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Bitcoin Toss Description: But, Yraglac has an idea; no, it does not include tossing virtual coins, the problem title is misleading in that sense. Instead, he will print out all the possible outcomes of tosses of $N$ coins (as a string of Tails and Heads), put them into a hat and get someone to draw...
26,500
Bitmask Description: Masking greatly reduces the transmission of certain viruses. This is true for computer viruses as well. In order to protect binary data from infection, we must cover it up with masks! Binary data can be represented as a string of $n$ $0$s and $1$s. A bitmask can be used to cover a por...
26,501
Bitonic Ordering Description: Noah suggests the following card game: You are given a deck of cards, each with a distinct positive integer value written on it. The cards are shuffled and placed in a row. Your objective is to arrange the cards in the row so that the values are monotonically increasing in...
26,502
Bits Description: As we all know, it takes more energy to store binary numbers with lots of ones in them. Yraglac’s calculator has some batteries that are almost dead, and he’s concerned that the battery may run out as he types in a number. The way the calculator processes numbers being entered is as ...
26,503
Bits Equalizer Description: You are given two non-empty strings $S$ and $T$ of equal lengths. $S$ contains the characters ‘0’, ‘1’ and ‘?’, whereas $T$ contains ‘0’ and ‘1’ only. Your task is to convert $S$ into $T$ in minimum number of moves. In each move, you can * change a ‘0’ in $S$ to ‘1’, *...
26,504
Bitte ein Bit Description: The city of Bitburg in Rhineland–Palatinate, Germany, is home to the Bitburger Brewery founded in 1817. Since 1951, the company slogan is, “Bitte ein Bit,” literally, “A Bit, please.” Given some bits, output one of them. ## Input The input consists of a single line of $n$ bits...
26,505
Bitwise Description: Barr the Bear is playing the game Bits with Swanky Shen! Bits is a very simple game. At the start, a circle of $N$ non-negative integers $A_1$, $A_2$, $A_3$, $\ldots $, $A_ N$ is shown to both players. That is, to the left of the integer $A_ i$ is the integer $A_{i-1}$ if $i > 1$; and...
26,506
BizzFuzz Description: Algot was just at an interview at a software company and had to solve the classic FizzBuzz problem. It consists of printing the integers from 1 to 100, but replacing each integer divisible by 3 to "Fizz", each divisible by 5 to "Buzz" and each divisible by both to "FizzBuzz". He ...
26,507
Bið, endalaus bið Description: Svala has been waiting for forever and the wait barely shortens, it seems. She looked at the clock quite a while ago so she’s going to check what the time is. Svala doesn’t know how to read the time off a clock though, can you help her and tell her how many minutes have p...
26,508
Bjagað Beðaltal Description: At the end of every programming contest, statistics and fun facts are collected to show the contestants afterwards. Often average number of solves, or average number of tries to solve a given problem are calculated. Allegedly, someone at the statistics department said that ...
26,509
Black Friday Description: Black Friday is the Friday following Thanksgiving Day in the United States (the fourth Thursday of November). Since the early 2000s, it has been regarded as the beginning of the Christmas shopping season in the US, and most major retailers open very early and offer promotional...
26,510
Black Out Description: When you’ve finished solving all problems in this contest, there’s no need to get bored, be- cause we introduce a new and fun game called Black Out! Grab a piece of paper and draw a table of 5 by 6 squares. Next, choose your favorite teammate to play against. Each player in turn ...
26,511
Black Vienna Description: Black Vienna is a puzzle game where players try to deduce the secret identities of the three spies. There are $26$ suspects, represented by cards with a single letter from ‘A’ to ‘Z’. Suspect cards are shuffled and three are secretly set aside; these form the Black Vienna ...
26,512
Black and White Description: Black and White is a Chinese children’s game played in rounds. During each round, the children who are playing all put their hands in either face-up (“White”) or face-down (“Black”). If all the children but one make the same choice, then the “odd one out” sits out for the ...
26,513
Blackboard Numbers Description: Your maths teacher, Professor Prime, likes writing integers on the blackboard at the end of class. You have been taking notes all semester, and have noticed two things: * There is an equal chance of the number being written in binary, octal, decimal, and hexadecimal. *...
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Blacksmith Training Description: Zapray is playing the game World of Warcraft Classic. In the game he needs to train his blacksmith skill from level $0$ to level $300$. He will improve his blacksmith skill by crafting items described in blacksmith plans. Blacksmith plans are taught by trainers around the ...
