Act of Random Kindness (Hard)

Sammy and Meera liked adventures a lot. Once in a while they use...

Village Fair 2

There are N houses in a village far away from here. They are num...

Flow on Tree

Mr. Kaboom has recently learned about maximum flow. Now his frie...

Meena Meets The Marauders

December 14, 1975 Hogwarts School of Witchcraft and Wizardry I...

Sofdor Ali's Black and White Tree

Sofdor Ali loves Computer Science. He prefers hexadecimal number...

How Many Ways?

Regular problem solvers starts their journey by solving ad hoc a...

Kingdom - Great Roads of Destiny

Shin wants to be the “Great General of the Heaven”. It is his dr...

Bad XOR 2 (Hard)

So after successfully becoming many people’s nightmare, XOR has ...

Kingdom of Code

Kingdom CODE is the most peaceful place in the universe. King NO...

Flyover in Twinland

Rio has become the president of Twinland. Now he wants to develo...

Ghosh vs Datta

About two hundred years ago, a serious dispute evoked between th...

Keep Moving

Balurmath is a city which has N interesting tourist spots, which...

Circuit Breaker

In your free time, you like to design various electrical circuit...

Traveling Policy of Ajobdesh

In Ajobdesh, there are multiple cities and one of them is consid...

War in the Wizarding World

There is a deadly war going on between two countries (Bitland an...

A Boring Game

Alice and Bob are playing a game with a tree with n nodes. Alice...

Gold Mines

The city of gridland is a grid with n rows and m columns. The ci...

Christmas Tree

Professor Rio has an amazing Christmas tree. Unlike other trees,...

Big Bang Theory

Dr. Sheldon Cooper is working on a project that works on the 2D ...

The Spy Cats

After Max and Alexis’s initial plan to conquer the world with ki...