence Optimization
CookedConcurrency
6/19/2026
Amdahl's Law Application
CookedConcurrency
6/19/2026
CImplement stop_token
EasyConcurrency11.9ms
6/19/2026
CWhat pointer?
EasyConcurrency
6/19/2026
CMemory order I
EasyConcurrency
6/19/2026
CAre they always like this?
EasyConcurrency
6/17/2026
CUnsigned - Unsigned
MediumLanguageKnowledge
6/16/2026
CUnderstand lambdas, understand C++.
EasyLanguageKnowledge
6/16/2026
CSatisfy me!
EasyLanguageKnowledge
6/16/2026
C_global_variable
HardLanguageKnowledge
6/16/2026
CThe designated representative.
MediumLanguageKnowledge
6/16/2026
CSchrödinger's Initializer
MediumLanguageKnowledge
6/16/2026
CForgot one?
EasyLanguageKnowledge
6/16/2026
CC++ is a…
EasyLanguageKnowledge
6/16/2026
Cross-thread Exception Handling
EasyConcurrency
6/16/2026
CAsync surprise party
EasyConcurrency
6/16/2026
CImplement shared_ptr
MediumLanguageKnowledge9.9ms
6/16/2026
CWait, I'm sleeping
EasyConcurrency
6/14/2026
A onephore
CookedConcurrency
6/14/2026
CImplement Reader-Writer Lock
HardConcurrency409.9ms
6/14/2026
How fine is the grain?
EasyConcurrency
6/13/2026
CImplement SPSC Queue
EasyConcurrency55.6ms
6/13/2026
EEEEEEEEEEI
MediumComputerArchitecture
6/8/2026
CHow many copies?
CrackedComputerArchitecture
6/8/2026
CShifting off the edge
CookedComputerArchitecture
6/7/2026
Ca + b + c
CookedComputerArchitecture
6/7/2026
Cache me if you can!
MediumComputerArchitecture
6/7/2026
Cache me if you can! 2
MediumComputerArchitecture
6/7/2026
Cache me if you can! 3
EasyComputerArchitecture
6/7/2026
Speedup again
EasyComputerArchitecture
6/7/2026
Speedup
MediumComputerArchitecture
6/7/2026
CGet it for me quick!
EasyComputerArchitecture
6/7/2026
X Indexed Y Tagged 1
EasyComputerArchitecture
6/7/2026
X Indexed Y Tagged 2
EasyComputerArchitecture
6/7/2026
X Indexed Y Tagged 3
EasyComputerArchitecture
6/7/2026
Process Control Block
EasyOperatingSystems
6/7/2026
Process States
CookedOperatingSystems
6/7/2026
Clean up the thread
CookedOperatingSystems
6/7/2026
Join me
CookedOperatingSystems
6/7/2026
A thread-safe stack.
EasyConcurrency
6/7/2026
Locking Granularity Tradeoffs
EasyConcurrency
6/7/2026
CLocked up, they won't let me out.
EasyConcurrency
6/7/2026
Accumulate it all in parallel.
EasyConcurrency
6/7/2026
CParallel pitfalls
EasyConcurrency
6/7/2026
No progress.
EasyConcurrency
6/7/2026
Spin what lock?
CookedConcurrency
6/7/2026
CHey, I'm waiting to be unlocked.
EasyConcurrency
6/7/2026
CYou're not part of our group.
MediumConcurrency
3/7/2026
What am I guarding?
CookedConcurrency
3/6/2026
CBypass the mutex, or not?
EasyConcurrency
3/6/2026
How does it mutex?
MediumConcurrency
3/6/2026
When are we racing, and what is the condition?
EasyConcurrency
3/6/2026
Sharing data the nice way.
CookedConcurrency
3/6/2026
CI really want to be with you.
MediumConcurrency
3/6/2026
CTransferring ownership.
EasyConcurrency
3/6/2026
CWhat's suspect?
EasyConcurrency
3/6/2026
Joined together.
