Subarray Sum

You are given an array having N integers. You have to select at most K positions in the array and re...

Very Dirty String

Strings are difficult, most of the contest programmers say this and try to avoid string algorithms. ...

Video Game

Shefin is playing a game. In this game there are N buildings numbered from 1 to N. Each building has...

String Is Not That Easy

Let’s consider a string S which is obtained by concatenating the non-negative integers from 0 to 102...

Maximum Sum

Little Jimmy loves to play with numbers. One day he was playing with a number sequence. In his game,...

Counting Murgis

Ever since that wicked thief took away some of her murgis (hens, that is), Meena was ever anxious th...

My Small Number

You are given two integers N and M. Find another integer X divisible by M that has the same number ...

MSIS!

Do you know what MSIS is? MSIS is the abbreviation for Maximum Sum Increasing Subsequence. It is a ...

Remember-Remainder

Zarin is a sadist. She loves to give problems to her close people. Today she gives you an array cons...

Passwords

Alice wants to extract some passwords from a random string. A password can have any number of charac...

Problem Setter Crisis

Competitive Programming is very popular in Leading University. There are many great achievements of ...

Convert String Into Palindrome

A palindrome is a word, number, phrase, or other sequence of characters which reads the same backwar...

Buildings

There are n buildings in a row. The height of the i’th building is hi. You have ৳k. It is the amoun...

Flow on Tree

Mr. Kaboom has recently learned about maximum flow. Now his friend Mr. Taboom gave him this problem....

Polygon Construction (Hard)

Meera in going to picnic with her friends. They are going to have lots of fun. They will be doing va...

Third Dimension

Mr. J wants to learn about combinatorics. He started reading a book on combinatorics and came across...

No GCD

You are given N integers. Each integer is square free (i.e. it has no divisor which is a square numb...

OCD Returns!

This problem author has OCD (obsessive–compulsive disorder). One day his teacher gave him an array o...

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) \time...

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...

The Game of Rocks

Alice and Bob have come up with a new game. Bob gives Alice a NxM grid that contains N rows and M c...

Gaaner Koli

The protagonists of this problem are two great programmers of a certain institution Omanush and Ordi...

Flyover in Twinland

Rio has become the president of Twinland. Now he wants to develop his country to fulfill his promise...

The Perfect Collection

Given an array A of N integers, if we choose any K of these integers and calculate their bitwise XOR...

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. Dar...

Sticking Pins

You are sticking pins on a 2D board at N given coordinates. However, since you are not very good at ...

Smart Feature Phone 2

Alice worked in CIA. Right now he need to send an encrypted message to the headquarter(HQ) of CIA....

Perseus and The New Challenge

The life of princess Andromeda, the daughter of King Cepheus and Queen Cassiopeia of Ados, is in dan...

Diagonal Sum

Given an N*N size matrix, you have to re-arrange the elements of the matrix in such a way that the d...

Dominoes Forever

Once when I was little, my father took me to a tobacco shop! It is surprising, but true. He asked th...

Pathetic Interview II

You all know about the story of Pathetic Interview-I. Today, I am sharing a story of my close friend...

Road Minister Techboy

Techboy is appointed as the minister of roads and highway in his country Better-Not-Name-It. Now he ...