Cash Change
You have an unlimited number of cash notes of the following denominations: 1, 5, 10, 50, 100, 500. G...
Passwords
Alice wants to extract some passwords from a random string. A password can have any number of charac...
Hardest Problem Ever
Prof.Dr.DP is very famous professor. He is expert (actually legendary grandmaster) in Dynamic Progra...
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) \times F...
Make It Big!
You are given a number N (10 ≤ N ≤ 2×109). You have to perform exactly two swap operation. You can c...
Jontrona!
Isfan vai is on high demand nowadays. You know why, right? However, his best friend is somewhat disa...
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...
Subarray Sum
You are given an array having N integers. You have to select at most K positions in the array and re...
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...
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 ...
Maximum Sum
Little Jimmy loves to play with numbers. One day he was playing with a number sequence. In his game,...
Third Dimension
Mr. J wants to learn about combinatorics. He started reading a book on combinatorics and came across...
Orchid Division
Quido has a square orchard full of various fruit and nut trees. The trees are planted in regular row...
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...
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...
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