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

Contribution Graph for 2026
JanFebMarAprMayJunJulAugSepOctNovDec
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Less
More
Correct
550
Incorrect
64

Computer Architecture

56/61

Networking

38/96

Language Knowledge

385/710

Design Patterns

7/20

Concurrency

9/78

Operating Systems

96/103

Data

0/0

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Rank
Distinguished
Tier 7 of 11
Total XP
379,296
120,704 XP to Fellow52%
Them
8
Their rank
Score
452
Roughly Correct - Incorrect
Grinders
110898
Users with submissions
Strugglers
101159
Negative score users
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0.01%
User

Recently Completed

TitleStatusDate
Return from where?6/26/2026
Where did std::thread go?6/24/2026
Will It Cascade?6/24/2026
long long6/24/2026
Freedom?6/24/2026
Have him play with it.6/24/2026
A, B, C, harder than 1, 2, 36/24/2026
The perfect union 3.6/24/2026
Class inStruction 6/24/2026
Case and point 16/24/2026
What's Under Test 26/23/2026
Auto Type Deduction Rules6/23/2026
Maze creator6/23/2026
Is it composed?6/23/2026
How does it allocate?6/23/2026
Delete this. Now!6/23/2026
virtual <<6/23/2026
I only speak english6/23/2026
Tell me the time6/23/2026
Dynamic is powerful 16/19/2026
Hard-working students 6/8/2026
No-divisibility condition 6/8/2026
Simple system call overhead6/6/2026
getcracked, crackedget?6/3/2026
What do you expect?6/3/2026
Are they always like this?5/30/2026
Top of the stack5/30/2026
Facing chickens5/30/2026
When to take the money 5/30/2026
Permutations of permutations5/30/2026
In a constant bind.5/26/2026
Ban NULL5/26/2026
Deadly trinity.5/26/2026
null, for sure?5/26/2026
Class is in session.5/26/2026
Delete me nicely.5/26/2026
Why can't we be friends?5/26/2026
Deadlier trinity.5/26/2026
Templating differently.5/26/2026
Just die already.5/26/2026
RAII of light.5/26/2026
Compiled out.5/26/2026
Lamb-duh5/26/2026
Make it smaller.5/26/2026
Degenerate tree.5/26/2026
Let me give you a pointer.5/26/2026
Shallow people.5/26/2026
What's this? Get it out of my face.5/26/2026
No hot reload.5/26/2026
Pointers pointing to pointers 15/26/2026
Pointers pointing to pointers 25/26/2026
Guides5/26/2026
Just call me, baby.5/26/2026
Discrimination!5/26/2026
Newtwo5/26/2026
Build it.5/26/2026
A big byte.5/26/2026
One of these containers is not like the other.5/26/2026
Let's go global.5/26/2026
Override me.5/26/2026
Treat them as equals.5/26/2026
X of Y5/26/2026
l, x, pr5/26/2026
String placement5/24/2026
Constipated constexpr5/24/2026
Array extensioooooons5/24/2026
One after the other5/24/2026
2 variables 1 auto5/24/2026
I'm empty inside 35/24/2026
I'm empty inside 45/24/2026
I thought I understood this.5/24/2026
What's statically wrong?5/24/2026
Can you list what's initialized?5/24/2026
I'm printing mom...5/24/2026
What-value5/24/2026
Zero Division, Error Error?5/24/2026
Minus 05/19/2026
Lambda defaults5/6/2026
Forgot one?5/6/2026
Server failures I5/6/2026
How much did I win?5/6/2026
Slide into home5/6/2026
Overload what?5/1/2026
That guy across the room.5/1/2026
Manage everything for me.5/1/2026
Traffic light stop4/29/2026
All-even board4/28/2026
What DataFrame?4/28/2026
Pointer or String?4/28/2026
& and &&4/18/2026
Exploring a Hexagon4/18/2026
Sum to 54/18/2026
Yes, I know what a ... is4/17/2026
Many variables and just one line4/17/2026
Slice and dice 24/17/2026
Hashability Hurdles4/17/2026
Decorator Disaster4/17/2026
Instance Attributes4/17/2026
Simple logic, right?4/17/2026
Inquisitive Inheritance 34/17/2026
Lambda 1014/17/2026
