Updates from the Repl.it team about the product

← Back to all posts
WEEKLY CHALLENGES #1
h
TheDrone7

Hello all replers! Today, I'm going to be announcing something new and fun for you all. We're introducing WEEKLY CHALLENGES!.

So, what are these weekly challenges? These are small beginner-friendly programming problems for the community to solve. We will be posting one of these every week. After 1 week of posting the challenge, we'll stop accepting any answers for the current challenge and post a new one, (although, you can still solve these for fun or just to learn something new).

And, what's in it for me? We will grade your submissions for each challenge you attempt. By the end of the month, the person to have the highest total score will be awarded 1 month of free hacker plan!!

HOW DO I SUBMIT? You can submit your answers by sharing the repls to the share board of repl talk and ensure that the name of the post contains #WEEKLY (in all caps, this will help us filter your submissions).

Now that all the introductions are done, let's get to the point, i.e. this week's weekly challenge!


Multiplication!


For this week's weekly challenge, you will need to write a program that multiplies 2 numbers. BUT, there's a twist. You are NOT ALLOWED to use the multiplication operator (*) or loops(for, while or any other that your prefered language may support, goto also counts as a loop). You cannot use any external libraries and anything else is allowed.

QUICK NOTE : Since these challenges are very easy, this should be obvious but we will not only be judging your output but also your code. The actual marking scheme will remain hidden though.

Voters
jacksmolenski
otrotazo
darksideofthero
Avxak
ancoder
jwdjen
whovian44
eankeen
theangryepicbanana
Vandesm14
Comments
hotnewtop
KobeFF

In LOLCODE can you use the PRODUCKT function?

HackermonDev

What if you already have hacker plan? Will they change the expiring date of the hacker plan?

HahaYes

@PDanielY They will probably wait for it to expire then give you an extra month

yummypasta

Here's my esoteric solution, leveraging the fact that for any number a in base b, a << 1 (append a 0 to the end) is a * b.

Note: Only works if 2 <= b <= 36, and both a and b is an integer.

AgastyaSandhuja

can you use a module where you can just do

IceWolfy1

@AgastyaSandhuja i would assume no becouse in that it uses the * but i could be wrong

NoelB33
AgastyaSandhuja
Coder100

not allowed hacker lmao
@AgastyaSandhuja

TheDrone7

NO @AgastyaSandhuja there should be no use of any multiplication operator or loops or external modules.

AgastyaSandhuja

ok lol @TheDrone7

dotcomboom

dude python lmao

eric_wang

@dotcomboom you might need to count for the zerodivisionerror edge case, in the event that y is 0.

dotcomboom

@eric_wang Good point, here's my updated version:

Scoder12

Awesome free hacker plan here I come

eankeen

are multiple submissions valid? @TheDrone7

PYer

same. I have 3 ideas already... @eankeen

TheDrone7

No @eankeen. You may only make one submission. Submit the one you think will score the highest ;)

eankeen

@TheDrone7 yass okay thanks

PYer
Lord_Poseidon

do recursive functions count as loops?

TheDrone7

No, they don't. @Lord_Poseidon

Lord_Poseidon

@TheDrone7 YEET. I already cooked up a dumb method involving map, strings, lists and binary arithmetic. Are multiple submissions allowed?

TheDrone7

No @Lord_Poseidon only submit the one you think will score the most.

Lord_Poseidon

without even knowing how code is judged? This is sad :(

AtriDey

Can I use automation plugins? Not a math plugin, but a mouse mover.

Coder100

lol what do you need a mouse for XD
pyautogui doesn't work on repl.it :( @AtriDey

AtriDey

@Coder100 autopy works without a hitch.

JackFly26

if i do it in brainf can i use loops

Coder100
AtriDey

So there can be no loops in a code file (py, cpp, js, etc)
And does the math have to be done in the program?
CMON CODEMONKEY TOOK MY IDEA I NEED A LOOPHOLE NOW!

Codemonkey51
NoelB33

Well, he never said it has to be done in a code file... @AtriDey

ABDOABDO11

const multiply=require("multiplier");
function multiple(num1, num2){
return multiply(num1, num2);

}
console.log(multiple(5, 5))

ChezCoder

will python chr() and eval() work?

TheDrone7

chr - yes. eval - no. @ChezCoder

ChezCoder
eartharoid

https://repl.it/@eartharoid/WEEKLY-1
not sure if an interval counts as a loop
probably a terrible way to do it, but it works. :)

TheDrone7

Intervals do count as loops. @eartharoid

eartharoid
ChezCoder
ChezCoder
DynamicSquid

Quick question, can I use for_each()? Not to multiply the number directly, but it's for a list

TheDrone7

Nope @DynamicSquid no loops allowed.

DynamicSquid

Wait, so I can still use #include <something>, right?

AtriDey

@DynamicSquid I haven't touched C++ in a while, but I think header files count as external libraries. Idk, it's up to @TheDrone7.

DynamicSquid

@AtriDey but like, i'm assuming we can use iostream, so I think @TheDrone7 is referring to things withing the standard namespace

AtriDey

@DynamicSquid Yeah, no iostream is sorta harsh. Since stdio.h is also a header, I guess some exceptions have to be made. I guess we wait for @TheDrone7.

AmazingMech2418

@DynamicSquid iostream and iomanip should be allowed (or in C, stdio and stdlib), but I think others that add functionality to the language that is not required (sorry, I think maybe even vector) are not allowed.

TheDrone7

You can use any modules from the standard library of the language, just not external modules that don't come built in with the language. @AmazingMech2418

TheDrone7

Standard library is totally fine. @AtriDey

DynamicSquid

@TheDrone7 ah, cool, thanks

BenjaminUrquhar

Everyone's doing double division. Be more creative smh.

CodingCactus

@BenjaminUrquhar it's the fastest way to solve the problem, would you ever want a slow function in your program if you can have a fast one that does the same thing?

AdCharity

@BenjaminUrquhar smh but in ruby you can divide by zero so it's perfect

BenjaminUrquhar

@CodingCactus I'm not going for efficiency. If I was I'd just use the multiplication operator directly.

AmazingMech2418

@BenjaminUrquhar I personally prefer string-based math for this one...

PYer

Here's my submission! https://repl.it/talk/share/Multiply-WEEKLY-Usage-of-math-module/36174 I think its unique! YAY!

bramley

sounds fun epic ngl

CodingCactus

done it!

Coder100

nice

RohilPatel

Cooll

Coder100

big brain time @RohilPatel

RohilPatel

I have a sneaky plan, and it'll work.... use ur math @Coder100

AgastyaSandhuja

very big @Coder100

Coder100

lmfao i alread y finsihed @RohilPatel

Coder100

lmfao i did it! here @AgastyaSandhuja

AgastyaSandhuja
Coder100
RohilPatel
RohilPatel

I posted mine. Look at it lmao @Coder100

Coder100
RohilPatel

It's on share. I'll dm u link on discord
@Coder100

Codemonkey51

Hrmmm

PYer

Sounds fun!

AdCharity

que