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...

Reverse The Magic

You are probably familiar with the technique of representing a T...

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...

Spanning Tree

There are N nodes in a tree. You can start from any node of that...

How Many Ways?

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

Darth Vader and 3PO on a Tree!

Did you watch Star Wars yet? No? You should in your free time. ...

Road Minister Techboy

Techboy is appointed as the minister of roads and highway in his...

Kingdom - Great Roads of Destiny

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

Christmas Tree

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