Milad's Lost Tree
Milad likes trees so much. He has a rooted tree with $n$ vertices each of which has some non-negativ...
Game of Palindromes
In a popular computer game, Game of Palindromes also known as GOP there is a city called Palindesh. ...
Burger King
Every day, more than 11 million guests visit BURGER KING® restaurants around the world. And they do ...
Maximum Sum
Little Jimmy loves to play with numbers. One day he was playing with a number sequence. In his game,...
Penguins of Madagascar
One day the penguins of Madagascar found a string S... Wait... Wait. Actually the setter of the prob...
Alice in Candyland
Alice came up with a new game. In this game called "Candy Quest", there is a NxN size 2D grid. In ea...
The Perfect Collection
Given an array A of N integers, if we choose any K of these integers and calculate their bitwise XOR...
LIDS
We all know about LIS (Longest Increasing Sub sequence). The task to find the length of the longest ...
Very Dirty String
Strings are difficult, most of the contest programmers say this and try to avoid string algorithms. ...
Easy Sequence 1
Let’s define an easy sequence F. Where: F(1)=1 F(2X)=F(X)2+1 F(2X+1)=F(X)×F(X+1)+2 Here X is a posit...
Smart Feature Phone 2
Alice worked in CIA. Right now he need to send an encrypted message to the headquarter(HQ) of CIA. ...
Counting Murgis
Ever since that wicked thief took away some of her murgis (hens, that is), Meena was ever anxious th...
Harry Potter and the Vault of Gringotts
"There was a break-in of Gringotts Wizarding Bank on 1 May, 1998, during the height of the Second Wi...
Gaaner Koli
The protagonists of this problem are two great programmers of a certain institution Omanush and Ordi...
Subarray Sum
You are given an array having N integers. You have to select at most K positions in the array and re...
OCD Returns!
This problem author has OCD (obsessive–compulsive disorder). One day his teacher gave him an array o...
Sticking Pins
You are sticking pins on a 2D board at N given coordinates. However, since you are not very good at ...
Orchid Division
Quido has a square orchard full of various fruit and nut trees. The trees are planted in regular row...
Third Dimension
Mr. J wants to learn about combinatorics. He started reading a book on combinatorics and came across...
Happiness
If you have a Tk 100 in your wallet, what would you do? You might have couple of ways to spend that ...
Paying Bills
Mued is finally home for summer vacation after surviving yet another semester of the mighty CS Under...
Easy Sequence 2
Let’s define a easy sequence F. Where $ F(1) = 1 $ $ F(2X) = F(X)^2 + 1 $ $ F(2X+1) = F(X) \times F(...
Dominoes Forever
Once when I was little, my father took me to a tobacco shop! It is surprising, but true. He asked th...
Perseus and The New Challenge
The life of princess Andromeda, the daughter of King Cepheus and Queen Cassiopeia of Ados, is in dan...
Polygon Construction (Hard)
Meera in going to picnic with her friends. They are going to have lots of fun. They will be doing va...
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