question large_stringlengths 265 13.2k |
|---|
Solve the programming task below in a Python markdown code block.
We have N colored balls arranged in a row from left to right; the color of the i-th ball from the left is c_i.
You are given Q queries. The i-th query is as follows: how many different colors do the l_i-th through r_i-th balls from the left have?
-----... |
Solve the programming task below in a Python markdown code block.
Vasya is preparing a contest, and now he has written a statement for an easy problem. The statement is a string of length $n$ consisting of lowercase Latin latters. Vasya thinks that the statement can be considered hard if it contains a subsequence hard... |
Solve the programming task below in a Python markdown code block.
Everyone knows passphrases. One can choose passphrases from poems, songs, movies names and so on but frequently
they can be guessed due to common cultural references.
You can get your passphrases stronger by different means. One is the following:
choo... |
Solve the programming task below in a Python markdown code block.
Lesha plays the recently published new version of the legendary game hacknet. In this version character skill mechanism was introduced. Now, each player character has exactly n skills. Each skill is represented by a non-negative integer ai — the current... |
Solve the programming task below in a Python markdown code block.
The "Bulls and Cows" game needs two people to play. The thinker thinks of a number and the guesser tries to guess it.
The thinker thinks of a four-digit number in the decimal system. All the digits in the number are different and the number may have a ... |
Solve the programming task below in a Python markdown code block.
We say that a odd number N is similar to 2017 when both N and (N+1)/2 are prime.
You are given Q queries.
In the i-th query, given two odd numbers l_i and r_i, find the number of odd numbers x similar to 2017 such that l_i ≤ x ≤ r_i.
-----Constraints--... |
Solve the programming task below in a Python markdown code block.
Takahashi likes the sound when he buys a drink from a vending machine.
That sound can be heard by spending A yen (the currency of Japan) each time.
Takahashi has B yen. He will hear the sound as many times as he can with that money, but at most C times,... |
Solve the programming task below in a Python markdown code block.
Xenia the beginner mathematician is a third year student at elementary school. She is now learning the addition operation.
The teacher has written down the sum of multiple numbers. Pupils should calculate the sum. To make the calculation easier, the su... |
Solve the programming task below in a Python markdown code block.
The development of algae in a pond is as follows.
Let the total weight of the algae at the beginning of the year i be x_i gram. For i≥2000, the following formula holds:
- x_{i+1} = rx_i - D
You are given r, D and x_{2000}. Calculate x_{2001}, ..., x_{2... |
Solve the programming task below in a Python markdown code block.
Smeke has decided to participate in AtCoder Beginner Contest (ABC) if his current rating is less than 1200, and participate in AtCoder Regular Contest (ARC) otherwise.
You are given Smeke's current rating, x. Print ABC if Smeke will participate in ABC, ... |
Solve the programming task below in a Python markdown code block.
A checksum is an algorithm that scans a packet of data and returns a single number. The idea is that if the packet is changed, the checksum will also change, so checksums are often used for detecting
transmission errors, validating document contents, an... |
Solve the programming task below in a Python markdown code block.
The GCD table G of size n × n for an array of positive integers a of length n is defined by formula
<image>
Let us remind you that the greatest common divisor (GCD) of two positive integers x and y is the greatest integer that is divisor of both x an... |
Solve the programming task below in a Python markdown code block.
A new school year is approaching, which also means students will be taking tests.
The tests in this kata are to be graded in different ways. A certain number of points will be given for each correct answer and a certain number of points will be deduct... |
Solve the programming task below in a Python markdown code block.
There is a rectangular grid of size $n \times m$. Each cell has a number written on it; the number on the cell ($i, j$) is $a_{i, j}$. Your task is to calculate the number of paths from the upper-left cell ($1, 1$) to the bottom-right cell ($n, m$) meet... |
Solve the programming task below in a Python markdown code block.
A subsequence of a string S is a string that can be obtained by deleting zero or more characters from S without changing the order of the remaining characters.
