We invite you to participate in CodeChef’s Starters 20, this Wednesday, 15th December, rated for Div 3 coders.

Time: 8 PM — 11 PM IST

Joining me on the problem setting panel are:

Setters: Utkarsh Utkarsh.25dec Gupta, Akshit akshitm16 Monga, Manuj DarkSparkle Nanthan, Ansh unknown0711 Gupta, Srikkanth srikkanthr R, Nishan Retarded_Ape Singh, Aryan Aggu_01000101 Agarwala

Testers: Aryan aryanc403 C

Statement Verifier: Nishank IceKnight1093 S

Editorialist: Ajit ajit Sharma

Contest Admin: Utkarsh Utkarsh.25dec Gupta, Daanish Mahajan

The video editorials of the problems will be available on our YouTube channel as soon as the contest ends. Subscribe to get notifications about our new editorials.

Also, if you have some original and engaging problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.

Hope to see you participating.

Good Luck!

Contest starts in 15 minutes!

Can someone give me hints for Finding Pairs?

https://www.codechef.com/START20A/problems/VKMPAIRS

Overall a nice problem set, I liked Weird values and Brutal XORs problem.

Let A[i] be x and A[i] xor B[j] be y .

So (x*y)%p=1%p

Since y<p , so y=(x^(-1))%p

`y=(x^(-1))%p`

What is this rule called ?Multiply both sides by x^(-1) ,

(y*x*(x^(-1)))%p=(x^(-1))%p