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

Contribution Graph for 2026
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Correct
334
Incorrect
92

Computer Architecture

22/61

Networking

51/96

Language Knowledge

264/710

Design Patterns

8/20

Concurrency

17/78

Operating Systems

64/103

Data

0/0

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Staff
Tier 5 of 11
Total XP
88,357
11,643 XP to Principal81%
Them
30
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Score
242
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Grinders
110898
Users with submissions
Strugglers
101159
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User

Recently Completed

TitleStatusDate
You don't always matter to me12/22/2025
Constipated constexpr12/22/2025
Too many question(mark)s12/22/2025
They're stacked.12/22/2025
a + b + c12/22/2025
I'm concerned.9/14/2025
Freedom?9/14/2025
Iterator Shenanigans9/8/2025
I hate extern.9/8/2025
To delete or not to delete9/8/2025
++i ++i9/8/2025
___ is to size_t9/8/2025
Where do we go now?9/8/2025
Stop! Don’t move!9/8/2025
String them together.9/8/2025
Chit chat.9/8/2025
CTAD9/5/2025
Multi-level Page Tables9/5/2025
You Dirty Bit.9/5/2025
Virtual Address Mask9/5/2025
Side-by-side9/5/2025
Down shift9/5/2025
Vector growth 29/3/2025
The headers you never knew9/3/2025
Dangerous for-loops.9/3/2025
Virtually a template.9/3/2025
Overloads 19/3/2025
I min-maxed my character.9/3/2025
Containers for containers.9/3/2025
Boolean Addition9/2/2025
You're too big!9/2/2025
Page Fault Mechanism9/2/2025
What's Under Test 29/2/2025
Page Table Present Bit9/2/2025
Pay your fair share.9/2/2025
ARP ARP ARP9/2/2025
What 'E'?8/29/2025
How are jobs stored?8/29/2025
Indexing arrays8/29/2025
The fundemental page8/29/2025
What's suspect?8/29/2025
I don't get the pun.8/29/2025
Process Control Block8/29/2025
The OS Monarch8/29/2025
Process States8/29/2025
Comparsion8/28/2025
Which way do I read this, again?8/28/2025
Overloading lambdas!8/28/2025
Bound to love lower_bound.8/28/2025
Private to Public8/27/2025
TCP Data Integrity8/27/2025
Whichcast8/27/2025
Multicast Addressing8/27/2025
Memory Segmentation8/27/2025
Changing Const?8/27/2025
When are we racing, and what is the condition?8/27/2025
Once or twice?8/27/2025
Is it composed?8/27/2025
Is it used?8/27/2025
Do-while...8/27/2025
What the fork?8/27/2025
& through me.8/27/2025
0.0_78/27/2025
Fragmentation 18/27/2025
I like to share my pointer.8/27/2025
Short Flings, Long Affairs8/27/2025
Who’s Pointing at What?8/23/2025
Typename...8/23/2025
Not this, again.8/23/2025
Comma'on!8/23/2025
Stack Direction8/23/2025
Where can I find you?8/21/2025
Parents are always right?8/21/2025
Can you treat me as an equal?8/21/2025
Where did it go?8/21/2025
He fumbled the [] operator.8/21/2025
Templates and references8/21/2025
Move!8/21/2025
Moved from.8/21/2025
Don't end me.8/21/2025
Vector construction8/21/2025
Ampersand8/21/2025
Greedy Greedy8/21/2025
I hate decltype8/21/2025
Do you understand creation?8/21/2025
Method-only objects8/21/2025
What's a lambda?8/21/2025
I'm here! Now I'm gone.8/21/2025
Memory order I8/21/2025
Unsigned - Unsigned8/21/2025
Conditional Trap8/21/2025
