Codeforces

Mar 30, 2025 • Codeforces

112A Petya and Strings

Little Petya loves presents. His mum bought him two strings of the same size for his birthday

May 16, 2025 • Codeforces

Splits

Let's define a split of n as a nonincreasing sequence of positive integers, the sum of which is n

May 30, 2025 • Codeforces

Dice Rolling

Mishka got a six-faced dice. It has integer numbers from 2 to 7 written on its faces

Apr 11, 2025 • Codeforces

Anton and Fairy Tale

Anton likes to listen to fairy tales, especially when Danik, Anton's best friend, tells them. Right now Danik tells Anton a fairy tale.

May 03, 2025 • Codeforces

Year of University Entrance

There is the faculty of Computer Science in Berland. In the social net "TheContact.

May 25, 2025 • Codeforces

Maxim Buys an Apartment

Maxim wants to buy an apartment in a new house at Line Avenue of Metropolis.

May 02, 2025 • Codeforces

Diagonal Walking

Mikhail walks on a 2D plane. He can go either up or right. You are given a sequence of Mikhail's moves. He thinks that this sequence is too long and he wants.

Mar 29, 2025 • Codeforces

2490. Circular Sentence

A sentence is a list of words that are separated by a single space with no leading or trailing spaces

Apr 03, 2025 • Codeforces

379A New Year Candles

Vasily the Programmer loves romance, so this year he decided to illuminate his room with candles

Jun 18, 2025 • Codeforces

Definite Game

Chouti was doing a competitive programming competition.

Jun 04, 2025 • Codeforces

Splits

Let's define a split of n as a nonincreasing sequence of positive integers, the sum of which is n

May 29, 2025 • Codeforces

File Name

You can not just take the file and send it. When Polycarp trying to send a file in the social network.

Apr 07, 2025 • Codeforces

118A String Task

There are n stones on the table in a row, each of them can be red

Jun 29, 2025 • Codeforces

LCM

Ivan has number b He is sorting through the numbers a from 1

Apr 12, 2025 • Codeforces

Polycarp and Letters

Polycarp loves lowercase letters and dislikes uppercase ones. Once he got a string s consisting only of lowercase and uppercase Latin letters.

Mar 25, 2025 • Codeforces

Swap Game

Alice and Bob are playing a game on an array a of n positive integers

May 07, 2025 • Codeforces

Bear and Different Names

In the army, it isn't easy to form a group of soldiers that will be effective on the battlefield. The communication is crucial and thus no two soldiers should

May 31, 2025 • Codeforces

Disturbed People

There is a house with n flats situated on the main street of Berlatov.

Jun 25, 2025 • Codeforces

Birthday

Ivan is collecting coins. There are only N different collectible coins, Ivan has K of them

May 19, 2025 • Codeforces

Paper Airplanes

To make a paper airplane, one has to use a rectangular piece of paper. From a sheet of standard size you can make s airplanes.

May 22, 2025 • Codeforces

Find Amir

A few years ago Sajjad left his school and register to another one due to security reasons. Now he wishes to find Amir, one of his schoolmates and good friends.

Jun 19, 2025 • Codeforces

Got Any Grapes

For simplicity, we'll assume that there are only three types of grapes: green grapes, purple grapes and black grapes.

Mar 26, 2025 • Codeforces

1742C -Stripes

On an 8×8 grid, some horizontal rows have been painted red, and some vertical columns have been painted blue

Apr 28, 2025 • Codeforces

Equal Sums

You are given k sequences of integers. The length of the i-th sequence equals to ni .

Jun 28, 2025 • Codeforces

Badge

In Summer Informatics School, if a student doesn't behave well, teachers make a hole in his badge. And today one of the teachers caught a group of n students

May 17, 2025 • Codeforces

Maximize Sum of Digits

Anton has the integer x. He is interested what positive integer, which doesn't exceed x, has the maximum sum of digits.

Jun 15, 2025 • Codeforces

Chess For Three

Alex, Bob and Carl will soon participate in a team chess tournament.

May 04, 2025 • Codeforces

Commentary Boxes

Berland Football Cup starts really soon! Commentators from all over the world come to the event.

May 11, 2025 • Codeforces

Mister B and Book Reading

Mister B once received a gift: it was a book about aliens, which he started read immediately. This book had c pages.

May 15, 2025 • Codeforces

Hit the Lottery

Allen has a LOT of money. He has n dollars in the bank

Jun 10, 2025 • Codeforces

Cloning Toys

Recently, he found a machine that can clone plush toys

Apr 08, 2025 • Codeforces

Soldier and Bananas

A soldier wants to buy w bananas in the shop. He has to pay k dollars for the first banana.

