Nearly ILLEGAL tips to improve your codeforces rating! | #1: Sample Cases

[@rashidaziz2215]

Whenever I use guess these 50% of it comes WA on test case 2

[@tarunvyshnav2533]

Relatable 😂🥲

[@_aka5h]

And this is how I became Candidate Master
from Master

[@vishalplayzz2580]

Lmao

[@shivamchauhan029nitjsr4]

🤣🤣

[@eliskam1150]

Nice video and amazing animation, keep up the work!
I use this "trick" myself quite often.

[@mistake10449]

helped me in recent edu B problem 😁😁

[@aldrinsaurovsarker5159]

In the second problem, if k is a prime number, then there is no solution. So, a one-liner doesn't always work.

[@TeslasMoustache419]

I don't get it? Let's sub x = k -1. We get (k-1)! + (k-2)! which equals k*(k-2)!, i.e. it's a multiple of k.

[@multi10801]

it works, consider k = 2
substitute x = k - 1 (i.e. x = 1)
1! + (1 - 1)! = 1! + 0!
1! = 1, 0! = 1
1 + 1 = 2 -> divisible by k.
and for other values of k, which are odd, if it is a prime number, x is always -1.

[@vitaminprotein325]

I also solved both this questions seeing the test cases, without proving 😅

[@ashersamuel958]

0:58 is literally me with every question

[@rsKayiira]

Great video, just started my CF journey and currently newbie. Whats your CF rating if you dont mind me asking

[@fragadmsc]

awesome video, thanks

[@mohammedsamir5142]

This may work only in problems of level < 1000... Both examples you provided were Codeforces Div2 A problems.
Harder problems require more observations and thinking.

[@beaconcodes]

Hi - yeah I realize this, I was trying to give tips for people struggling in the easier questions so that they can solve them easier. Thanks though!

[@random_memes009]

@@beaconcodes yes but try to tell that this trick work for A level ques or B level .
BTW thanks for the video

[@webblyy]

pretty good tip for fast-solve, that provides you the opportunity to take a higher place in standings

[@KelinZhu]

Typedb round, problem E is a 2100 rated problem that can be guessed from samples

[@mohammedsamir5142]

@@KelinZhu 😦 I didn't participate in it, but this is weird that problem C was dp and hard for many intelligent people and E is that easy.

[@Negijicoder]

i didn't see the sol let's see if it's correct or not: my idea is: if n is odd then there is no answer: and if n is even then always ans should be: like (1,n/2) by solving equations..

[@tarunteja5575]

really found this helpful
nice work man keep on going
never comeback

[@usay_5317]

You gave me the easiest ways to hack those who solved such problems.

[@android5626]

brilliant!

[@shivamchauhan029nitjsr4]

I know It works but There's no way someone can reach > 1200 using these 'tricks' though.
Stop using thumbnail of this Rating Graph please. :(

[@iDabbl]

beacon orz

[@mannythebuilderrr]

south african?

[@MrKB_SSJ2]

WTH BRO :]