Why std::make_shared?8/21/2025
Signed Integer Overflow8/21/2025
I am the shadows.8/21/2025
Base my bounds8/20/2025
Cache Affinity8/20/2025
Machine Language Components8/20/2025
Before main()8/20/2025
TCP Congestion Control Goals8/20/2025
How Many Page Translations?8/20/2025
Speak the language.8/20/2025
2 Types of Parallelism8/20/2025
RAM to Cache Memory Transport8/20/2025
Dealing with Fragmentation8/20/2025
Who can share?8/20/2025
So, what's UDP?8/20/2025
If the OS is running...8/20/2025
Hey, catch!8/20/2025
int : =8/19/2025
Lambda defaults8/19/2025
Forgot one?8/19/2025
Who owns whom?8/19/2025
Elusive for life.8/19/2025
ZST behavior8/19/2025
In the beginning...8/19/2025
Exit the function early.8/19/2025
Am I missing something?8/19/2025
How'd you read this?8/19/2025
Keep your cool, keep it constant.8/19/2025
Add 2+2.8/19/2025
float vec!8/19/2025
dotdot dotdot dotdot8/19/2025
Getting high(er).8/19/2025
Lock Purpose Basics8/18/2025
Sharing data the nice way.8/18/2025
More data more problems8/18/2025
L1 Cache Split8/18/2025
Interacting with the OS8/18/2025
Broadcast vs Multicast8/18/2025
static references8/18/2025
Cache Inclusion8/18/2025
Help! My Users Keep Changing! 8/18/2025
Ding ding ding!8/18/2025
Non-const reference T8/18/2025
Spin Lock Inefficiency8/18/2025
Signal vs Broadcast8/18/2025
Translate which address?8/18/2025
DNS Basic Function8/18/2025
Is Python...?8/18/2025
Single-Cycle Processor Limitations8/18/2025
Pipelining Performance Benefits8/18/2025
NUMA NUMA NUMA 8/18/2025
TCP Three-way Handshake8/18/2025
TLB Purpose8/18/2025
Thread Motivation Basics8/18/2025
TCP Service Model8/18/2025
Registering RAM8/18/2025
3 exits8/18/2025
Delete this. Now!8/18/2025
IP Forwarding8/18/2025
Double flushing?8/18/2025
After main()8/18/2025
Null and void.8/18/2025
Where are we?8/18/2025
Arms length8/18/2025
Where is ARP?8/18/2025
Very Blank Namespace8/18/2025
X ways8/18/2025
Continue, break, loop, return.8/18/2025
Return what?8/18/2025
Virtual address structure8/15/2025
What's wrong with this query?8/15/2025
P switch T switch.8/14/2025
Why am I quicker than you?8/14/2025
? 1 : 2 -> auto8/13/2025
Adding const, overrid-ially.8/13/2025
You're still not real.8/13/2025
Melvin, The 1HP Intern8/13/2025
as-if I'd ever let you.8/13/2025
This is C++?8/13/2025
It's weak, but how big is it?8/13/2025
Point to me!8/13/2025
Haha…8/13/2025
Allocation decisions8/13/2025
Pointers to Pointers to Pointers8/13/2025
So close to unwinding.8/12/2025
Char + Char8/12/2025
IIFE8/12/2025
Zip it 38/12/2025
Understand lambdas, understand C++.8/12/2025
[[..something..]]8/11/2025
I don't give a flying float8/11/2025
private, public, protected8/11/2025
What even is a string?8/11/2025
what??!|8/11/2025
Overloading ++8/11/2025
stderr8/11/2025
Shortcuts8/11/2025
A Code Review 18/11/2025
You don't get references.8/11/2025
How big is a pointer?8/11/2025
Inheriting Itself?8/11/2025
Shared pointer constructor8/11/2025
The Memory Model's Introduction8/11/2025
Modality of memory.8/11/2025
(a = b)8/11/2025
Whatever floats your cope.8/11/2025
Drop these.8/11/2025
96% of you will fail this.8/7/2025
[0]8/7/2025
He chose me. 8/7/2025
Delete Delete Delete8/7/2025