26,515
Blandað Best Description: Níels is at his favourite kebab place, KFFÍ (Kebab Fyrir Forritara á Íslandi) and now he needs to decide what type of meat he wants on his kebab. KFFÍ offers a wide range of options, a whole two different types, beef or chicken. If you are like Níels, you always prefer getting...
26,516
Blazing New Trails Description: Your state has just purchased a large, unspoiled tract of land, and wishes to turn it into a nature park with hiking trails. The land has $n$ places of interest to which guests may wish to hike, and of these, $k$ are very special. The state wishes to connect these pl...
26,517
Blaðra Description: In Forritunarkeppni Framhaldsskólanna all teams get a balloon for each problem they solve, the balloons being different colours depending on what problem was solved. This year there will be $k$ problems. Thus $k$ employees will be needed to inflate balloons. Each employee will inflate ...
26,518
Blaðra Description: The common element of birthdays and programming contests are the balloons. You have arrived to the 20 year anniversary of Forritunarkeppni Framhaldsskólanna. There you receive a really neat balloon. OH NO! You lose your grip on the balloon and it floats upwards. If you find a long...
26,519
Bless You Autocorrect! Description: The autocorrect feature on Jenny’s phone works like this: the phone has an internal dictionary of words sorted by their frequency in the English language. Whenever a word is being typed, autocorrect suggests the most common word (if any) starting with all the letters...
26,520
Bling Description: Each fruit can be sold for $100$ Bling, or planted to become a fruit tree (but not both). Every three days, starting on the third day after it was planted, a fruit tree yields three new fruits. There are also some more exotic fruits that can be bought from the neighboring village. O...
26,521
Blobs of Doom Description: The Mischievous Troublemakers’ Association (MTA) has hatched a sinister plot for world domination! All through the night, the Troublemakers work tirelessly, arranging rocks in the shape of hideous, misshapen blobs on the lawns of the unsuspecting residents of Quackville. For ...
26,522
Block Crusher Description: You are responsible for testing the compressive strength of various composite materials. You take a rectangular block, crush it from the sides and see where it beaks. This is hard work, and it’s dirty, so you decide to write a simulator to get yourself some help. Computation...
26,523
Block Game Description: You are attending the International Construction by Preschoolers Contest. Unfortunately, you are too old to participate, but you still enjoy watching the competition. In between rounds, you are walking around the contest area when you see a toddler, one of the contestants, playing ...
26,524
Blocks on Blocks Description: If you know the game tetris, you may be familiar with the following figures: These figures contains rows of squares. In each row, squares are consecutive. Adjacent rows share at least one side of a square, so the following figures are not allowed: Given the number of squares...
26,525
Blokovi Description: $N$ rectangles with given masses $m_1, m_2, \ldots , m_ N$, fixed length $l = 2$ and height $h$ are arranged in a Cartesian plane such that: * rectangle edges are parallel to the coordinate axes; * the $y$-coordinates of the lower horizontal edges are distinct and assume ...
26,526
Blooper Game Description: Mario is competing in the most important elimination game of his entire life. He has been given a dalgona cookie, which is a cookie made out of caramelized sugar, that has a shape with $N$ sides etched into its surface. He also have a sewing needle that he is using to cut ...
26,527
Blowing Candles Description: As Jacques-Édouard really likes birthday cakes, he celebrates his birthday every hour, instead of every year. His friends ordered him a round cake from a famous pastry shop, and placed candles on its top surface. The number of candles equals the age of Jacques-Édouard in ho...
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Blueberry Waffle Description: You are using a waffle maker machine to make a delicious blueberry waffle. One side of your waffle is covered in blueberries, while the other side is plain. Initially, the cooking pan of the waffle maker lies horizontally, and the blueberries are on the top side of the waf...
26,529
Bluetooth Description: King Harold of Denmark (c. 998–1098) wants to eat an apple to celebrate the founding of the town Lund. Harold’s teeth are in terrible condition; some are missing, some are rotten and discoloured, earning him the nickname “Bluetooth.” Harold can chew the apple on the left or the righ...
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BnPC Description: You are playing your favorite game, Basements and Pigeonlike Creatures, for the umpteenth time. You know the game pretty well, but you have never spent enough time on it to figure out the best strategy. That is, until now. The game consists of a certain sequence of events, such as bat...
26,531
Board Coloring Description: One day you were visiting a museum where you saw a modern piece of art that shows a grid of $N$ rows and $M$ columns. Each cell in the grid has a color, which can be one of the four: red (‘R’), green (‘G’), blue (‘B’), and white (‘W’). You think that the art is so simple so tha...
