question large_stringlengths 265 13.2k |
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You are given three multisets of pairs of colored sticks: $R$ pairs of red sticks, the first pair has length $r_1$, the second pair has length $r_2$, $\dots$, the $R$-th pair has length $r_R$; $G$ pairs of green sticks, the first pair has length $g_1... |
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To celebrate the opening of the Winter Computer School the organizers decided to buy in n liters of cola. However, an unexpected difficulty occurred in the shop: it turned out that cola is sold in bottles 0.5, 1 and 2 liters in volume. At that, there ar... |
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There are N points in a two-dimensional plane. The initial coordinates of the i-th point are (x_i, y_i). Now, each point starts moving at a speed of 1 per second, in a direction parallel to the x- or y- axis. You are given a character d_i that represent... |
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You are given a sequence of positive integers of length N, a = (a_1, a_2, ..., a_N).
Your objective is to remove some of the elements in a so that a will be a good sequence.
Here, an sequence b is a good sequence when the following condition holds true:... |
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Hey CodeWarrior,
we've got a lot to code today!
I hope you know the basic string manipulation methods, because this kata will be all about them.
Here we go...
## Background
We've got a very long string, containing a bunch of User IDs. This string i... |
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# One is the loneliest number
## Task
The range of vision of a digit is its own value. `1` can see one digit to the left and one digit to the right,` 2` can see two digits, and so on.
Thus, the loneliness of a digit `N` is the sum of the digits which... |
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Extended Euclid Algorithm
Given positive integers a and b, find the integer solution (x, y) to ax + by = gcd(a, b), where gcd(a, b) is the greatest common divisor of a and b.
Constraints
* 1 ≤ a, b ≤ 109
Input
a b
Two positive integers a and ... |
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Lucifer and Crowley being two most dangerous demons are fighting to become king of hell. A question is given to them. The one who solves it first becomes King. Given an array A of N elements and an integer M. Print YES if you find three distinct indexes... |
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Ziota found a video game called "Monster Invaders".
Similar to every other shooting RPG game, "Monster Invaders" involves killing monsters and bosses with guns.
For the sake of simplicity, we only consider two different types of monsters and three dif... |
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Computer graphics uses polygon models as a way to represent three-dimensional shapes. A polygon model is a model that creates a surface by giving the coordinates of vertices and how to connect those vertices.
A general polygon model can handle any poly... |
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F: Miko Mi String-
story
Mikko Mikkomi ~! Everyone's idol, Miko Miko Tazawa! Today ~, with Mikoto ~, practice the string algorithm, let's do it ☆
Miko's special ~~ character making ~~ The slogan "MikoMikomi" becomes "MikoMikoMi" in Roman letters! In ... |
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Limak is a little polar bear. He likes nice strings — strings of length n, consisting of lowercase English letters only.
The distance between two letters is defined as the difference between their positions in the alphabet. For example, $\operatorname{... |
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[Image]
-----Input-----
The first line of the input is a string (between 1 and 50 characters long, inclusive). Each character will be a letter of English alphabet, lowercase or uppercase.
The second line of the input is an integer between 0 and 26,... |
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### Introduction and Warm-up (Highly recommended)
### [Playing With Lists/Arrays Series](https://www.codewars.com/collections/playing-with-lists-slash-arrays)
___
## Task
**_Given_** an *array/list [] of integers* , **_Find the product of the k maxim... |
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On his free time, Chouti likes doing some housework. He has got one new task, paint some bricks in the yard.
There are $n$ bricks lined in a row on the ground. Chouti has got $m$ paint buckets of different colors at hand, so he painted each brick in on... |
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There are $n$ pillars aligned in a row and numbered from $1$ to $n$.
Initially each pillar contains exactly one disk. The $i$-th pillar contains a disk having radius $a_i$.
You can move these disks from one pillar to another. You can take a disk from ... |
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Let's call a set of positive integers a_1, a_2, ..., a_k quadratic if the product of the factorials of its elements is a square of an integer, i. e. ∏_{i=1}^{k} a_i! = m^2, for some integer m.
You are given a positive integer n.
Your task is to find a... |
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# Task
In ChessLand there is a small but proud chess bishop with a recurring dream.
In the dream the bishop finds itself on an `n × m` chessboard with mirrors along each edge, and it is not a bishop but a ray of light. This ray of light moves only ... |
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Polycarp was dismantling his attic and found an old floppy drive on it. A round disc was inserted into the drive with $n$ integers written on it.
Polycarp wrote the numbers from the disk into the $a$ array. It turned out that the drive works according ... |
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Devu is a dumb guy, his learning curve is very slow. You are supposed to teach him n subjects, the i^{th} subject has c_{i} chapters. When you teach him, you are supposed to teach all the chapters of a subject continuously.