Drawing socks 4/16/2026
Race to 504/15/2026
Waiting for Patterns: HT vs. HH4/11/2026
Custom deleter magic?4/8/2026
Going global4/8/2026
A, B, C, initializer_list4/7/2026
Initialization order.4/7/2026
He fumbled the [] operator.4/7/2026
Greedy Greedy4/7/2026
Const crashout 14/7/2026
What's wrong, loopy?4/7/2026
Do you understand creation?4/7/2026
I'm here! Now I'm gone.4/7/2026
Haha…4/7/2026
What's zero?4/7/2026
A Code Review 14/7/2026
Moved from.4/7/2026
Comparing your variants4/7/2026
Which Coin is Fake?4/5/2026
Difference in Dice4/3/2026
Lucky 74/2/2026
DataFrames and Tuples4/2/2026
Angles on a Clock4/2/2026
The Free Lunch4/2/2026
Kcats4/2/2026
constexpr if3/31/2026
Which kind of vector?3/30/2026
fp compatibility3/29/2026
What's the point?3/28/2026
Even if nothing!3/28/2026
Overloads 13/28/2026
How many allocations?3/28/2026
It's shared, but is it big?3/28/2026
auto&& T&& <T>&&3/28/2026
Friends make you fat?3/28/2026
In one out the other.3/28/2026
auto... &?3/28/2026
Character classes3/28/2026
Children make you fat?3/28/2026
Stop! Don’t move!3/28/2026
Keep your cool, keep it constant.3/28/2026
I'm moving in.3/28/2026
Understand lambdas, understand C++.3/28/2026
I like to share my pointer.3/28/2026
The headers you never knew3/28/2026
Simple Pointer Math3/28/2026
Vector growth 13/28/2026
Vector growth 23/28/2026
Is it used?3/28/2026
Unsigned Integer Overflow3/28/2026
Constructing it.3/28/2026
Overloading ++3/28/2026
A Loop Without A Loop3/28/2026
So, how big is vector?3/28/2026
Once or twice?3/28/2026
Comma'on!3/28/2026
Do-while...3/28/2026
Not this, again.3/28/2026
What even is a string?3/28/2026
& through me.3/28/2026
Catch me if you can!3/28/2026
The perfect union.3/28/2026
0.0_73/28/2026
structs of structs of structs3/28/2026
Another string question?3/27/2026
Are you pessimistic?3/27/2026
Bodyguard3/25/2026
Satisfy me!3/24/2026
Get it for me quick!3/23/2026
If Else... What?3/22/2026
1s in chat if you're cooked3/22/2026
structs of structs of structs 23/22/2026
Herb's Destructor3/22/2026
Shallow Copy3/22/2026
The Loop's Last Laugh3/22/2026
Hash Collisions3/22/2026
So, where is 1 stored?3/21/2026
Global Local Lambda Capture3/21/2026
One of these mains.3/21/2026
It's a simple struct.3/21/2026
Stay there.3/21/2026
Arms length3/21/2026
Don't end me.3/21/2026
Inheriting Itself?3/21/2026
Throwing a wrench out of it.3/21/2026
What's the alignment?3/21/2026
Throwing a wrench into it.3/21/2026
Move!3/21/2026
96% of you will fail this.3/21/2026
Woopsie noexcept Method3/21/2026
Catching noexcept Method3/21/2026
Throwing noexcept Method?3/21/2026
Delete Delete Delete3/21/2026
The Memory Model's Introduction3/21/2026
Nested Namespaces3/21/2026
Signed Char == Unsigned Char?3/21/2026
Void Pointer Dereferencing3/21/2026
Struct over Class3/21/2026
Quantum Defaults3/21/2026
EEEEEEEEEEI3/21/2026
IEEEEEEEEEE3/21/2026
System Dichotomy3/21/2026
private, public, protected3/21/2026
How many copies?3/21/2026
Cache me if you can! 23/21/2026
Cache me if you can!3/21/2026
Bimodal prediction II3/21/2026
That's BS!3/21/2026
Nosy Cache3/21/2026
Bimodal prediction.3/21/2026
Clock Cycle and Pipeline Depth3/21/2026
What does Tom do?3/21/2026
Lions and buffalos3/21/2026
The country of Python's GDP3/21/2026
random_insert3/20/2026
You don't always matter to me3/11/2026
I'm empty inside 23/11/2026
Tag, you're it.3/11/2026
Processor Architectural Divisions3/11/2026
Memory Address Translations3/11/2026
How big is it?3/11/2026
It's massive.3/11/2026
Cache Affinity3/11/2026
Pad it up!3/11/2026
Cache Coherence 3/11/2026