Thread Pool Benefits8/7/2025
Host Multicast Filtering8/7/2025
Special Use Address 18/7/2025
TCP Urgent Pointer8/7/2025
++ before or after?8/7/2025
What does 'CSV' stand for?8/7/2025
Dereference++8/7/2025
Double trouble?8/7/2025
Maximal Snake8/7/2025
Location of &str data8/7/2025
X-Way Set Associativity 8/7/2025
Scheduler Trade-offs8/7/2025
Can you add 1?8/7/2025
Weighing Jobs8/7/2025
-dont-elide-me8/7/2025
AIMD TCP8/7/2025
containers and constexprs8/7/2025
I really hate decltype8/7/2025
Joined together.8/7/2025
What does 'JSON' stand for?8/7/2025
Network Layers8/7/2025
Throwing a wrench into it.8/7/2025
Enchanted maze8/7/2025
Under the Shadow8/7/2025
It's hidden8/7/2025
Endian? Is that a word?8/7/2025
r-expression8/7/2025
Class B Networks8/7/2025
Which-Way Associativity?8/7/2025
Comma'on, on!8/7/2025
What is a Software Thread?8/7/2025
Code, Stack, Heap8/7/2025
Stayin' Alive8/7/2025
A black cat and dark coffee.8/7/2025
Accumulate it all in parallel.8/7/2025
Run it, debug it, release it.8/7/2025
Instruction Set Categories8/7/2025
Observe Closely8/7/2025
What a Jump!8/7/2025
Talks like one, walks like one.8/7/2025
Rust is... strange.8/7/2025
Exception in my constructor8/7/2025
System vs Procedure Call8/7/2025
What's a character?8/7/2025
What's wrong, loopy?8/7/2025
What am I using to lock this?8/7/2025
Subnets8/7/2025
Box me in, coach.8/7/2025
_global_variable8/7/2025
It's our time!8/7/2025
A template, or not?8/7/2025
Clone it, Luke8/7/2025
Not too deep8/7/2025
Using vs Typedef8/7/2025
More constants more problems.8/7/2025
I'm moving in.8/7/2025
Something is wrong.8/7/2025
ABC. Easy as 123?8/7/2025
A onephore8/7/2025
Lossy.8/7/2025
Producer-Consumer Signaling8/7/2025
Empty resource manager8/7/2025
Aliasing static references8/7/2025
Who comes first?8/7/2025
Drop it like it's hot.8/7/2025
(type(expression))8/7/2025
Throw me out.8/7/2025
Aaaargggc8/7/2025
Lost Wakeup8/7/2025
How many kids do I want?8/7/2025
std::forward8/7/2025
TCP Connection Termination8/7/2025
Struct over Class8/7/2025
Return type confusion.8/7/2025
Simple Pointer Math8/7/2025
Scalable Counter Design8/7/2025
IPv6 ARP?8/7/2025
Zero Division, Error?8/7/2025
A very small value8/7/2025
delete it.8/7/2025
Storage Duration7/16/2025
Even One Virtual Method7/16/2025
It's magic.7/16/2025
Are you still alive?7/16/2025
Munch munch munch!7/16/2025
TCP Fast Retransmit7/16/2025
A Slice of Confusion7/16/2025
DS, but not Nintendo.7/16/2025
uint32_t7/16/2025
Pad it up!7/16/2025
GG7/16/2025
Specialize me.7/16/2025
Initialization order.7/16/2025
The birth of the process7/16/2025
Multiple Assignment7/16/2025
Stack to heap 7/16/2025
You don't understand strings.7/16/2025
Initialization?!7/16/2025
Trailing Return Type Purpose7/16/2025
Are we compatible?7/16/2025
Linux Stayin' Alive7/16/2025
What pointer?7/16/2025
Do you know its size?7/16/2025
Condition Variable Purpose7/16/2025
Only these can do this.7/16/2025
Split Problems7/16/2025
Buddy Allocation System7/16/2025
Simple Type7/16/2025
Unsigned Integer Overflow7/16/2025
How big is it?7/16/2025
What's zero?7/16/2025
How big is this str?7/16/2025
What's Under Test 17/16/2025
Copying and Not Copying7/16/2025