Let us say that his initial ... |
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Read problems statements in Mandarin Chinese and Russian.
Spring is interesting season of year. Chef is thinking about different things, but last time he thinks about interesting game - "Strange Matrix".
Chef has a matrix that consists of n rows, eac... |
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Little Dima has two sequences of points with integer coordinates: sequence (a_1, 1), (a_2, 2), ..., (a_{n}, n) and sequence (b_1, 1), (b_2, 2), ..., (b_{n}, n).
Now Dima wants to count the number of distinct sequences of points of length 2·n that can b... |
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In the year 2168, AtCoder Inc., which is much larger than now, is starting a limited express train service called AtCoder Express.
In the plan developed by the president Takahashi, the trains will run as follows:
- A train will run for (t_1 + t_2 + t_3... |
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Theofanis really likes sequences of positive integers, thus his teacher (Yeltsa Kcir) gave him a problem about a sequence that consists of only special numbers.
Let's call a positive number special if it can be written as a sum of different non-negativ... |
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Every positive integer number, that is not prime, may be decomposed in prime factors. For example the prime factors of 20, are:
```
2, 2, and 5, because: 20 = 2 . 2 . 5
```
The first prime factor (the smallest one) of ```20``` is ```2``` and the last o... |
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A breakthrough among computer games, "Civilization XIII", is striking in its scale and elaborate details. Let's take a closer look at one of them.
The playing area in the game is split into congruent cells that are regular hexagons. The side of each ce... |
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Twilight Sparkle was playing Ludo with her friends Rainbow Dash, Apple Jack and Flutter Shy. But she kept losing. Having returned to the castle, Twilight Sparkle became interested in the dice that were used in the game.
The dice has m faces: the first ... |
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It's bonus time in the big city! The fatcats are rubbing their paws in anticipation... but who is going to make the most money?
Build a function that takes in two arguments (salary, bonus). Salary will be an integer, and bonus a boolean.
If bonus is ... |
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Polycarp lives on the coordinate axis $Ox$ and travels from the point $x=a$ to $x=b$. It moves uniformly rectilinearly at a speed of one unit of distance per minute.
On the axis $Ox$ at the point $x=c$ the base station of the mobile operator is placed.... |
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You are given a string $s$ consisting of lowercase Latin letters and $q$ queries for this string.
Recall that the substring $s[l; r]$ of the string $s$ is the string $s_l s_{l + 1} \dots s_r$. For example, the substrings of "codeforces" are "code", "fo... |
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Taro Aizu's company has a boss who hates being indivisible. When Taro goes out to eat with his boss, he pays by splitting the bill, but when the payment amount is not divisible by the number of participants, his boss always pays for it.
One day, Taro b... |
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A great king of a certain country suddenly decided to visit the land of a friendly country. The country is famous for trains, and the king visits various stations.
There are 52 train stations, each with a single uppercase or lowercase alphabetic name (... |
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Given an array of numbers, return a string made up of four parts:
a) a four character 'word', made up of the characters derived from the first two and last two numbers in the array. order should be as read left to right (first, second, second last, las... |
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This is a follow up from my kata Insert Dashes.
Write a function ```insertDashII(num)``` that will insert dashes ('-') between each two odd numbers and asterisk ('\*') between each even numbers in ```num```
For example:
```insertDashII(454793)``` -->... |
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One day Nikita found the string containing letters "a" and "b" only.
Nikita thinks that string is beautiful if it can be cut into 3 strings (possibly empty) without changing the order of the letters, where the 1-st and the 3-rd one contain only letter... |
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Hacker Zhorik wants to decipher two secret messages he intercepted yesterday. Yeah message is a sequence of encrypted blocks, each of them consists of several bytes of information.
Zhorik knows that each of the messages is an archive containing one or ... |
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First-rate specialists graduate from Berland State Institute of Peace and Friendship. You are one of the most talented students in this university. The education is not easy because you need to have fundamental knowledge in different areas, which someti... |
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You are given an array a of length n that consists of zeros and ones.
You can perform the following operation multiple times. The operation consists of two steps:
1. Choose three integers 1 ≤ x < y < z ≤ n, that form an arithmetic progression (y - ... |
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An ant moves on the real line with constant speed of $1$ unit per second. It starts at $0$ and always moves to the right (so its position increases by $1$ each second).