Branch Instruction Effects3/11/2026
Instruction Set Categories3/11/2026
How much parallelism?3/11/2026
Which-Way Associativity?3/11/2026
Pipeline Operation Basics3/11/2026
Speedup again3/11/2026
Speedup3/11/2026
Invoke me.2/22/2026
Unsigned - Unsigned2/21/2026
Exception safety guarantees2/21/2026
Templates and references2/21/2026
Who comes first?2/21/2026
In a Diamond2/21/2026
++ before or after?2/21/2026
Class Inheritance Access Control2/21/2026
Empty Structs2/21/2026
Observe Closely2/21/2026
delete it.2/20/2026
Shortcuts2/20/2026
Conditional Trap2/20/2026
Signed Integer Overflow2/20/2026
Under the Shadow2/20/2026
I am the shadows.2/20/2026
Zero Division, Error?2/20/2026
Storage Duration2/20/2026
Exception in my constructor2/20/2026
override!2/20/2026
PML42/18/2026
PML?2/18/2026
stderr2/18/2026
Allocation decisions2/18/2026
Map the cache, again2/18/2026
Map the cache2/18/2026
Space the cache2/18/2026
The whole shebang2/18/2026
isolcpu, taskset, pthread_setaffinity.2/18/2026
Softly Interrupted2/18/2026
The Doorbell2/18/2026
Which way do I read this?2/18/2026
What's wrong with this query?2/18/2026
Don't interrupt me 86 times.2/17/2026
The New API2/17/2026
Where can I find you?2/17/2026
Can you treat me as an equal?2/17/2026
To Interrupt or To Poll2/17/2026
Are you done?2/17/2026
Process Control Block2/16/2026
Fast Random2/16/2026
Scalable Counter Design2/16/2026
If the OS is running...2/16/2026
How Many Page Translations?2/16/2026
Interrupting an interrupt.2/16/2026
Before main()2/16/2026
Scheduler Trade-offs2/16/2026
System vs Procedure Call2/16/2026
Why an OS?2/16/2026
Job Scheduling2/16/2026
But how do it do?2/16/2026
It's magic.2/16/2026
Who can share?2/16/2026
Weighing Jobs2/16/2026
Stack Direction2/16/2026
Fragmentation 12/16/2026
Dealing with Fragmentation2/16/2026
What am I using to lock this?2/16/2026
Top heavy 2/16/2026
They're stacked.2/16/2026
The cost of .bss2/16/2026
Virtual address structure2/16/2026
Buddy Allocation System2/16/2026
Split Problems2/16/2026
TLB Miss Handling2/16/2026
Multi-level Page Tables2/16/2026
Shake it, shake, shake it.2/16/2026
Clock Replacement Algorithm2/16/2026
Lock Coupling2/16/2026
Producer-Consumer Signaling2/16/2026
Semaphore Basic Definition2/16/2026
Instruction Set Architecture2/16/2026
What 'E'?2/16/2026
TLB Switch2/16/2026
3 Cache Misses2/16/2026
Take your place!2/16/2026
Object Instantiation2/15/2026
Min Minister2/15/2026
Generational Generator2/15/2026
My snake ate my trash2/15/2026
Remove it from me.2/15/2026
[Grid[Grid]]2/15/2026
left or right?2/15/2026
Taken with context2/15/2026
Do this then that2/15/2026
Dependable developers?2/15/2026
What is your flag?2/15/2026
Know your math2/15/2026
Your code doesn't look like mine2/15/2026
So, what else?2/15/2026
It's over, Load!2/15/2026
I love big numbers2/15/2026
Wannabe2/15/2026
Comparisons2/15/2026
Screw the protocol!2/15/2026
So, how big is X?2/9/2026
malloc outside pymalloc2/9/2026
Exception Unwinding2/9/2026
print function?2/8/2026
I have a small dict 31/30/2026
Put on chains1/28/2026
Overloading lambdas!1/27/2026
User / Standard Conversions1/24/2026
Schrödinger's Initializer1/23/2026
Chop Chop Chop1/23/2026
Floating points, you sure?1/23/2026
What's a lambda?1/21/2026
uint32_t1/21/2026
To <T> or not to <T>1/21/2026
Initialization?!1/19/2026
It's unique, but is it big?1/19/2026
Who are you pointing to?1/19/2026
Shifting off the edge1/19/2026
Changing Const?1/18/2026
Default shared pointer1/18/2026
Typename...1/18/2026
Shared pointer constructor1/18/2026
Class vs Struct1/18/2026
Why std::make_shared?1/9/2026