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Board Covering Description: Given a board with $M$ rows and $N$ columns. A cell at the $i^{th}$ row from the top and the $j^{th}$ column from the left is denoted by $(i, j)$. Each cell of the board is one of $3$ types: * A blocked cell. * An empty cell. * A number in range $[1, 9]$. A b...
26,533
Board Wrapping Description: The small sawmill in Mission, British Columbia, has developed a brand new way of packaging boards for drying. By fixating the boards in special moulds, the board can dry efficiently in a drying room. Space is an issue though. The boards cannot be too close, because then the...
26,534
Boastin' Red Socks Description: You have a drawer that is full of two kinds of socks: red and black. You know that there are at least $2$ socks, and not more than $50\, 000$. However, you do not know how many there actually are, nor do you know how many are red, or how many are black. You have noticed...
26,535
Boat Parts Description: Boating season is over for this year, and Theseus has parked his boat on land. Of course, the boat looks nothing like it did as of the beginning of the season; it never does. You see, Theseus is constantly looking for ways to improve his boat. At every day of the boating season, Th...
26,536
Bob Description: Little Bob is a famous builder. He bought land and wants to build a house. Unfortunately, the problem is the land’s terrain, it has a variable elevation. The land is shaped like a rectangle, $N$ meters wide and $M$ meters long. It can be divided into $N\cdot M$ squares (see the image)...
26,537
Bobby's Bet Description: Bobby and Betty have a bet. Betty bets Bobby that he cannot roll an $S$-sided die (having values $1$ through $S$) and obtain a value $\ge R$ on at least $X$ out of $Y$ rolls. Betty has a variety of dice with different numbers of sides $S$, and all her dice are fair (for...
26,538
Bocchi's Rocks Description: Bocchi has a collection of $N$ rocks of differnet weights. For each rock in her collection, Bocchi wants to know the amount of the other rocks that weigh less than the actual rock. ## Input First row consists of a single integer, $N$ $(1 \leqslant N \leqslant 2\cdot 10^5)$, am...
26,539
Bog of Eternal Stench Description: You are trying to reach the center of a Labyrinth, which means you must cross the Bog of Eternal Stench. Legend says that if you put so much as one toe in the Bog you will smell bad... forever. You would of course prefer to make it through the Bog with the minimum lev...
26,540
Boggle Description: I am sure, you are a big fan of the board game “Boggle”. Don’t worry if you are not familiar with the rules, I will explain them to you. A Boggle is a $4 \times 4$ grid of letters where your job is to find as many words as you can. If I play Boggle with (or against) my wife, she alw...
26,541
Boiling Vegetables Description: The trick to boiling vegetables is to make sure all pieces are about the same size. If they are not, the small ones get too soft or the large ones get undercooked (or both). Fortunately, you have heard of the kitchen knife, but your parents’ warnings of using sharp instr...
26,542
Bokstavstärningar Description: Klara has $N$ dices with letters written on them. Each die has a letter on each of its $K$ sides. By throwing the dice and rearranging them in some arbitrary order, you can make construct a word with $N$ letters. Write a program to count the number of valid words that ca...
26,543
Bolir Description: One of the most fun parts of competing in a programming contest is of course getting a shirt. But this year the planning committee has messed everything up…When a contestant registers for the contest they register their shirt size as well. But this data got lost so the committee inst...
26,544
Bomas Description: You are a manager of a zoo. The zoo is a collection of enclosed areas formed by circular fences (known as bomas). The bomas do not intersect nor do they touch, but they can nest. You may choose not to use all of the zoo’s areas for holding animals at a given time (to prepare for futu...
26,545
Bombardment Description: You are designing an old-school game you call Bombardment where the goal is to destroy a number of points by bombarding them. You do not yet know the theme of your game, just that the core mechanics should involve a bombardment. The points to be destroyed are located on the re...
26,546
Bona Fide Description: “Never attribute to malice that which is adequately explained by stupidity.” ­–Robert Hanlon. A well-known trendsetter from a faraway land once needed strings with certain palindromic properties for inspiration. Unable to produce them all herself, she decided to outsource the wo...
26,547
Bonbons Description: Ylva loves bonbons, probably more than anything else on this planet. She loves them so much that she made a large plate of $R \cdot C$ bonbons for her fikaraster1. Ylva has a large wooden tray which can fit $R$ rows of $C$ bonbons per row, that she will put the bonbons on. Her bon...