For example, arc, artistic and (an empty string) are all subsequences of artistic; abc and ci... |
Solve the programming task below in a Python markdown code block.
«One dragon. Two dragon. Three dragon», — the princess was counting. She had trouble falling asleep, and she got bored of counting lambs when she was nine.
However, just counting dragons was boring as well, so she entertained herself at best she could.... |
Solve the programming task below in a Python markdown code block.
The `depth` of an integer `n` is defined to be how many multiples of `n` it is necessary to compute before all `10` digits have appeared at least once in some multiple.
example:
```
let see n=42
Multiple value digits comment
42*1 ... |
Solve the programming task below in a Python markdown code block.
Mr Keks is a typical white-collar in Byteland.
He has a bookshelf in his office with some books on it, each book has an integer positive price.
Mr Keks defines the value of a shelf as the sum of books prices on it.
Miraculously, Mr Keks was promoted... |
Solve the programming task below in a Python markdown code block.
In one school with Vasya there is a student Kostya. Kostya does not like physics, he likes different online games. Every day, having come home, Kostya throws his bag in the farthest corner and sits down at his beloved computer. Kostya even eats glued to... |
Solve the programming task below in a Python markdown code block.
Prime numbers are widely applied for cryptographic and communication technology. A twin prime is a prime number that differs from another prime number by 2. For example, (5, 7) and (11, 13) are twin prime pairs.
In this problem, we call the greater num... |
Solve the programming task below in a Python markdown code block.
DO YOU EXPECT ME TO FIND THIS OUT?
WHAT BASE AND/XOR LANGUAGE INCLUDES string?
DON'T BYTE OF MORE THAN YOU CAN CHEW
YOU CAN ONLY DISTORT THE LARGEST OF MATHEMATICS SO FAR
SAYING "ABRACADABRA" WITHOUT A MAGIC AND WON'T DO YOU ANY GOOD
THE LAST STACK... |
Solve the programming task below in a Python markdown code block.
In this Kata, you will implement the [Luhn Algorithm](http://en.wikipedia.org/wiki/Luhn_algorithm), which is used to help validate credit card numbers.
Given a positive integer of up to 16 digits, return ```true``` if it is a valid credit card number, ... |
Solve the programming task below in a Python markdown code block.
Smith wakes up at the side of a dirty, disused bathroom, his ankle chained to pipes. Next to him is tape-player with a hand-written message "Play Me". He finds a tape in his own back pocket. After putting the tape in the tape-player, he sees a key hangi... |
Solve the programming task below in a Python markdown code block.
We define the "unfairness" of a list/array as the *minimal* difference between max(x1,x2,...xk) and min(x1,x2,...xk), for all possible combinations of k elements you can take from the list/array; both minimum and maximum of an empty list/array are consi... |
Solve the programming task below in a Python markdown code block.
Fox Ciel is playing a card game with her friend Fox Jiro. There are n piles of cards on the table. And there is a positive integer on each card.
The players take turns and Ciel takes the first turn. In Ciel's turn she takes a card from the top of any n... |
Solve the programming task below in a Python markdown code block.
You are given two arrays $a$ and $b$ both consisting of $n$ positive (greater than zero) integers. You are also given an integer $k$.
In one move, you can choose two indices $i$ and $j$ ($1 \le i, j \le n$) and swap $a_i$ and $b_j$ (i.e. $a_i$ becomes ... |
Solve the programming task below in a Python markdown code block.
Make a program that filters a list of strings and returns a list with only your friends name in it.
If a name has exactly 4 letters in it, you can be sure that it has to be a friend of yours! Otherwise, you can be sure he's not...
Ex: Input = ["Ryan",... |
Solve the programming task below in a Python markdown code block.
Leha like all kinds of strange things. Recently he liked the function F(n, k). Consider all possible k-element subsets of the set [1, 2, ..., n]. For subset find minimal element in it. F(n, k) — mathematical expectation of the minimal element among all ... |
Solve the programming task below in a Python markdown code block.