There are $n$ portals, the $i$-th of which is located at position $x_i$ and telepor... |
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The full exploration sister is a very talented woman. Your sister can easily count the number of routes in a grid pattern if it is in the thousands. You and your exploration sister are now in a room lined with hexagonal tiles. The older sister seems to ... |
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Ksusha is a beginner coder. Today she starts studying arrays. She has array a_1, a_2, ..., a_{n}, consisting of n positive integers.
Her university teacher gave her a task. Find such number in the array, that all array elements are divisible by it. Hel... |
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In this Kata your task will be to return the count of pairs that have consecutive numbers as follows:
```Haskell
pairs([1,2,5,8,-4,-3,7,6,5]) = 3
The pairs are selected as follows [(1,2),(5,8),(-4,-3),(7,6),5]
--the first pair is (1,2) and the numbers i... |
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Someone gave Alyona an array containing n positive integers a_1, a_2, ..., a_{n}. In one operation, Alyona can choose any element of the array and decrease it, i.e. replace with any positive integer that is smaller than the current one. Alyona can repea... |
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A positive integer number n is written on a blackboard. It consists of not more than 105 digits. You have to transform it into a beautiful number by erasing some of the digits, and you want to erase as few digits as possible.
The number is called beaut... |
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Chuck has lost count of how many asses he has kicked...
Chuck stopped counting at 100,000 because he prefers to kick things in the face instead of counting. That's just who he is.
To stop having to count like a mere mortal chuck developed his own spec... |
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While playing with geometric figures Alex has accidentally invented a concept of a $n$-th order rhombus in a cell grid.
A $1$-st order rhombus is just a square $1 \times 1$ (i.e just a cell).
A $n$-th order rhombus for all $n \geq 2$ one obtains from ... |
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Tired of boring office work, Denis decided to open a fast food restaurant.
On the first day he made $a$ portions of dumplings, $b$ portions of cranberry juice and $c$ pancakes with condensed milk.
The peculiarity of Denis's restaurant is the procedure... |
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M-kun is a brilliant air traffic controller.
On the display of his radar, there are N airplanes numbered 1, 2, ..., N, all flying at the same altitude.
Each of the airplanes flies at a constant speed of 0.1 per second in a constant direction. The curre... |
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Shell Sort
Shell Sort is a generalization of Insertion Sort to arrange a list of $n$ elements $A$.
1 insertionSort(A, n, g)
2 for i = g to n-1
3 v = A[i]
4 j = i - g
5 while j >= 0 && A[j] > v
6 A[j+g] = ... |
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Monocarp is playing a computer game. In this game, his character fights different monsters.
A fight between a character and a monster goes as follows. Suppose the character initially has health $h_C$ and attack $d_C$; the monster initially has health $... |
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The Queen of England has n trees growing in a row in her garden. At that, the i-th (1 ≤ i ≤ n) tree from the left has height a_{i} meters. Today the Queen decided to update the scenery of her garden. She wants the trees' heights to meet the condition: f... |
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VK news recommendation system daily selects interesting publications of one of n disjoint categories for each user. Each publication belongs to exactly one category. For each category i batch algorithm selects a_i publications.
The latest A/B test sugg... |
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You are given three strings A, B and C. Check whether they form a word chain.
More formally, determine whether both of the following are true:
- The last character in A and the initial character in B are the same.
- The last character in B and the ini... |
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Harry Potter and He-Who-Must-Not-Be-Named engaged in a fight to the death once again. This time they are located at opposite ends of the corridor of length l. Two opponents simultaneously charge a deadly spell in the enemy. We know that the impulse of H... |
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I assume most of you are familiar with the ancient legend of the rice (but I see wikipedia suggests [wheat](https://en.wikipedia.org/wiki/Wheat_and_chessboard_problem), for some reason) problem, but a quick recap for you: a young man asks as a compensat... |
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This problem consists of three subproblems: for solving subproblem C1 you will receive 4 points, for solving subproblem C2 you will receive 4 points, and for solving subproblem C3 you will receive 8 points.
Manao decided to pursue a fighter's career. H... |
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# Task
Elections are in progress!
Given an array of numbers representing votes given to each of the candidates, and an integer which is equal to the number of voters who haven't cast their vote yet, find the number of candidates who still have a chanc... |
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**Getting Familiar:**
LEET: (sometimes written as "1337" or "l33t"), also known as eleet or leetspeak, is another alphabet for the English language that is used mostly on the internet. It uses various combinations of ASCII characters to replace Latinate... |
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Our Chef is catering for a big corporate office party and is busy preparing different mouth watering dishes. The host has insisted that he serves his delicious cupcakes for dessert.
On the day of the party, the Chef was over-seeing all the food arrang... |
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Petya loves lucky numbers. We all know that lucky numbers are the positive integers whose decimal representations contain only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.