26,548
Bond Description: Everyone knows of the secret agent double-oh-seven, the popular Bond (James Bond). A lesser known fact is that he actually did not perform most of his missions by himself; they were instead done by his cousins, Jimmy Bonds. Bond (James Bond) has grown weary of having to distribute ass...
26,549
Bonsai Description: Many people love to grow bonsai trees because they say that it is “difficult” and “harmonious”. That’s not why Torstina grows bonsai trees. She only wants to sell them and make lots of money so she can buy lots of cherimoya. She has just planted a new nodule and is really craving ch...
26,550
Book Circle Description: A couple of computer science students have decided to start a book circle, in which they will be able to share the passion of their lives, namely reading. Finally, the first season of reading is coming to its end, and the students in the book circle are going to present their f...
26,551
Book Club Description: Porto’s book club is buzzing with excitement for the annual book exchange event! Every year, members bring their favorite book and try to find another book they like that is owned by someone willing to trade with them. I have been to this book exchange before, and I definitely d...
26,552
Book Shelves Description: You are going to buy book shelves to put all your books in. You already know how many books you have and need to count the number of book shelves required. The books have three sizes: a small book has width $1$, a medium book width $2$ and a big book width $3$. Each sh...
26,553
Booking Description: Pierre is in great trouble today! He is responsible for managing the bookings for the ACM (Accomodation with Moderate Costs) hotel and has just realized that the booking software has a severe bug. It has created overlapping and wrong room assignments. Pierre is now worried that the...
26,554
Booking a Room Description: In this problem, you should write a program to search for available rooms in a given hotel. The hotel has $r$ rooms, numbered from $1$ to $r$, and you will be given a list describing which of these rooms are already booked. ## Input The input consists of: * one line with two inte...
26,555
Bookshelf Bottleneck Description: Brianna is a bookworm. At home, she has a big bookshelf with all her favourite books. She has a large collection ranging from detective novels and science-fiction novels to biographies. Recently, Brianna has expanded her collection with $n$ graphic novels. However...
26,556
Bookshelf Building Description: Anna just came home from her favourite furniture store Ikey Yeah! where she bought a new bookshelf designed by her favourite artist Bill Lee. The shelf has a rectangular shape with a width of $x$ and a height of $y$. Included in the box of the shelf is one board th...
26,557
Boom! Description: Blowing things up usually requires careful planning, something Luntas is not especially good at. He has randomly thrown a number of bombs on his backyard, which can be seen as a grid of width and height $N$. Now he only has one bomb left, which he intends to use to start the explosio...
26,558
Booming Business Description: You are an expert in bonsai, the Japanese art of cultivating small trees in small containers. Every year, you win the Bonsai Association’s Pruning Competition (BAPC). With all this talent, it would be a shame not to turn your hobby into your job. Recently, you have rented ...
26,559
Bootstrapping Number Description: Neelix has been working on making the Altonian warp bubble power itself up. While waiting for the system checks to complete, he saw a number on his screen and wondered if there is a number that powers itself up to this number. ## Input The first and only input line consi...
26,560
Borders Description: Consider a black and white image, where every pixel has a value of either 0 or 1. Define a region of the image as a collection of pixels that all have the same value, and are interconnected. Specifically, for any two pixels in a region, there is a path between them only going up, d...
26,561
Boredom Buster Description: It goes like this: You have a shuffled deck of $n$ cards, where $n$ is even and each card contains a number from $1$ to $n/2$. There are exactly two cards of each number. The cards are laid face down on the table and your goal is to find what number is written on each of...
26,562
Borg Boogie Description: On the Borg ship there is also a sentry, placed there by the Borg eons ago. This sentry operates according to a rather unsophisticated algorithm, namely walking at random. This gives the sentry one advantage, however: You will never know where it is! More precisely, once every ...
26,563
Borðspil Description: Arnar and Unnar recently bought a new board game. In the game Arnar gets $n$ pieces and Unnar gets $m$ pieces. You can place pieces in three different spots. Arnar starts by distributing all his piece on the spots and then Unnar does the same. For each spot if Unnar has more p...
26,564
Boss Battle Description: You are stuck at a boss level of your favourite video game. The boss battle happens in a circular room with $n$ indestructible pillars arranged evenly around the room. The boss hides behind an unknown pillar. Then the two of you proceed in turns. * First, in your turn, you can thr...
26,565
Bottle Flip Description: After many failed attempts, we noticed that this task gets significantly easier if the bottle is filled with just the right amount of water. The simple reason for this is that the amount of water affects the centre of mass of our bottle as it is about to land.1 A lower centre ...