This is the hard version of the problem. The only difference is that in this version $n \leq 200000$. You can make hacks only if both versions of the problem are solved.
There are $n$ potions in a line, with potion $1$ on the far left and potion $n$ on... |
Solve the programming task below in a Python markdown code block.
Write a program which computes the digit number of sum of two integers a and b.
Constraints
* 0 ≤ a, b ≤ 1,000,000
* The number of datasets ≤ 200
Input
There are several test cases. Each test case consists of two non-negative integers a and b which ... |
Solve the programming task below in a Python markdown code block.
Takahashi has decided to distribute N AtCoder Crackers to K users of as evenly as possible.
When all the crackers are distributed, find the minimum possible (absolute) difference between the largest number of crackers received by a user and the smallest... |
Solve the programming task below in a Python markdown code block.
You are given an integer K. Print the string obtained by repeating the string `ACL` K times and concatenating them.
For example, if K = 3, print `ACLACLACL`.
Constraints
* 1 \leq K \leq 5
* All values in input are integers.
Input
Input is given fro... |
Solve the programming task below in a Python markdown code block.
Hilbert's Hotel is a very unusual hotel since the number of rooms is infinite! In fact, there is exactly one room for every integer, including zero and negative integers. Even stranger, the hotel is currently at full capacity, meaning there is exactly o... |
Solve the programming task below in a Python markdown code block.
A tatami mat, a Japanese traditional floor cover, has a rectangular form with aspect ratio 1:2. When spreading tatami mats on a floor, it is prohibited to make a cross with the border of the tatami mats, because it is believed to bring bad luck.
Your t... |
Solve the programming task below in a Python markdown code block.
We have N boxes, numbered 1 through N. At first, box 1 contains one red ball, and each of the other boxes contains one white ball.
Snuke will perform the following M operations, one by one. In the i-th operation, he randomly picks one ball from box x_i... |
Solve the programming task below in a Python markdown code block.
Brave Ponta and his best friend, Brave Gonta, have come to Luida's bar in search of friends to embark on an epic adventure. There are many warriors, monks and wizards in the tavern who are itching to go on an adventure.
Gonta, who is kind-hearted, care... |
Solve the programming task below in a Python markdown code block.
As meticulous Gerald sets the table, Alexander finished another post on Codeforces and begins to respond to New Year greetings from friends. Alexander has n friends, and each of them sends to Alexander exactly one e-card. Let us number his friends by nu... |
Solve the programming task below in a Python markdown code block.
You have A 500-yen coins, B 100-yen coins and C 50-yen coins (yen is the currency of Japan).
In how many ways can we select some of these coins so that they are X yen in total?
Coins of the same kind cannot be distinguished. Two ways to select coins are... |
Solve the programming task below in a Python markdown code block.
A Little Elephant from the Zoo of Lviv likes lucky strings, i.e., the strings that consist only of the lucky digits 4 and 7.
The Little Elephant calls some string T of the length M balanced if there exists at least one integer X (1 ≤ X ≤ M) such that t... |
Solve the programming task below in a Python markdown code block.
There are $n$ cities numbered from $1$ to $n$, and city $i$ has beauty $a_i$.
A salesman wants to start at city $1$, visit every city exactly once, and return to city $1$.
For all $i\ne j$, a flight from city $i$ to city $j$ costs $\max(c_i,a_j-a_i)$ ... |
Solve the programming task below in a Python markdown code block.
Example
Input
5 3
4
2
5
Output
5
2
4
1
3
Read the inputs from stdin solve the problem and write the answer to stdout (do not directly test on the sample inputs). Enclose your code within ```python delimiters. |
Solve the programming task below in a Python markdown code block.
There are n psychos standing in a line. Each psycho is assigned a unique integer from 1 to n. At each step every psycho who has an id greater than the psycho to his right (if exists) kills his right neighbor in the line. Note that a psycho might kill an... |
Solve the programming task below in a Python markdown code block.