Apr 23, 2025 • Codeforces

Key races

Two boys decided to compete in text typing on the site "Key races". During the competition, they have to type a text consisting of s characters

Apr 14, 2025 • Codeforces

Neverending competitions

There are literally dozens of snooker competitions held each year, and team Jinotega

Jun 16, 2025 • Codeforces

Packets

You have n coins, each of the same value of 1.

Jun 27, 2025 • Codeforces

QAQ

QAQ" is a word to denote an expression of crying. Imagine "Q" as eyes with tears and "A" as a mouth.

Jun 08, 2025 • Codeforces

Numbers on the Chessboard

You are given a chessboard of size n×n It is filled with numbers from 1 to n2

Apr 09, 2025 • Codeforces

Petya and Strings

Little Petya loves presents. His mum bought him two strings of the same size for his birthday

Jun 06, 2025 • Codeforces

Heist

There was an electronic store heist last night.

Mar 30, 2025 • Codeforces

427 Prison Transfer

The prison of your city has n prisoners. As the prison can't accommodate all of them, the city mayor has decided to transfer c of the prisoners to a prison.

May 08, 2025 • Codeforces

Fraction

Petya is a big fan of mathematics, especially its part related to fractions.

May 27, 2025 • Codeforces

New Year and the Christmas Ornament

Alice and Bob are decorating a Christmas Tree.

Apr 24, 2025 • Codeforces

3 Palindrome

In the beginning of the new year Keivan decided to reverse his name. He doesn't like palindromes, so he changed Naviek to Navick.

Jun 22, 2025 • Codeforces

The Monster

A monster is chasing after Rick and Morty on another planet. They're so frightened that sometimes they scream

May 05, 2025 • Codeforces

Kuro and Walking Route

Kuro is living in a country called Uberland consisting of n towns, numbered from 1 to n and n−1 bidirectional roads connecting these towns

Jun 18, 2025 • Codeforces

Elections

Elections are taking place in Berland. There are n candidates participating in the elections, numbered from 1 to n

Apr 26, 2025 • Codeforces

Shell Game

Bomboslav likes to look out of the window in his room and watch lads outside playing famous shell game.

May 14, 2025 • Codeforces

Borya's Diagnosis

It seems that Borya is seriously sick. He is going visit n doctors to find out the exact diagnosis

Apr 06, 2025 • Codeforces

266B Queue at the School

During the break the schoolchildren, boys and girls, formed a queue of n people in the canteen.

Jun 09, 2025 • Codeforces

Between the Offices

As you may know, MemSQL has American offices in both San Francisco and Seattle

Apr 13, 2025 • Codeforces

A Serial Killer

Sherlock is currently trying to catch a serial killer who kills a person each day.

Apr 17, 2025 • Codeforces

Game With Sticks

After winning gold and silver in IOI 2014, Akshat and Malvika want to have some fun. Now they are playing a game on a grid made of n horizontal and m vertical.

May 06, 2025 • Codeforces

Kirill And The Game

Kirill plays a new computer game. He came to the potion store where he can buy any potion. Each potion is characterized by two integers

Apr 16, 2025 • Codeforces

Mahmoud and a Triangle

Mahmoud has n line segments, the i-th of them has length ai. Ehab challenged him to use exactly 3 line segments to form a non-degenerate triangle.

Mar 19, 2025 • Codeforces

Problem - 239A Two Bags of Potatoes

Valera had two bags of potatoes, the first of these bags contains x (x ≥ 1) potatoes.

Jun 01, 2025 • Codeforces

Water Lily

While sailing on a boat, Inessa noticed a beautiful water lily flower above the lake's surface

Mar 18, 2025 • Codeforces

Problem - 231A

One day three best friends Petya, Vasya and Tonya decided to form a team and take part in programming contests.

Jun 14, 2025 • Codeforces

Function Height

The given points are vertices of a plot of a piecewise function. The j-th piece of the function is the segment PjPj+1

May 26, 2025 • Codeforces

Greedy Arkady

k people want to split n candies between them. Each candy should be given to exactly one of them or be thrown away.

Jun 05, 2025 • Codeforces

Wrong Subtraction

Little girl Tanya is learning how to decrease a number by one

Apr 19, 2025 • Codeforces

Jon Snow and his Favourite Number

Jon Snow now has to fight with White Walkers. He has n rangers, each of which has his own strength.

Apr 15, 2025 • Codeforces

Timofey and cubes

Young Timofey has a birthday today! He got kit of n cubes as a birthday present from his parents

May 20, 2025 • Codeforces

Beautiful Divisors

Recently Luba learned about a special kind of numbers that she calls beautiful numbers.