EasyConcurrency
3/6/2026
2 Types of Parallelism
EasyConcurrency
3/6/2026
CInspector Gadget
MediumLanguageKnowledge
1/4/2026
CA, B, C, harder than 1, 2, 3
MediumLanguageKnowledge
1/4/2026
CConstipated constexpr
EasyLanguageKnowledge
1/4/2026
CYou don't always matter to me
EasyLanguageKnowledge
1/4/2026
CArray extensioooooons
MediumLanguageKnowledge
1/4/2026
CI'm empty inside 4
EasyLanguageKnowledge
1/4/2026
CI'm empty inside 3
MediumLanguageKnowledge
1/4/2026
CI'm empty inside 2
CookedLanguageKnowledge
1/4/2026
Cstd::cout vs std::cerr
EasyLanguageKnowledge
1/4/2026
CWe're stronger together.
EasyLanguageKnowledge840.7ms
1/4/2026
CPoints and boundaries!
EasyLanguageKnowledge54.9ms
1/4/2026
CWho lives here?
HardLanguageKnowledge
12/31/2025
CBodyguard
EasyLanguageKnowledge
12/31/2025
CMoney laundering 2
MediumLanguageKnowledge
12/31/2025
CMoney laundering 1
MediumLanguageKnowledge
12/31/2025
CTear it out root and stem
MediumLanguageKnowledge
12/31/2025
CAre you pessimistic?
EasyLanguageKnowledge
12/31/2025
CThe perfect union 3.
EasyLanguageKnowledge
12/31/2025
CParse a farce.
MediumLanguageKnowledge
12/31/2025
COne after the other
MediumLanguageKnowledge
12/31/2025
C2 variables 1 auto
MediumLanguageKnowledge
12/31/2025
Cmemset() on objects.
EasyLanguageKnowledge
12/31/2025
CPut it right there
HardLanguageKnowledge
12/31/2025
CA tale of two pointers!
EasyLanguageKnowledge
12/31/2025
CClass inStruction
EasyLanguageKnowledge
12/31/2025
CCase and point 1
EasyLanguageKnowledge
12/31/2025
CCase and point 2
EasyLanguageKnowledge
12/31/2025
CSpin wars
EasyConcurrency
12/31/2025
CUnder the Shadow
HardLanguageKnowledge
10/17/2025
C++i ++i
EasyLanguageKnowledge
10/17/2025
Cwhat??!|
HardLanguageKnowledge
10/17/2025
CTo <T> or not to <T>
EasyLanguageKnowledge
10/17/2025
CI hate decltype
CookedLanguageKnowledge
10/17/2025
Pythonleft or right?
HardLanguageKnowledge
10/17/2025
PythonFooor!
EasyLanguageKnowledge
10/17/2025
CEven if nothing!
EasyLanguageKnowledge
10/17/2025
Cis_lock_free()
EasyLanguageKnowledge
10/17/2025
C___ is to size_t
EasyLanguageKnowledge
10/17/2025
Pythonarrrrg
MediumLanguageKnowledge
10/17/2025
Cache Inclusion
CookedComputerArchitecture
10/17/2025
Multicast Group Membership
CookedNetworking
10/16/2025
So, what's UDP?
EasyNetworking
10/16/2025
Whichcast
CookedNetworking
10/16/2025
Multicast Addressing
EasyNetworking
10/16/2025
CCatch me if you can!
EasyLanguageKnowledge
10/16/2025
CNah, we’re not moving.
MediumLanguageKnowledge
10/16/2025
CTemplatey signatures.
EasyLanguageKnowledge
10/16/2025
CWe're virtually there.
MediumLanguageKnowledge
10/16/2025
CConstructing it.
EasyLanguageKnowledge
10/16/2025
CA very small value
HardLanguageKnowledge
10/16/2025
CStatic Shenanigans
EasyLanguageKnowledge
10/16/2025
CSigned Integer Overflow
EasyLanguageKnowledge
10/16/2025
CZero Division, Error?
EasyLanguageKnowledge
10/16/2025
CTo delete or not to delete
EasyLanguageKnowledge
10/16/2025
CNot this, again.
