Zoba the Misleader
Zoba has 3 strings, named S1​, S2​ and S3​. He wanted to make a tough problem for Mihaf with these s...
Bad XOR 2 (Hard)
So after successfully becoming many people's nightmare, XOR has struck again, this time to haunt you...
Kingdom of Equality
There is a kingdom called DomKi. There are N cities and N – 1 bidirectional roads in DomKi. The citi...
Preparing for War
There were N cities in England. Each contained a warrior with skillset equal to X. All the cities we...
Road Minister Techboy
Techboy is appointed as the minister of roads and highway in his country Better-Not-Name-It. Now he ...
Zer VS EEE
Zer is a programmer who has a friend named Nir. Nir always shows off how great EEE is. One day Nir c...
Directed Rectangle
Sami has just finished his assignments, to relax, he wants to play games. Since he’s banned from PUB...
Scary Tree
Recently Alex has been learning about the tree data structure. And, he has been struggling to write ...
Spreadsheet v1
Are you trying to find a problem that is easy to solve? Even if it involves writing a lot of code? T...
Kingdom of Code
Kingdom CODE is the most peaceful place in the universe. King NOVOSH and Queen ALMIDA is ruling this...
Birthday Gifts
Today is Luke's birthday. Mr. Phil Dunphy (Luke's father) has thrown a birthday party for him and de...
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
Counting Friends
Johnny uses a social network called Supernova. Unlike the other social networks, Supernova does not ...
Haunting of Herobrine
Herobrine's horror stories are known by many, but only a few dares to speak that name out loud, for ...
Marbles Per Second
You have a rooted tree of n nodes. If we traverse the tree from the root, let’s say the traversing o...
Lets Play Pipeline
In this problem you will have to solve a puzzle game named "Pipeline". 90's kids knows this game ver...
The Archipelago of Mirpur
The archipelago of Mirpur consists of N islands. The famous architect PogPog was hired to connect al...
Village Fair 2
There are N houses in a village far away from here. They are numbered from 1 to N. For this problem ...
Simple And
You are given a tree containing $N$ nodes. The nodes are numbered from $1$ to $N$. The root node of ...
Darth Vader and 3PO on a Tree!
Did you watch Star Wars yet? No? You should in your free time. Now back to Darth Vader and 3PO. Dart...
Explosion
There is a house named Larcana. It is a very weird house. There are exactly N rooms in total and bet...
MonoMono
You have probably heard of the famous board game, Monopoly. According to Wikipedia, in this game, pl...
Birthday Present?!
As everyone gifts graphs or strings to people on their birthdays, Oyshee’s friends decided to do som...
Big Bang Theory
Dr. Sheldon Cooper is working on a project that works on the 2D concept of the universe. In this pro...
Nilkhet
You’re planning to start a library for the next n days, where you will rent books to students. Each ...
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