New Year and Hurry
Limak is going to participate in a contest on the last day of the 2016. The contest will start at 20:00 and will last four […]
New Year
New Year and Rating
Every Codeforces user has rating, described with one integer, possibly negative or zero. Users are divided into two divisions. The first division is for users […]
New Year and North Pole
In this problem we assume the Earth to be a completely round ball and its surface a perfect sphere. The length of the equator and […]
New Year and Fireworks
One tradition of welcoming the New Year is launching fireworks into the sky. Usually a launched firework flies vertically upward for some period of time, […]
New Year and Binary Tree Paths
The New Year tree is an infinite perfect binary tree rooted in the node 1. Each node v has two children: nodes indexed (2·v) and (2·v + 1). Polar bears love decorating the […]
New Year and Finding Roots
This is an interactive problem. In the interaction section below you will find the information about flushing the output. The New Year tree of height h is […]
New Year and the Christmas Ornament
Alice and Bob are decorating a Christmas Tree. Alice wants only $3$ types of ornaments to be used on the Christmas Tree: yellow, blue and […]
New Year and the Treasure Geolocation
Bob is a pirate looking for the greatest treasure the world has ever seen. The treasure is located at the point $T$, which coordinates to […]
New Year and the Sphere Transmission
There are $n$ people sitting in a circle, numbered from $1$ to $n$ in the order in which they are seated. That is, for all […]
New Year and the Permutation Concatenation
Let $n$ be an integer. Consider all permutations on integers $1$ to $n$ in lexicographic order, and concatenate them into one big sequence $p$. For […]
New Year and the Acquaintance Estimation
Bob is an active user of the social network Faithbug. On this network, people are able to engage in a mutual friendship. That is, if […]
New Year and the Mallard Expedition
Bob is a duck. He wants to get to Alice’s nest, so that those two can duck! Duck is the ultimate animal! (Image courtesy of […]
New Year and the Factorisation Collaboration
Integer factorisation is hard. The RSA Factoring Challenge offered $$100\,000$ for factoring RSA-$1024$, a $1024$-bit long product of two prime numbers. To this date, nobody […]
New Year and the Tricolore Recreation
Alice and Bob play a game on a grid with $n$ rows and infinitely many columns. In each row, there are three tokens, blue, white […]
New Year and Ascent Sequence
A sequence $a = [a_1, a_2, \ldots, a_l]$ of length $l$ has an ascent if there exists a pair of indices $(i, j)$ such that $1 \le […]
New Year and Permutation
Recall that the permutation is an array consisting of $n$ distinct integers from $1$ to $n$ in arbitrary order. For example, $[2,3,1,5,4]$ is a permutation, […]
New Year and Naming
Happy new year! The year 2020 is also known as Year Gyeongja (경자년, gyeongja-nyeon) in Korea. Where did the name come from? Let’s briefly look at the Gapja system, which […]
New Year and Conference
Filled with optimism, Hyunuk will host a conference about how great this new year will be! The conference will have $n$ lectures. Hyunuk has two […]
New Year and Castle Construction
Kiwon’s favorite video game is now holding a new year event to motivate the users! The game is about building and defending a castle, which […]
New Year and Social Network
Donghyun’s new social network service (SNS) contains $n$ users numbered $1, 2, \ldots, n$. Internally, their network is a tree graph, so there are $n-1$ direct […]