EasyLanguageKnowledge
10/16/2025
CTo sign or not to sign?
EasyLanguageKnowledge
10/16/2025
CI like to share my pointer.
EasyLanguageKnowledge
10/16/2025
CChar + Char
EasyLanguageKnowledge
10/16/2025
CYou don't understand strings.
MediumLanguageKnowledge
10/16/2025
Cauto... &?
EasyLanguageKnowledge
10/16/2025
CIs it used?
EasyLanguageKnowledge
10/16/2025
CThe const or the ?
MediumLanguageKnowledge
10/16/2025
CTransfering namespaces
EasyLanguageKnowledge
10/16/2025
CAuto Type Deduction Rules
EasyLanguageKnowledge
10/16/2025
CVirtually a template.
EasyLanguageKnowledge
10/16/2025
CWhere do we go now?
MediumLanguageKnowledge
10/16/2025
CArray, Array, go away, come again another day.
MediumLanguageKnowledge
10/16/2025
CLet's go the other way.
MediumLanguageKnowledge
10/16/2025
COnce or twice?
CookedLanguageKnowledge
10/16/2025
Cr-expression
MediumLanguageKnowledge
10/16/2025
CThe perfect union 2.
MediumLanguageKnowledge
10/16/2025
ISA Instructions
EasyComputerArchitecture
10/15/2025
TLB Switch
EasyComputerArchitecture
10/15/2025
NUMA NUMA NUMA
CookedComputerArchitecture
10/15/2025
CBimodal prediction.
EasyComputerArchitecture
10/15/2025
L1 Cache Split
CookedComputerArchitecture
10/15/2025
3 Cache Misses
CookedComputerArchitecture
10/15/2025
RAM to Cache Memory Transport
CookedComputerArchitecture
10/15/2025
How much parallelism?
EasyComputerArchitecture
10/15/2025
Pipeline Performance Calculation
CookedComputerArchitecture
10/15/2025
Memory Address Translations
EasyComputerArchitecture
10/15/2025
What 'E'?
EasyComputerArchitecture
10/15/2025
It's massive.
EasyComputerArchitecture
10/15/2025
CBimodal prediction II
HardComputerArchitecture
10/15/2025
PythonLEGB!
MediumLanguageKnowledge
10/15/2025
PythonZero Division Error
MediumLanguageKnowledge
10/15/2025
Python__main__
MediumLanguageKnowledge
10/15/2025
PythonDis Me
EasyLanguageKnowledge
10/15/2025
PythonLogical Deduction?
MediumLanguageKnowledge
10/15/2025
PythonSo, where is 1,000 stored?
CookedLanguageKnowledge
10/15/2025
PythonLet's golf!
MediumLanguageKnowledge
10/15/2025
PythonMaximal Snake
EasyLanguageKnowledge
10/15/2025
PythonZip it 2
EasyLanguageKnowledge
10/15/2025
PythonGet truthed.
EasyLanguageKnowledge
10/15/2025
PythonString Interpolation Shenanigans
HardLanguageKnowledge
10/15/2025
PythonDifficulty enumerations.
EasyLanguageKnowledge
10/15/2025
PythonMangled up.
EasyLanguageKnowledge
10/15/2025
PythonLiving by Proxy
EasyLanguageKnowledge
10/15/2025
PythonDependable developers?
MediumLanguageKnowledge
10/15/2025
PythonScope the Scope 2
EasyLanguageKnowledge
10/15/2025
PythonInquisitive Inheritance 2
MediumLanguageKnowledge
10/15/2025
PythonDefault Arguments
EasyLanguageKnowledge
10/15/2025
PythonWhere's my path?
HardLanguageKnowledge
10/15/2025
PythonMake it pretty.
CookedLanguageKnowledge
10/15/2025
PythonZip it 4
EasyLanguageKnowledge
10/15/2025
Pythonget ref
MediumLanguageKnowledge
10/15/2025
PythonThe Loop's Last Laugh
HardLanguageKnowledge
10/15/2025
PythonWhich one should I choose?