**args7/16/2025
So, where is the list stored?7/16/2025
Walrus7/16/2025
TCP Checksum Coverage7/16/2025
OS OSI7/16/2025
First or second?7/16/2025
How Much More New?7/15/2025
Vector growth 17/15/2025
Clock Replacement Algorithm7/15/2025
Weapons system7/15/2025
Templated templates7/15/2025
Blank Namespace7/15/2025
Empty Structs7/15/2025
Clean up the thread7/15/2025
I'm harboring ints.7/15/2025
Is a pointer a pointer?7/15/2025
TCP Sequence Numbers7/15/2025
DNS Caching Benefits7/15/2025
Default shared pointer7/15/2025
A mix of creations.7/15/2025
Broadcast Reception Control7/15/2025
In a Diamond7/15/2025
Warm and toasty7/15/2025
How fine is the grain?7/15/2025
MTU7/15/2025
So, what's TCP?7/15/2025
You're volatile.7/15/2025
What's the alignment?7/15/2025
Change it for me.7/15/2025
Slash slash7/15/2025
arrrrg7/15/2025
Static* and Dynamic*7/15/2025
Strings? Chars? Cooked.7/15/2025
Interrupting an interrupt.7/15/2025
Overloading the overload.7/15/2025
Default Floating Point7/15/2025
Nested Namespaces7/15/2025
Get rid of it, maybe?7/15/2025
Auto got it wrong.7/15/2025
MAC Address Overlap7/15/2025
This scares me.7/15/2025
Const crashout 17/14/2025
Using Decltype Auto7/14/2025
Which header?7/14/2025
I’m empty inside 1.7/14/2025
Sequential guarantees7/14/2025
Wheel file7/14/2025
Chop Chop Chop7/14/2025
SYN Flood7/14/2025
Parallel pitfalls7/14/2025
Ranges of enums7/14/2025
Do it for you.7/14/2025
The cost of .bss7/14/2025
Unsafe code safety7/14/2025
Class Inheritance Access Control7/14/2025
A, B, C, initializer_list7/14/2025
A Loop Without A Loop7/14/2025
Classful Addressing7/14/2025
One of these mains.7/14/2025
Class vs Struct7/14/2025
How many allocations?7/14/2025
Workload Distribution7/14/2025
Exception safety guarantees7/14/2025
ABA Problem in Lock-free Code7/14/2025
It's shared, but is it big?7/14/2025
So, how big is vector?7/14/2025
Floating points, you sure?7/14/2025
"Hello"7/14/2025
TCP Socket7/14/2025
long vs int7/14/2025
Why an OS?7/14/2025
Understanding arrays7/14/2025
RISC Pipeline Structure7/14/2025
Multicast Address Range7/14/2025
IPv4 Header Recalculation7/14/2025
Concepts require understanding.7/14/2025
Call it.7/14/2025
So, where is X stored?7/14/2025
SFINAE7/14/2025
Pointer or String?7/14/2025
In Python...7/14/2025
To <T> or not to <T>7/14/2025
Stringy Cereal7/14/2025
Broadcast Address Types7/14/2025
TCP Flow Control7/14/2025
TLB Miss Handling7/14/2025
Transfering namespaces7/14/2025
Processor Architectural Divisions7/14/2025
wtf const7/14/2025
Semaphore Basic Definition7/14/2025
What are we replacing?7/14/2025
Linux CFS7/14/2025
So, how big is X?7/14/2025
ARP-less7/14/2025
Replace all the functions!7/14/2025
Constructing it.7/14/2025
Shadowing7/14/2025
Delayed Acknowledgments7/14/2025
References in Class7/14/2025
LRU Replacement Policy7/14/2025
What does 'SQL' stand for?7/14/2025
More chars more problems.7/14/2025
Which way do I read this?7/14/2025
You're a snake.7/14/2025
Impermissible Atomics7/14/2025
It's a simple struct.7/14/2025
Memory Address Translations7/14/2025
Instruction Set Architecture7/14/2025
TCP Packet Reordering7/14/2025
r-value confusion.7/14/2025

Completed Quizzes

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