You are given a tree consisting exactly of $n$ vertices. Tree is a connected undirected graph with $n-1$ edges. Each vertex $v$ of this tree has a value $a_v$ assigned to it.
Let $dist(x, y)$ be the distance between the vertices $x$ and $y$. The distan... |
Solve the programming task below in a Python markdown code block.
Dima worked all day and wrote down on a long paper strip his favorite number $n$ consisting of $l$ digits. Unfortunately, the strip turned out to be so long that it didn't fit in the Dima's bookshelf.
To solve the issue, Dima decided to split the strip... |
Solve the programming task below in a Python markdown code block.
You have n distinct points on a plane, none of them lie on OY axis. Check that there is a point after removal of which the remaining points are located on one side of the OY axis.
-----Input-----
The first line contains a single positive integer n (2... |
Solve the programming task below in a Python markdown code block.
Catherine received an array of integers as a gift for March 8. Eventually she grew bored with it, and she started calculated various useless characteristics for it. She succeeded to do it for each one she came up with. But when she came up with another ... |
Solve the programming task below in a Python markdown code block.
We'll call an array of n non-negative integers a[1], a[2], ..., a[n] interesting, if it meets m constraints. The i-th of the m constraints consists of three integers li, ri, qi (1 ≤ li ≤ ri ≤ n) meaning that value <image> should be equal to qi.
Your t... |
Solve the programming task below in a Python markdown code block.
Read problems statements in Mandarin Chinese and Russian.
A new school in Byteland is now in the process of renewing some classrooms with new, stronger and better chairs, so that the students can stay still and pay attention to class :)
However, du... |
Solve the programming task below in a Python markdown code block.
Write a function `getDrinkByProfession`/`get_drink_by_profession()` that receives as input parameter a string, and produces outputs according to the following table:
Input
Output
"Jabroni"
"Patron Tequila"
"School Counselor"
"Anything with Alcoh... |
Solve the programming task below in a Python markdown code block.
A superhero fights with a monster. The battle consists of rounds, each of which lasts exactly $n$ minutes. After a round ends, the next round starts immediately. This is repeated over and over again.
Each round has the same scenario. It is described by... |
Solve the programming task below in a Python markdown code block.
Ikta, who hates to lose, has recently been enthusiastic about playing games using the Go board. However, neither Go nor Gomoku can beat my friends at all, so I decided to give a special training to the lesser-known game Phutball.
This game is a difficu... |
Solve the programming task below in a Python markdown code block.
Math hasn't always been your best subject, and these programming symbols always trip you up!
I mean, does `**` mean *"Times, Times"* or *"To the power of"*?
Luckily, you can create the function `expression_out()` to write out the expressions for you!
... |
Solve the programming task below in a Python markdown code block.
We have a string of letters 'a' and 'b'. We want to perform some operations on it. On each step we choose one of substrings "ab" in the string and replace it with the string "bba". If we have no "ab" as a substring, our job is done. Print the minimum nu... |
Solve the programming task below in a Python markdown code block.
There is a $n \times m$ grid. You are standing at cell $(1, 1)$ and your goal is to finish at cell $(n, m)$.
You can move to the neighboring cells to the right or down. In other words, suppose you are standing at cell $(x, y)$. You can:
move right to ... |
Solve the programming task below in a Python markdown code block.
A frog lives on the axis Ox and needs to reach home which is in the point n. She starts from the point 1. The frog can jump to the right at a distance not more than d. So, after she jumped from the point x she can reach the point x + a, where a is an in... |
Solve the programming task below in a Python markdown code block.
Sum all the numbers of the array (in F# and Haskell you get a list) except the highest and the lowest element (the value, not the index!).
(The highest/lowest element is respectively only one element at each edge, even if there are more than one with th... |
Solve the programming task below in a Python markdown code block.
Bees Alice and Alesya gave beekeeper Polina famous card game "Set" as a Christmas present. The deck consists of cards that vary in four features across three options for each kind of feature: number of shapes, shape, shading, and color. In this game, so... |
Solve the programming task below in a Python markdown code block.