One day Petya encountered a tree ... |
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problem
The island where JOI lives has been invaded by zombies. JOI decided to escape to the shelter, which is set as the safest shelter on the island.
The island where JOI lives consists of N towns from town 1 to town N, and the towns are connected b... |
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Vasya decided to go to the grocery store. He found in his wallet $a$ coins of $1$ burle and $b$ coins of $2$ burles. He does not yet know the total cost of all goods, so help him find out $s$ ($s > 0$): the minimum positive integer amount of money he ca... |
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You have a digit sequence S of length 4. You are wondering which of the following formats S is in:
- YYMM format: the last two digits of the year and the two-digit representation of the month (example: 01 for January), concatenated in this order
- MMY... |
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This program tests the life of an
evaporator containing a gas.
We know the content of the evaporator (content in ml),
the percentage of foam or gas lost every day (evap_per_day)
and the threshold (threshold) in percentage beyond which
the evaporator i... |
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Read problems statements in Mandarin Chinese and Russian.
Rupsa recently started to intern under Chef. He gave her N type of ingredients of varying quantity A_{1}, A_{2}, ..., A_{N} respectively to store it. But as she is lazy to arrange them she pu... |
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According to a new ISO standard, a flag of every country should have a chequered field n × m, each square should be of one of 10 colours, and the flag should be «striped»: each horizontal row of the flag should contain squares of the same colour, and th... |
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When you play the game of thrones, you win, or you die. There is no middle ground.
Cersei Lannister, A Game of Thrones by George R. R. Martin
There are n nobles, numbered from 1 to n. Noble i has a power of i. There are also m "friendships". A friends... |
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You are given strings $S$ and $T$, consisting of lowercase English letters. It is guaranteed that $T$ is a permutation of the string abc.
Find string $S'$, the lexicographically smallest permutation of $S$ such that $T$ is not a subsequence of $S'$.
S... |
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Create a program that calculates and outputs the surface distance by inputting the north latitude and east longitude of two cities on the earth. However, the earth is a sphere with a radius of 6,378.1 km, and the surface distance between two points is t... |
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Vova promised himself that he would never play computer games... But recently Firestorm — a well-known game developing company — published their newest game, World of Farcraft, and it became really popular. Of course, Vova started playing it.
Now he tr... |
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Ivan recently bought a detective book. The book is so interesting that each page of this book introduces some sort of a mystery, which will be explained later. The $i$-th page contains some mystery that will be explained on page $a_i$ ($a_i \ge i$).
Iv... |
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In this kata, the number 0 is infected. You are given a list. Every turn, any item in the list that is adjacent to a 0 becomes infected and transforms into a 0. How many turns will it take for the whole list to become infected?
```
[0,1,1,0] ==> [0,0,0... |
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Let x be a string of length at least 1.
We will call x a good string, if for any string y and any integer k (k \geq 2), the string obtained by concatenating k copies of y is different from x.
For example, a, bbc and cdcdc are good strings, while aa, bbb... |
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Kolya got an integer array $a_1, a_2, \dots, a_n$. The array can contain both positive and negative integers, but Kolya doesn't like $0$, so the array doesn't contain any zeros.
Kolya doesn't like that the sum of some subsegments of his array can be $0... |
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Gargari got bored to play with the bishops and now, after solving the problem about them, he is trying to do math homework. In a math book he have found k permutations. Each of them consists of numbers 1, 2, ..., n in some order. Now he should find the ... |
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All cinema halls in Berland are rectangles with K rows of K seats each, and K is an odd number. Rows and seats are numbered from 1 to K. For safety reasons people, who come to the box office to buy tickets, are not allowed to choose seats themselves. Fo... |
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A palindrome is a string that reads the same backward as forward. For example, the strings "z", "aaa", "aba", and "abccba" are palindromes, but "codeforces" and "ab" are not. You hate palindromes because they give you déjà vu.
There is a string $s$. Yo... |
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It's hard times now. Today Petya needs to score 100 points on Informatics exam. The tasks seem easy to Petya, but he thinks he lacks time to finish them all, so he asks you to help with one..
There is a glob pattern in the statements (a string consisti... |
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Failed Filter - Bug Fixing #3
Oh no, Timmy's filter doesn't seem to be working? Your task is to fix the FilterNumber function to remove all the numbers from the string.
Write your solution by modifying this code:
```python
def filter_numbers(string):
... |
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From "ftying rats" to urban saniwation workers - can synthetic biology tronsform how we think of pigeons?
The upiquitous pigeon has long been viewed as vermin - spleading disease, scavenging through trush, and defecating in populous urban spases. Yet ... |
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Given is an integer sequence of length N: A_1, A_2, \cdots, A_N.