Jun 21, 2025 • Codeforces

Okabe and Banana Trees

Okabe needs bananas for one of his experiments for some strange reason. So he decides to go to the forest and cut banana trees.

Apr 10, 2025 • Codeforces

Taymyr is calling you

Comrade Dujikov is busy choosing artists for Timofey's birthday and is recieving calls from Taymyr from Ilia-alpinist.

Apr 04, 2025 • Codeforces

27A Next Test

«Polygon» is a system which allows to create programming tasks in a simple and professional way.

May 01, 2025 • Codeforces

Fake NP

Tavak and Seyyed are good friends. Seyyed is very funny and he told Tavak to solve the following problem instead of longest-path.

Apr 27, 2025 • Codeforces

Arya and Bran

Bran and his older sister Arya are from the same house. Bran like candies so much, so Arya is going to give him some Candies

Apr 18, 2025 • Codeforces

Timofey and cubes

Young Timofey has a birthday today! He got kit of n cubes as a birthday present from his parents.

Jun 02, 2025 • Codeforces

Pizza, Pizza, Pizza!!!

Katie, Kuro and Shiro are best friends. They have known each other since kindergarten

May 28, 2025 • Codeforces

Polycarp's Pockets

Polycarp has n coins, the value of coin is Polycarp wants to distribute all the coins between his pockets

Jun 03, 2025 • Codeforces

Piles With Stones

There is a beautiful garden of stones in Innopolis.

Mar 17, 2025 • Codeforces

Problem - 158B Taxi

After the lessons n groups of schoolchildren went outside and decided to visit Polycarpus to celebrate his birthday. We know that the i-th group consists

Apr 26, 2025 • Codeforces

Problems in your to-do list

CodeChef recently revamped its practice page to make it easier for users to identify the next problems they should solve by introducing some new features.

May 10, 2025 • Codeforces

If at first you don't succeed

Each student eagerly awaits the day he would pass the exams successfully

Apr 02, 2025 • Codeforces

478A Initial Bet

There are five people playing a game called "Generosity

Jun 07, 2025 • Codeforces

Chips Moving

You are given n chips on a number line. The i-th chip is placed at the integer coordinate

May 21, 2025 • Codeforces

Magic Forest

Imp is in a magic forest, where xorangles grow (wut?)

May 18, 2025 • Codeforces

Diagonal Walking

Mikhail walks on a 2D plane. He can go either up or right. You are given a sequence of Mikhail's moves. He thinks that this sequence is too long and he wants.

Jun 23, 2025 • Codeforces

Trailing Loves (or L'oeufs?)

Aki is fond of numbers, especially those with trailing zeros

Jun 26, 2025 • Codeforces

Odds and Ends

Where do odds begin, and where do they end? Where does hope emerge, and will they ever break?

Jul 01, 2025 • Codeforces

Unique Bid Auction

There is a game called "Unique Bid Auction". You can read more about it here

Jun 12, 2025 • Codeforces

Love Triangle

As you could know there are no male planes nor female planes. However

Apr 01, 2025 • Codeforces

266A Stones on the Table

There are n stones on the table in a row, each of them can be red, green or blue

Apr 05, 2025 • Codeforces

4C Registration system

A new e-mail service "Berlandesk" is going to be opened in Berland in the near future

Jun 13, 2025 • Codeforces

Coins

In Berland, there are two types of coins, having denominations of 2and k burles

May 13, 2025 • Codeforces

Mahmoud and Ehab and the even-odd game

Mahmoud and Ehab play a game called the even-odd game. Ehab chooses his favorite integer n and then they take turns

Jun 11, 2025 • Codeforces

Benches

There are n benches in the Berland Central park. It is known that a people are currently sitting on the bench

May 12, 2025 • Codeforces

Chess For Three

Three friends gathered to play a few games of chess together

May 24, 2025 • Codeforces

Adjacent Replacements

Mishka got an integer array a of length n as a birthday present (what a surprise!).

Mar 29, 2025 • Codeforces

1734 Select Three Sticks

You are given n sticks with positive integral length a1,a2

Jun 30, 2025 • Codeforces

Pizza, Pizza, Pizza

Katie, Kuro and Shiro are best friends. They have known each other since kindergarten

May 23, 2025 • Codeforces

Equator

Polycarp has created his own training plan to prepare for the programming contests. He will train for n days, all days are numbered from 1 to n beginning

May 09, 2025 • Codeforces

Hamster Farm

Dima has a hamsters farm. Soon N hamsters will grow up on it and Dima will sell them in a city nearby.

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