There are N people standing on the x-axis. Let the coordinate of Person i be x_i. For every i, x_i is an integer between 0 and 10^9 (inclusive). It is possible that more than one person is standing at the same coordinate.
You will given M pieces of inf... |
Solve the programming task below in a Python markdown code block.
*** No Loops Allowed ***
You will be given an array (a) and a value (x). All you need to do is check whether the provided array contains the value, without using a loop.
Array can contain numbers or strings. X can be either. Return true if the array c... |
Solve the programming task below in a Python markdown code block.
You've got a list of program warning logs. Each record of a log stream is a string in this format: "2012-MM-DD HH:MM:SS:MESSAGE" (without the quotes).
String "MESSAGE" consists of spaces, uppercase and lowercase English letters and characters "!", ".... |
Solve the programming task below in a Python markdown code block.
Calculate the trace of a square matrix. A square matrix has `n` rows and `n` columns, where `n` is any integer > 0. The entries of the matrix can contain any number of integers. The function should return the calculated trace of the matrix, or `nil/None... |
Solve the programming task below in a Python markdown code block.
There are N towns in JOI, which are connected by M bidirectional roads. There are shopping malls in K towns, and the people go to one of those towns through the road to shop.
Depending on the location of your home, you may have to travel long distances... |
Solve the programming task below in a Python markdown code block.
If the strings are consecutive, you can replace the characters with a rule to shorten the string. For example, for the string AAAA, the expression @ 4A will compress one character. Create a program that restores the character string compressed by this r... |
Solve the programming task below in a Python markdown code block.
Facetook is a well known social network website, and it will launch a new feature called Facetook Priority Wall. This feature will sort all posts from your friends according to the priority factor (it will be described).
This priority factor will be af... |
Solve the programming task below in a Python markdown code block.
Mike has a frog and a flower. His frog is named Xaniar and his flower is named Abol. Initially(at time 0), height of Xaniar is h_1 and height of Abol is h_2. Each second, Mike waters Abol and Xaniar.
[Image]
So, if height of Xaniar is h_1 and height... |
Solve the programming task below in a Python markdown code block.
You are given two non-negative integers L and R.
We will choose two integers i and j such that L \leq i < j \leq R.
Find the minimum possible value of (i \times j) \mbox{ mod } 2019.
-----Constraints-----
- All values in input are integers.
- 0 \leq ... |
Solve the programming task below in a Python markdown code block.
Advanced Creative Mobile (ACM) has decided to develop a GUI application to be installed in a new portable computer.
As shown in the figure below, the GUI has a nested structure in which it has one main panel, several panels are arranged on it, and some... |
Solve the programming task below in a Python markdown code block.
A total of n depots are located on a number line. Depot i lies at the point x_i for 1 ≤ i ≤ n.
You are a salesman with n bags of goods, attempting to deliver one bag to each of the n depots. You and the n bags are initially at the origin 0. You can car... |
Solve the programming task below in a Python markdown code block.
Snuke has an empty sequence a.
He will perform N operations on this sequence.
In the i-th operation, he chooses an integer j satisfying 1 \leq j \leq i, and insert j at position j in a (the beginning is position 1).
You are given a sequence b of leng... |
Solve the programming task below in a Python markdown code block.
Heidi found out that the Daleks have created a network of bidirectional Time Corridors connecting different destinations (at different times!). She suspects that they are planning another invasion on the entire Space and Time. In order to counter the in... |
Solve the programming task below in a Python markdown code block.
Once upon a time in the thicket of the mushroom forest lived mushroom gnomes. They were famous among their neighbors for their magic mushrooms. Their magic nature made it possible that between every two neighboring mushrooms every minute grew another mu... |
Solve the programming task below in a Python markdown code block.
In this Kata, you will be given two numbers, `a` and `b`, and your task is to determine if the first number `a` is divisible by `all` the prime factors of the second number `b`. For example: `solve(15,12) = False` because `15` is not divisible by all th... |
Solve the programming task below in a Python markdown code block.
