XOR Tree
You are given a tree with N vertices. A tree is a connected undirected graph without cycles. The tre...
Circuit Breaker
In your free time, you like to design various electrical circuits to give a hard time to your local ...
Tasks
Zico is a fan of Artificial Intelligence (AI). So he is doing a course on AI and even likes the teac...
Kingdom - Great Roads of Destiny
Shin wants to be the “Great General of the Heaven”. It is his dream. But becoming a “Great General o...
Scary Tree
Recently Alex has been learning about the tree data structure. And, he has been struggling to write ...
Concatenation of Perfect Squares
You are given a positive integer number. You have to determine whether this number can be represente...
Bad XOR 2 (Hard)
So after successfully becoming many people's nightmare, XOR has struck again, this time to haunt you...
Lets Play Pipeline
In this problem you will have to solve a puzzle game named "Pipeline". 90's kids knows this game ver...
COVID-19 Outbreak
COVID-19 outbreak in Atlantis is so bad that the government is forced to lock down the whole country...
Sayadpur City
Bob wants to visit a new country called sayadpur. There are N cities (1,2,3,…,N) in sayadpur, and th...
Village Fair 2
There are N houses in a village far away from here. They are numbered from 1 to N. For this problem ...
MonoMono
You have probably heard of the famous board game, Monopoly. According to Wikipedia, in this game, pl...
The Spy Cats
After Max and Alexis's initial plan to conquer the world with kitten armies failed, they started a n...
Set the Meeting
Three colleagues Motu, Biscuit and Ramjan are in Sundarbans now. They are on a mission to protect th...
Flow Finder
Last summer, Carla the Cartographer went on an expedition on behalf of the National Center for Posit...
DFS, Flow Moderate 8/12/88
Hasan the Treasure Hunter
Benjamin Gates the treasure hunter opened a coaching center named Khajna Dibo Na where he teaches hi...
Pretty Diabolical
TRAOMBINNAA is going to be Billy Butcher's base for the next season of the boys. He is going to buil...
Zoba the Misleader
Zoba has 3 strings, named S1​, S2​ and S3​. He wanted to make a tough problem for Mihaf with these s...
T5 Racing
It is high time for the annual T5 racing and your team is planning to win the race. In T5 racing the...
MangoSmash
Your friend has come to visit the RUET campus. As the Mango season goes on ⋯, he/she said “Mama Aam ...
Big Bang Theory
Dr. Sheldon Cooper is working on a project that works on the 2D concept of the universe. In this pro...
Hide and Seek
You know how to play hide-and-seek, right? In a group of kids, one of them is selected to be the see...
War in the Wizarding World
There is a deadly war going on between two countries (Bitland and Byteland) in the wizarding world. ...
Change Queries
Today is a very special day for Rubel. Recently he got a job in a software company. Now today is the...
Unfair Robot Race
Two teams of robots, Team A and Team B, are racing in a 2D grid. There will be a total of 6 rounds. ...
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