MediumLanguageKnowledge
10/15/2025
CHaha…
MediumLanguageKnowledge
10/14/2025
CChanging Const?
CookedLanguageKnowledge
10/14/2025
CObserve Closely
MediumLanguageKnowledge
10/14/2025
CHow Much More New?
EasyLanguageKnowledge
10/14/2025
CYou're still not real.
MediumLanguageKnowledge
10/14/2025
CHow'd you read this?
EasyLanguageKnowledge
10/14/2025
CNot too deep
MediumLanguageKnowledge
10/14/2025
COne of these mains.
EasyLanguageKnowledge
10/14/2025
Cas-if I'd ever let you.
EasyLanguageKnowledge
10/14/2025
CGG
MediumLanguageKnowledge
10/14/2025
C#Pragma Roll
EasyLanguageKnowledge
10/14/2025
CI really really hate decltype
MediumLanguageKnowledge
10/14/2025
CDown shift
MediumLanguageKnowledge
10/14/2025
CIt's unique, but is it big?
CookedLanguageKnowledge
10/14/2025
CErase it.
EasyLanguageKnowledge
10/14/2025
CThe perfect union.
MediumLanguageKnowledge
10/14/2025
CIf you've used templates, you've run into this.
EasyLanguageKnowledge
10/14/2025
C.template
EasyLanguageKnowledge
10/14/2025
CSpecialize me.
MediumLanguageKnowledge
10/14/2025
Speak the language.
CookedOperatingSystems
10/14/2025
It's our time!
EasyOperatingSystems
10/14/2025
You Dirty Bit.
CookedOperatingSystems
10/14/2025
Virtual Address Mask
EasyOperatingSystems
10/14/2025
How Many Page Translations?
EasyOperatingSystems
10/14/2025
Scheduler Trade-offs
EasyOperatingSystems
10/14/2025
Who can share?
MediumOperatingSystems
10/13/2025
The OS Monarch
CookedOperatingSystems
10/13/2025
Clock Replacement Algorithm
EasyOperatingSystems
10/13/2025
CCan you treat me as an equal?
EasyOperatingSystems
10/13/2025
CWhy std::make_shared?
MediumLanguageKnowledge
10/13/2025
CHow many allocations?
EasyLanguageKnowledge
10/13/2025
Cuint32_t
EasyLanguageKnowledge
10/13/2025
The cost of .bss
EasyOperatingSystems
10/13/2025
If the OS is running...
EasyOperatingSystems
10/13/2025
CI'm concerned.
MediumDesignPatterns
10/13/2025
Which header?
EasyNetworking
10/13/2025
CAuto got it wrong.
MediumLanguageKnowledge
10/13/2025
CAaaargggc
MediumLanguageKnowledge
10/13/2025
CDo it for you.
MediumLanguageKnowledge
10/13/2025
PythonDefault Floating Point
EasyLanguageKnowledge
10/13/2025
CWe're both from the future!
MediumConcurrency
10/13/2025
PythonWhat are we replacing?
EasyLanguageKnowledge
10/13/2025
CConst and Not Const*
EasyLanguageKnowledge
10/13/2025
CSomething is wrong.
EasyConcurrency
10/13/2025
CWrong map, bro.
CrackedLanguageKnowledge
10/13/2025
CReturn type confusion.
MediumLanguageKnowledge
10/13/2025
Virtual address structure
EasyOperatingSystems
10/13/2025
PythonException Unwinding
MediumLanguageKnowledge
10/13/2025
The missing hops
EasyNetworking
10/13/2025
CWhat's wrong, loopy?
EasyLanguageKnowledge
10/13/2025
PythonPepsi
MediumLanguageKnowledge
10/13/2025
Endian? Is that a word?
CookedComputerArchitecture
9/16/2025
X-Way Set Associativity
CookedComputerArchitecture
9/16/2025
Cache Affinity
EasyComputerArchitecture
9/16/2025
Cache Coherence
EasyComputerArchitecture
9/9/2025
CPad it up!