26,566
Bottle Opening Description: The crown cork bottle stopper, used to seal beer bottles, was the first highly successful disposable product. It was invented by William Painter in 1892 in Baltimore; the product’s disposability and success inspired King C. Gillette to invent the disposable razor when he was...
26,567
Bottled-Up Feelings Description: Peter is expecting a large shipment of fuel oil, but he has a small problem (doesn’t everyone in these programming problems!). The only containers he has are a set of large bottles (each with the same volume) and a set of smaller bottles (also each with the same, but sm...
26,568
Bounding Box Description: The Archeologists of the Current Millenium (ACM) now and then discover ancient artifacts located at vertices of regular polygons. (Recall that an $n$-sided regular polygon is a polygon where all $n$ sides have the same lengths, and the $n$ internal angles where two sides m...
26,569
Bounding Robots Description: As you design your new household helper robot, the SERVE-O-MATIC 1000, you are running it through a number of tests. In one test, you want to make sure that it always knows where it is. In particular, you’re concerned about the situation where the robot runs into a wall tha...
26,570
Bouquet Description: After visiting Keukenhof, one of the world’s largest flower gardens, Lieke became very fond of flowers, so she has decided to collect some tulips growing next to the road in order to build a beautiful bouquet. However, when collecting the flowers, she has to respect some rules due ...
26,571
Bowlstack Description: Baking bread is my favourite spare-time pursuit. I have a number of stainless steel mixing bowls with straight sides, a circular bottom and a wider circular top opening. Geometrically, my bowls are truncated circular cones and for this problem, the thickness of the metal may be ...
26,572
Bowser's Pipes Description: Princess Peach is in trouble again! Of course, Mario is on a quest to rescue her from Bowser. To save her, he has to collect a number of coins located in coin rooms under the surface. To get to a coin room, he must enter pipes on the surface which send him to a room below. ...
26,573
Box and Arrow Diagram Description: In this part of the exam you are given a piece of Python code and you have to draw how the memory structure will look like when the program reaches a given line. Since Itaf is a high-rated competitive programmer her ego always came in the way whenever she tried to stu...
26,574
Box of Mirrors Description: Mathematician Andris likes different puzzles and one of his favorites is a covered box of mirrors. If we look at a horizontal cross-section of such a box, we can see that its bottom part contains $n \times m$ square cells ($n$ rows, and $m$ columns). In each cell there can ...
26,575
Boxed Letters Description: The New York Times publishes a puzzle called “Boxed Letters” for puzzle enthusiasts. In this puzzle, $12$ letters are shown along the $4$ sides of a box. The task is to find words that are spelled when these letters are connected, subject to the following rules: * You may st...
26,576
Boxes Description: There are $N$ boxes, indexed by a number from $1$ to $N$. Each box may (or not may not) be put into other boxes. These boxes together form a tree structure (or a forest structure, to be precise). You have to answer a series of queries of the following form: given a list of indices o...
26,577
Braaaains Description: Aha, you may have found a solution to the zombie apocalypse! All zombies want to do is eat brains, so why not synthesize your own? You have come up with a new recipe for a plant-based brain substitute and have begun mass production. Orders from other strongholds are pouring in. ...
26,578
Bracket Matching Description: Given a bracket sequence $s$ of length $n$, you are to determine if it is valid! A valid bracket sequence is defined recursively as: * “” * $(x)$ where $x$ is a valid bracket sequence * $[x]$ where $x$ is a valid bracket sequence * $\{ x\} $ where ...
26,579
Bracket Matrix Description: A bracket sequence consisting of ‘(’ and ‘)’ is defined to be valid as follows: * An empty sequence is valid. * If $x$ is a valid bracket sequence, then $(x)$ is a valid bracket sequence. * If $x$ and $y$ are valid bracket sequences, then the concatena...
26,580
Bracket Pairing Description: There are four types of brackets: round (), square [], curly {}, and angle <>. A bracket sequence is defined to be valid as follows: * An empty sequence is valid. * If $X$ is a valid bracket sequence, then $pXq$ is a valid bracket sequence, where $p$ is an open ...
26,581
Bracket Sequence Description: Two great friends, Eddie John and Kris Cross, are attending the Brackets Are Perfection Conference. They wholeheartedly agree with the main message of the conference and they are delighted with all the new things they learn about brackets. One of these things is a bracket...