Future shock12/27/2025
Cache me if you can! 312/18/2025
std::cout vs std::cerr11/22/2025
Half and Half11/21/2025
Ouroboros 211/21/2025
IPC mutex11/20/2025
a + b + c11/19/2025
Mutual friends11/16/2025
Lord of Dot11/15/2025
That mysterious line11/6/2025
Infinite integer + incremental game11/3/2025
Assign to what?11/3/2025
indentation no more10/29/2025
tupleware10/29/2025
Metaclasses basics10/25/2025
String is strange10/21/2025
Linux CFS10/20/2025
Type, enter, run10/20/2025
C++ is a…10/18/2025
Pepsi10/9/2025
Switch hitter10/8/2025
Up-to-date logs10/3/2025
Paradox of Logic10/2/2025
I know what a tuple is.10/2/2025
Python 2.1110/2/2025
We love birds!10/2/2025
Know your yield9/28/2025
Path to return 29/26/2025
Path to return9/26/2025
Sir, what's your order?9/26/2025
__main__9/24/2025
Vector construction9/23/2025
I'm non-binary.9/22/2025
Present your id9/22/2025
I have a small dict 29/22/2025
__doc__9/22/2025
Find me!9/22/2025
Where's my path?9/22/2025
I'm a B student.9/22/2025
The counsel votes.9/22/2025
Fooor! 29/22/2025
Stringy Cereal9/22/2025
A black cat and dark coffee.9/22/2025
Three by three9/21/2025
Small Numbers9/21/2025
Zero Division Error9/21/2025
sorted() vs sort()9/21/2025
Sorting the sorted.9/21/2025
Mangled up.9/21/2025
Freaky Files9/21/2025
Simple math, right?9/21/2025
What are __slots__?9/21/2025
Zip it9/21/2025
Duck Duck Goose9/21/2025
Default Arguments 9/21/2025
Unpack the pops9/21/2025
Plus Minus Sanity9/21/2025
Scope the Scope9/21/2025
A Number Walks Into a Base...9/21/2025
Sick wheels9/21/2025
CPython id9/21/2025
The Python Memory Manager9/21/2025
Shallow Waters9/21/2025
Let's get this party started.9/21/2025
tuple vs list9/21/2025
Living by Proxy9/21/2025
GILty pleasure9/21/2025
Put the Fries in the Bag9/21/2025
frozenset vs set9/21/2025
Multiple Assignment9/21/2025
Scope the Scope 29/21/2025
**kwargs and kwargs9/21/2025
**args9/21/2025
Small Integer Caching9/21/2025
Zip it 29/21/2025
What are we replacing?9/20/2025
Python is #19/20/2025
IndexTF9/20/2025
Chiral9/20/2025
Why am I quicker than you?9/20/2025
TCP Socket9/20/2025
Underlying Protocols9/20/2025
Either lower or uppercase9/20/2025
TCP Flow Control9/19/2025
DNS Namespace Structure9/19/2025
MAC Address Overlap9/19/2025
Class A Networks9/19/2025
TCP RTO Calculation9/19/2025
Multicast Group Membership9/19/2025
Printing the printer.9/18/2025
Amdahl's Law Application9/17/2025
Special Use Address 19/17/2025
How big are the lines?9/17/2025
Virtual Address Mask9/17/2025
You Dirty Bit.9/17/2025
X-Way Set Associativity 9/17/2025
Logical Deduction?9/16/2025
RISC Pipeline Structure9/16/2025
RAM to Cache Memory Transport9/16/2025
OS OSI9/16/2025
Base my bounds9/16/2025
Page Fault Mechanism9/16/2025
Speak the language.9/16/2025
Thinking of memory strategically9/16/2025
del and __del__9/16/2025
locals()9/15/2025
globals()9/15/2025
Why even IP?9/15/2025
Whichcast9/15/2025
The birth of the process9/15/2025
ISA Components9/15/2025
What is a Software Thread?9/15/2025
So, where is X stored?9/14/2025
"-OO"H...9/14/2025
Comparison conundrum. 9/14/2025
What the f9/14/2025
Slash slash9/14/2025
Give me a hint!9/14/2025
Maximal Snake9/14/2025
__code__ Attributes9/13/2025
Default Floating Point9/13/2025
How well can you print?9/13/2025
LEGB!9/13/2025
Simple Type9/13/2025
Cereal printer9/13/2025
Python Overloading9/13/2025
__future__9/13/2025
"Hello"9/13/2025
We live in divided times.9/13/2025
Slice and dice 19/13/2025
GIL9/13/2025
So, where is 1,000 stored?9/13/2025
Counting objects.9/13/2025
Get truthed.9/13/2025
Dis Me9/13/2025
List in Function9/13/2025