EasyComputerArchitecture
9/9/2025
Instruction Set Categories
EasyComputerArchitecture
9/9/2025
Machine Language Components
CookedComputerArchitecture
9/9/2025
Branch Instruction Effects
EasyComputerArchitecture
9/9/2025
RISC Pipeline Structure
CookedComputerArchitecture
9/9/2025
Processor Architectural Divisions
MediumComputerArchitecture
9/9/2025
TCP Congestion Control Goals
EasyNetworking
9/9/2025
AIMD TCP
EasyNetworking
9/9/2025
TCP Socket
EasyNetworking
9/9/2025
Which way do I read this?
HardNetworking
9/9/2025
Which way do I read this, again?
EasyNetworking
9/9/2025
CChit chat.
EasyNetworking
9/9/2025
CI hate extern.
MediumLanguageKnowledge
9/9/2025
CModality of memory.
MediumLanguageKnowledge
8/22/2025
Why am I quicker than you?
EasyNetworking
8/22/2025
TCP Urgent Pointer
HardNetworking
8/22/2025
CIIFE
EasyLanguageKnowledge
8/22/2025
PythonWhat the f
CrackedLanguageKnowledge
8/22/2025
CParents are always right?
EasyLanguageKnowledge
8/22/2025
CAllocation decisions
EasyOperatingSystems
7/28/2025
PythonWheel of misfortune
MediumOperatingSystems
7/28/2025
Linux CFS
EasyOperatingSystems
7/28/2025
You're a snake.
CookedLanguageKnowledge
6/19/2025
COverloading the overload.
MediumLanguageKnowledge
6/19/2025
TLB Miss Handling
EasyOperatingSystems
6/19/2025
CIt's hidden
EasyLanguageKnowledge
6/19/2025
PythonShallow Copy
MediumLanguageKnowledge
6/19/2025
PythonStringy Cereal
MediumLanguageKnowledge
6/17/2025
Inverted Page Tables
CookedOperatingSystems
6/17/2025
IPv4 Header Recalculation
EasyNetworking
6/17/2025
PythonIn Python...
CookedLanguageKnowledge
6/17/2025
MAC Address Overlap
EasyNetworking
6/17/2025
CTemplates and references
EasyLanguageKnowledge
6/17/2025
CDouble trouble?
EasyLanguageKnowledge
6/17/2025
Python__doc__
MediumLanguageKnowledge
6/17/2025
PythonImport test.py
MediumLanguageKnowledge
6/16/2025
CDangerous for-loops.
MediumLanguageKnowledge
6/16/2025
CUnsigned Integer Overflow
EasyLanguageKnowledge
6/16/2025
SYN Flood
CookedNetworking
6/16/2025
Warm and toasty
CookedComputerArchitecture
6/16/2025
ARP-less
EasyNetworking
6/16/2025
Host Multicast Filtering
EasyNetworking
6/16/2025
What does 'JSON' stand for?
CookedLanguageKnowledge
6/16/2025
The birth of the process
CookedOperatingSystems
6/16/2025
Classful Addressing
EasyNetworking
6/16/2025
TCP Connection Termination
MediumNetworking
6/16/2025
Map the cache
MediumComputerArchitecture
6/16/2025
Clock Cycle and Pipeline Depth
EasyComputerArchitecture
6/16/2025
CCall it.
EasyLanguageKnowledge
6/16/2025
Cwtf const
MediumLanguageKnowledge
6/16/2025
Clong vs int
EasyLanguageKnowledge
6/16/2025
Nosy Cache
MediumComputerArchitecture
6/5/2025
CShortcuts
EasyLanguageKnowledge
6/5/2025
CABC. Easy as 123?
EasyLanguageKnowledge
6/5/2025
Split Problems
EasyOperatingSystems
6/5/2025
CWhat even is a string?
MediumLanguageKnowledge
6/5/2025
COverloading ++
EasyLanguageKnowledge
6/5/2025
RustDo you know its size?
MediumLanguageKnowledge
6/5/2025

Progress Overview

CorrectIncorrect