PolandBall and Hypothesis
PolandBall is a young, clever Ball. He is interested in prime numbers. He has stated a following hypothesis: “There exists such a positive integer n that for […]
ACM
PolandBall and Game
PolandBall is playing a game with EnemyBall. The rules are simple. Players have to say words in turns. You cannot say a word which was […]
PolandBall and Polygon
PolandBall has such a convex polygon with n veritces that no three of its diagonals intersect at the same point. PolandBall decided to improve it and draw […]
PolandBall and Forest
PolandBall lives in a forest with his family. There are some trees in the forest. Trees are undirected acyclic graphs with k vertices and k - 1 edges, where k is some integer. […]
PolandBall and Gifts
It’s Christmas time! PolandBall and his friends will be giving themselves gifts. There are n Balls overall. Each Ball has someone for whom he should bring a […]
PolandBall and White-Red graph
PolandBall has an undirected simple graph consisting of n vertices. Unfortunately, it has no edges. The graph is very sad because of that. PolandBall wanted to make […]
PolandBall and Many Other Balls
PolandBall is standing in a row with Many Other Balls. More precisely, there are exactly n Balls. Balls are proud of their home land — and they want […]
Travel Card
A new innovative ticketing systems for public transport is introduced in Bytesburg. Now there is a single travel card for all transport. To make a […]
Pavel and barbecue
Pavel cooks barbecue. There are n skewers, they lay on a brazier in a row, each on one of n positions. Pavel wants each skewer to be cooked some […]
Nikita and stack
Nikita has a stack. A stack in this problem is a data structure that supports two operations. Operation push(x) puts an integer x on the top of the stack, […]
Bacterial Melee
Julia is conducting an experiment in her lab. She placed several luminescent bacterial colonies in a horizontal testtube. Different types of bacteria can be distinguished […]
A Serial Killer
Our beloved detective, Sherlock is currently trying to catch a serial killer who kills a person each day. Using his powers of deduction, he came […]
Sherlock and his girlfriend
Sherlock has a new girlfriend (so unlike him!). Valentine’s day is coming and he wants to gift her some jewelry. He bought n pieces of jewelry. The i-th […]
The Holmes Children
The Holmes children are fighting over who amongst them is the cleverest. Mycroft asked Sherlock and Eurus to find value of f(n), where f(1) = 1 and for n ≥ 2, f(n) is the number […]
Molly’s Chemicals
Molly Hooper has n different kinds of chemicals arranged in a line. Each of the chemicals has an affection value, The i-th of them has affection value a i. Molly […]
The Door Problem
Moriarty has trapped n people in n distinct rooms in a hotel. Some rooms are locked, others are unlocked. But, there is a condition that the people in the […]
Sherlock and the Encrypted Data
Sherlock found a piece of encrypted data which he thinks will be useful to catch Moriarty. The encrypted data consists of two integer l and r. He noticed […]
Sherlock’s bet to Moriarty
Sherlock met Moriarty for a final battle of wits. He gave him a regular n sided convex polygon. In addition to it, he gave him certain diagonals […]
Carrot Cakes
In some game by Playrix it takes t minutes for an oven to bake k carrot cakes, all cakes are ready at the same moment t minutes after they started baking. […]