An integer sequence X, which is also of length N, will be chosen randomly by independently choosing X_i from a uniform distribution on the integers 1, 2, \ldots, A_i for each i (1 \leq i \... |
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The only difference between easy and hard versions is the number of elements in the array.
You are given an array $a$ consisting of $n$ integers. In one move you can choose any $a_i$ and divide it by $2$ rounding down (in other words, in one move you c... |
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The courier charges for a courier company are set according to size and weight as shown in the table below.
A size | B size | C size | D size | E size | F size
--- | --- | --- | --- | --- | --- | ---
Size | 60 cm or less | 80 cm or less | 100 cm or les... |
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In this Kata, we are going to determine if the count of each of the characters in a string can be equal if we remove a single character from that string.
For example:
```
solve('abba') = false -- if we remove any character, the count of each character ... |
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Vlad likes to eat in cafes very much. During his life, he has visited cafes n times. Unfortunately, Vlad started to feel that his last visits are not any different from each other. To fix that Vlad had a small research.
First of all, Vlad assigned indi... |
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AquaMoon has $n$ friends. They stand in a row from left to right, and the $i$-th friend from the left wears a T-shirt with a number $a_i$ written on it. Each friend has a direction (left or right). In the beginning, the direction of each friend is right... |
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The Two-dimensional kingdom is going through hard times... This morning the Three-Dimensional kingdom declared war on the Two-dimensional one. This (possibly armed) conflict will determine the ultimate owner of the straight line.
The Two-dimensional ki... |
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In some other world, today is the day before Christmas Eve.
Mr. Takaha is buying N items at a department store. The regular price of the i-th item (1 \leq i \leq N) is p_i yen (the currency of Japan).
He has a discount coupon, and can buy one item with ... |
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# Scenario
With **_Cereal crops_** like wheat or rice, before we can eat the grain kernel, we need to remove that inedible hull, or *to separate the wheat from the chaff*.
___
# Task
**_Given_** a *sequence of n integers* , **_separate_** *the negat... |
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Welcome young Jedi! In this Kata you must create a function that takes an amount of US currency in `cents`, and returns a dictionary/hash which shows the least amount of coins used to make up that amount. The only coin denominations considered in this e... |
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Mahmoud has an array a consisting of n integers. He asked Ehab to find another array b of the same length such that:
b is lexicographically greater than or equal to a. b_{i} ≥ 2. b is pairwise coprime: for every 1 ≤ i < j ≤ n, b_{i} and b_{j} are c... |
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You are given two positive integers ```a``` and ```b```.
You can perform the following operations on ```a``` so as to obtain ```b``` :
```
(a-1)/2 (if (a-1) is divisible by 2)
a/2 (if a is divisible by 2)
a*2
```
```b``` will always be a power ... |
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Dreamoon likes sequences very much. So he created a problem about the sequence that you can't find in OEIS:
You are given two integers d, m, find the number of arrays a, satisfying the following constraints:
* The length of a is n, n ≥ 1
* 1 ≤ a... |
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Welcome to PC Koshien, players. Physical condition management is important to participate in the event. It is said that at the turn of the season when the temperature fluctuates greatly, it puts a strain on the body and it is easy to catch a cold. The d... |
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Little Chris is a huge fan of linear algebra. This time he has been given a homework about the unusual square of a square matrix.
The dot product of two integer number vectors x and y of size n is the sum of the products of the corresponding components... |
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You are given two strings $s$ and $t$, both consisting of lowercase English letters. You are going to type the string $s$ character by character, from the first character to the last one.
When typing a character, instead of pressing the button correspo... |
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Consider a sequence generation that follows the following steps. We will store removed values in variable `res`. Assume `n = 25`:
```Haskell
-> [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25] Let's remove the first number => res = [1... |
Solve the programming task below in a Python markdown code block.
The only difference between easy and hard versions is the number of elements in the array.
You are given an array $a$ consisting of $n$ integers. In one move you can choose any $a_i$ and divide it by $2$ rounding down (in other words, in one move you c... |
Solve the programming task below in a Python markdown code block.
Many people choose to obfuscate their email address when displaying it on the Web. One common way of doing this is by substituting the `@` and `.` characters for their literal equivalents in brackets.
Example 1:
```
user_name@example.com
=> user_name [... |
Solve the programming task below in a Python markdown code block.
Squirrel Liss is interested in sequences. She also has preferences of integers. She thinks n integers a_1, a_2, ..., a_{n} are good.
Now she is interested in good sequences. A sequence x_1, x_2, ..., x_{k} is called good if it satisfies the following t... |
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