A team of three programmers is going to play a contest. The contest consists of $n$ problems, numbered from $1$ to $n$. Each problem is printed on a separate sheet of paper. The participants have decided to divide the problem statements into three parts... |
Solve the programming task below in a Python markdown code block.
Mahmoud has n line segments, the i-th of them has length a_{i}. Ehab challenged him to use exactly 3 line segments to form a non-degenerate triangle. Mahmoud doesn't accept challenges unless he is sure he can win, so he asked you to tell him if he shoul... |
Solve the programming task below in a Python markdown code block.
You are going out for a walk, when you suddenly encounter a monster. Fortunately, you have N katana (swords), Katana 1, Katana 2, …, Katana N, and can perform the following two kinds of attacks in any order:
- Wield one of the katana you have. When you... |
Solve the programming task below in a Python markdown code block.
The king Copa often has been reported about the Codeforces site, which is rapidly getting more and more popular among the brightest minds of the humanity, who are using it for training and competing. Recently Copa understood that to conquer the world he... |
Solve the programming task below in a Python markdown code block.
Alice got tired of playing the tag game by the usual rules so she offered Bob a little modification to it. Now the game should be played on an undirected rooted tree of n vertices. Vertex 1 is the root of the tree.
Alice starts at vertex 1 and Bob star... |
Solve the programming task below in a Python markdown code block.
problem
You are looking for a constellation in a picture of the starry sky. The photo always contains exactly one figure with the same shape, orientation, and size as the constellation you are looking for. However, there is a possibility that extra sta... |
Solve the programming task below in a Python markdown code block.
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 from the first.
On the $i$-th day Polycarp will necessarily solve $a_i$ problems. One eveni... |
Solve the programming task below in a Python markdown code block.
A flow network is a directed graph which has a $source$ and a $sink$. In a flow network, each edge $(u, v)$ has a capacity $c(u, v)$. Each edge receives a flow, but the amount of flow on the edge can not exceed the corresponding capacity. Find the maxim... |
Solve the programming task below in a Python markdown code block.
Emuskald is a well-known illusionist. One of his trademark tricks involves a set of magical boxes. The essence of the trick is in packing the boxes inside other boxes.
From the top view each magical box looks like a square with side length equal to 2^{... |
Solve the programming task below in a Python markdown code block.
Vasya decided to write an anonymous letter cutting the letters out of a newspaper heading. He knows heading s1 and text s2 that he wants to send. Vasya can use every single heading letter no more than once. Vasya doesn't have to cut the spaces out of th... |
Solve the programming task below in a Python markdown code block.
A programming contest will be held at White Tiger University this year as well. There are several questions in the contest, each of which is assigned a score according to the difficulty level.
The executive committee decided to calculate the score for ... |
Solve the programming task below in a Python markdown code block.
Find the sum of the weights of edges of the Minimum-Cost Arborescence with the root r for a given weighted directed graph G = (V, E).
Constraints
* 1 ≤ |V| ≤ 100
* 0 ≤ |E| ≤ 1,000
* 0 ≤ wi ≤ 10,000
* G has arborescence(s) with the root r
Input
|V| ... |
Solve the programming task below in a Python markdown code block.
Create a function that takes in the sum and age difference of two people, calculates their individual ages, and returns a pair of values (oldest age first) if those exist or `null/None` if:
* `sum < 0`
* `difference < 0`
* Either of the calculated ages... |
Solve the programming task below in a Python markdown code block.
You've got an array a, consisting of n integers. The array elements are indexed from 1 to n. Let's determine a two step operation like that:
1. First we build by the array a an array s of partial sums, consisting of n elements. Element number i (1 ≤ ... |
Solve the programming task below in a Python markdown code block.
You need to play around with the provided string (s).
Move consonants forward 9 places through the alphabet.
If they pass 'z', start again at 'a'.
Move vowels back 5 places through the alphabet.
If they pass 'a', start again at 'z'.
