How Many Ways?
Regular problem solvers starts their journey by solving ad hoc and number theory. After getting the ...
Identify the Level
Amin and Belal are two friends. Both have good knowledge about graph and tree in data structure part...
Itsy's Magic Cards
Itsy needs your help with her magic cards. Her magic cards grant her special spider-witch powers. Un...
Meena Meets The Marauders
December 14, 1975 Hogwarts School of Witchcraft and Wizardry It’s been a long long day. The Marauder...
Plant Trees, Save Life
There are n students in a school. Some of them are friends with each other. You want to make the sch...
COVID-19 Outbreak
COVID-19 outbreak in Atlantis is so bad that the government is forced to lock down the whole country...
I Hate Long Description
There are N cities in the country AjobDesh and M one way roads connecting the cities. There lives ex...
Traveling Policy of Ajobdesh
In Ajobdesh, there are multiple cities and one of them is considered as the capital city. Obviously,...
A Boring Game
Alice and Bob are playing a game with a tree with n nodes. Alice always plays first, and the two pla...
Fortis Fortuna Adiuvat
Your very close friend, John, also known as the Baba Yaga, is often on various missions to complete ...
Keep Moving
Balurmath is a city which has N interesting tourist spots, which are connected between themselves by...
Taofiq the House Prefect
Tomorrow is a very special day for Taofiq. He is participating in an intra school quiz contest. As h...
MEXimum
Let’s get straight to the point. You are given a tree. In the tree, each node u has a number au​ ass...
Set the Meeting
Three colleagues Motu, Biscuit and Ramjan are in Sundarbans now. They are on a mission to protect th...
Tree Queries
You are given a tree of n vertices. Each vertex contains an integer. Vertex 1 is the root of the tre...
Hidden Graph
There is an unweighted, undirected hidden graph. You are given an integer range from L to R. There a...
Concatenation of Perfect Squares
You are given a positive integer number. You have to determine whether this number can be represente...
Directed Rectangle
Sami has just finished his assignments, to relax, he wants to play games. Since he’s banned from PUB...
Sayadpur City
Bob wants to visit a new country called sayadpur. There are N cities (1,2,3,…,N) in sayadpur, and th...
Spanning Tree
There are N nodes in a tree. You can start from any node of that tree and you have to come back to t...
Graph Moderate 80/86/125
Sofdor Ali's Black and White Tree
Sofdor Ali loves Computer Science. He prefers hexadecimal number system to decimals, just because it...
Scarlet Speedster
The scarlet speedster of Central City, popularly known as the Flash is fighting an epic battle again...
Counting Friends
Johnny uses a social network called Supernova. Unlike the other social networks, Supernova does not ...
Tahsin and Tree
Tahsin loves graph theory very much. He is especially fond of trees. For his upcoming birthday his f...
Act of Random Kindness (Hard)
Sammy and Meera liked adventures a lot. Once in a while they used to set out adventures. This time t...
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