A Slice of Confusion9/13/2025
Memorize to Memoize9/13/2025
idx, idx9/13/2025
Difficulty enumerations.9/13/2025
So, where is the list stored?9/13/2025
Strings in Python9/13/2025
So, what's UDP?9/13/2025
Fooor!9/13/2025
Pi-Pi-Pi9/13/2025
__new__ vs __init__9/13/2025
What the fork?9/13/2025
Stayin' Alive9/13/2025
MTU Violation9/13/2025
You're a snake.9/13/2025
Inheritance in the Deep9/13/2025
Private to Public9/13/2025
The Page Replacement Algorithm9/13/2025
ISA Instructions9/13/2025
Are you still alive?9/13/2025
type of { }9/13/2025
Lost Wakeup9/13/2025
Interning It9/13/2025
Network Layers9/13/2025
TCP Congestion Detection9/13/2025
Stayin' Dead9/13/2025
Set the Record Straight9/13/2025
How many kids do I want?9/13/2025
It's our time!9/13/2025
Inverted Page Tables9/13/2025
Condition Variable Purpose9/13/2025
Sharing is caring.9/13/2025
Don't @ me9/13/2025
A onephore9/13/2025
Common ISAs9/13/2025
Split segments9/13/2025
Pipeline Performance Calculation9/13/2025
Indexing arrays9/13/2025
Ampersand9/13/2025
Linux, what are you using?9/13/2025
I hate decltype9/13/2025
CTAD9/13/2025
Where'd it go?9/13/2025
TCP Fast Retransmit9/13/2025
TCP Sequence Numbers9/13/2025
How big is a pointer?9/13/2025
TCP Flow Control Purpose9/13/2025
Pay your fair share.9/13/2025
Join me9/13/2025
When are we racing, and what is the condition?9/13/2025
Boolean Addition9/13/2025
std::is_signed<char>::value9/13/2025
The fundemental page9/13/2025
Clean up the thread9/13/2025
Uncontrolled scheduling9/13/2025
TCP Data Integrity9/13/2025
You're too big!9/13/2025
TCP Termination Process9/13/2025
Endian? Is that a word?9/13/2025
In Python...9/13/2025
SYN Flood9/13/2025
Condition Variable Atomicity9/13/2025
Page Table Present Bit9/13/2025
ARP Cache9/13/2025
Memory Segmentation9/13/2025
#square9/13/2025
Replace all the functions!9/13/2025
ARP ARP ARP9/13/2025
Swap Space Function9/13/2025
What does 'SQL' stand for?9/13/2025
Walrus9/13/2025
Dunder Dunder Dunder9/13/2025
The OS Monarch9/13/2025
Non-const reference T9/13/2025
Process States9/13/2025
Memory Addressing Modes9/13/2025
Counter Thread Safety9/13/2025
How are jobs stored?9/13/2025
Make it pretty.9/13/2025
Spin what lock?9/13/2025
Method-only objects9/13/2025
What's suspect?9/13/2025
Help! My Users Keep Changing! 9/13/2025
L1 Cache Split9/13/2025
Sharing data the nice way.9/13/2025
Understand your environment9/13/2025
TLB Purpose9/13/2025
static references9/13/2025
Pipelining Performance Benefits9/13/2025
Cache Inclusion9/13/2025
Branch Instruction Types9/13/2025
More data more problems9/13/2025
Lock Purpose Basics9/13/2025
Single-Cycle Processor Limitations9/13/2025
After main()9/13/2025
Machine Language Components9/13/2025
Is Python...?9/13/2025
What does 'JSON' stand for?9/13/2025
LRU Replacement Policy9/13/2025
Auto with Braced Initializers9/13/2025
P switch T switch.9/12/2025
Comparsion9/12/2025
I have a small dict.9/12/2025
Which one should I choose?9/12/2025
name is what?9/12/2025
TCP Reliability Mechanism9/12/2025
Ding ding ding!9/12/2025
Interacting with the OS9/12/2025
DNS Basic Function9/12/2025
Warm and toasty9/12/2025
Spin Lock Inefficiency9/12/2025
Double flushing?9/12/2025
Thread Motivation Basics9/12/2025
Translate which address?9/12/2025
TCP Service Model9/12/2025
Broadcast vs Multicast9/12/2025
What does 'CSV' stand for?9/12/2025
Signal vs Broadcast9/12/2025
TCP Three-way Handshake9/12/2025
NUMA NUMA NUMA 9/12/2025
DNS Caching Benefits9/12/2025
IP Forwarding9/12/2025
Registering RAM9/12/2025
get ref 29/12/2025
get ref9/12/2025
get ref 39/12/2025
get ref 49/12/2025

Progress Overview