For our Polish fri... |
Solve the programming task below in a Python markdown code block.
Find the difference of two sets $A = \\{a_0, a_1, ..., a_{n-1}\\}$ and $B = \\{b_0, b_1, ..., b_{m-1}\\}$, $A - B$.
Constraints
* $1 \leq n, m \leq 200,000$
* $0 \leq a_0 < a_1 < ... < a_{n-1} \leq 10^9$
* $0 \leq b_0 < b_1 < ... < b_{m-1} \leq 10^9$
... |
Solve the programming task below in a Python markdown code block.
Welcome! Everything is fine.
You have arrived in The Medium Place, the place between The Good Place and The Bad Place. You are assigned a task that will either make people happier or torture them for eternity.
You have a list of $k$ pairs of people wh... |
Solve the programming task below in a Python markdown code block.
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 red. They have $y$ yellow ornaments, $b$ blue ornaments and $r$ red ornaments.
In Bob's opinion, a Christmas Tre... |
Solve the programming task below in a Python markdown code block.
New Year is coming and you are excited to know how many minutes remain before the New Year. You know that currently the clock shows $h$ hours and $m$ minutes, where $0 \le hh < 24$ and $0 \le mm < 60$. We use 24-hour time format!
Your task is to find t... |
Solve the programming task below in a Python markdown code block.
You are given a rooted tree. Each vertex contains a_i tons of gold, which costs c_i per one ton. Initially, the tree consists only a root numbered 0 with a_0 tons of gold and price c_0 per ton.
There are q queries. Each query has one of two types:
... |
Solve the programming task below in a Python markdown code block.
Bajtek, known for his unusual gifts, recently got an integer array $x_0, x_1, \ldots, x_{k-1}$.
Unfortunately, after a huge array-party with his extraordinary friends, he realized that he'd lost it. After hours spent on searching for a new toy, Bajtek ... |
Solve the programming task below in a Python markdown code block.
You are given an integer array $a$ of length $n$.
Does there exist an array $b$ consisting of $n+1$ positive integers such that $a_i=\gcd (b_i,b_{i+1})$ for all $i$ ($1 \leq i \leq n$)?
Note that $\gcd(x, y)$ denotes the greatest common divisor (GCD) ... |
Solve the programming task below in a Python markdown code block.
You are given two integers $n$ and $k$.
Your task is to construct such a string $s$ of length $n$ that for each $i$ from $1$ to $k$ there is at least one $i$-th letter of the Latin alphabet in this string (the first letter is 'a', the second is 'b' and... |
Solve the programming task below in a Python markdown code block.
Consider the sequence `a(1) = 7, a(n) = a(n-1) + gcd(n, a(n-1)) for n >= 2`:
`7, 8, 9, 10, 15, 18, 19, 20, 21, 22, 33, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 69, 72, 73...`.
Let us take the differences between successive elements of the sequence... |
Solve the programming task below in a Python markdown code block.
This is a simplified version of the task Toy Train. These two versions differ only in the constraints. Hacks for this version are disabled.
Alice received a set of Toy Train™ from Bob. It consists of one train and a connected railway network of n stati... |
Solve the programming task below in a Python markdown code block.
### Longest Palindrome
Find the length of the longest substring in the given string `s` that is the same in reverse.
As an example, if the input was “I like racecars that go fast”, the substring (`racecar`) length would be `7`.
If the length... |
Solve the programming task below in a Python markdown code block.
You have a string of decimal digits s. Let's define bij = si·sj. Find in matrix b the number of such rectangles that the sum bij for all cells (i, j) that are the elements of the rectangle equals a in each rectangle.
A rectangle in a matrix is a group ... |
Solve the programming task below in a Python markdown code block.
Let us denote by f(x, m) the remainder of the Euclidean division of x by m.
Let A be the sequence that is defined by the initial value A_1=X and the recurrence relation A_{n+1} = f(A_n^2, M).
Find \displaystyle{\sum_{i=1}^N A_i}.
-----Constraints-----
... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.