26,582
Brackets Description: * An empty sequence is valid. * If $X$ is a valid bracket sequence, then $(X)$ is a valid bracket sequence. * If $X$ and $Y$ are valid bracket sequences, then the concatenation of $X$ and $Y$, $Z=XY$, is a valid bracket sequence. An empty sequence is val...
26,583
Brahmagupta-Fibonacci Description: You are given non-negative integers $a, b, c, d$. Let $p = a^2 + b^2$ and $q = c^2 + d^2$. You are to use these two formulas to find two ways to write $pq$ as a sum of two squares. ## Input The first and only line of input contains non-negative integers $a, b, c, d \leq ...
26,584
BrainFsckVM Description: Given a brainfsck program, determine whether it terminates or enters an endless loop. A brainfsck interpreter has a data array (consisting of unsigned 8-bit integers) with an index, the so called “data index”; the entry of the array pointed to by the data index is the so calle...
26,585
Brainfuck Description: Brainfuck is an esoteric programming language that operates on a two-way infinite one-dimensional array of $8$-bit memory cells, each initialised to $0$. A pointer points to one of these memory cells. Brainfuck uses the following commands: > Move the pointer one memory cell to t...
26,586
Branch Assignment Description: The Innovative Consumer Products Company (ICPC) is planning to start a top-secret project. This project consists of $s$ subprojects. There will be $b \ge s$ branches of ICPC involved in this project and ICPC wants to assign each branch to one of the subprojects. In ot...
26,587
Branch Manager Description: You are managing a transportation network of one-way roads between cities. People travel through the transportation network one by one in order all starting from the same city, and each person waits for the person before them to stop moving before starting. The people follow...
26,588
Brandvägg Description: On the Internet, there are many bad guys who always try to hack the computers of others. They steal cat pictures, bank logins and membership lists on programming dating sites. One of the first countermeasures against network-based attacks is the firewall. A firewall filters some ...
26,589
Bread First Search Description: All the Mushroom Kingdom’s local $N$ bakeries ran out of bread so Captain Toad went on a quest to buy as much bread as possible. All bakeries form a connected graph with each other, so he decided to apply his favorite algorithm to find the bread: Bread First Search. The ...
26,590
Bread Pit Description: New breeds of underground bacteria help in terraforming Mars. The bacteria feed mainly on regular bread loafs which are baked in huge quantities on the Mars surface and subsequently dropped into a specially constructed pit. To distribute the bread evenly in the subsurface, the pi...
26,591
Bread Sorting Description: Michael works in a bakery. At the end of his shift, his boss wants the breads sorted in a certain order. She can’t seem to decide on which order, though – every day there seems to be a new one – to Michael’s despair. Michael has worked there for a while now and has learned a ...
26,592
Breaking Bad Description: Walter was once a promising chemist. Now he teaches high school students chemistry, and was recently diagnosed with lung cancer. In both desperation and excitement he decides to use his chemistry skills to produce illegal drugs and make quick money for his family. He forms a p...
26,593
Breaking Bars Description: Selma is visited by her two grandchildren Elsa and Asle who love chocolate. To be precise, they are especially fond of the brand Nut Cream Puffed Chocolate that comes in bars made up by $6 \times 6$ squares. The bars can be broken along the valleys between squares into sm...
26,594
Breaking Branches Description: Your parents decided that it would be “fun” to spend the entire Sunday walking near the Mookerheide close to Nijmegen. Although you can pass the time by solving programming problems in your head, your siblings do not have the same luxury. After a short while, your younge...
26,595
Breaking Cake Description: The Hunter Exam has begun! The first round of the Hunter Exam is a real-life problem solving test: Each candidate is given a rectangular parallelepiped cake of size $a \times b \times c$, which can be divided into unit cubes of size $1 \times 1 \times 1$. Inside the cak...
26,596
Brexit Description: A long time ago in a galaxy far, far away, there was a large interstellar trading union, consisting of many countries from all across the galaxy. Recently, one of the countries decided to leave the union. As a result, other countries are thinking about leaving too, as their particip...
26,597
Brexit Negotiations Description: As we all know, Brexit negotiations are on their way—but we still do not know whether they will actually finish in time. The negotiations will take place topic-by-topic. To organise the negotiations in the most effective way, the topics will all be discussed and finali...
26,598
Bribe Description: After having done a lot of spying and infiltrating a criminal network, you are now ready to try and dismantle it. This, however, requires the cooperation of a certain number of the henchmen. This in turn requires money in order to bribe them, but due to budget cuts, you only have a l...
26,599