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Ayush is a cashier at the shopping center. Recently his department has started a ''click and collect" service which allows users to shop online.
The store contains k items. n customers have already used the above service. Each user paid for m items. L... |
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There are n animals in the queue to Dr. Dolittle. When an animal comes into the office, the doctor examines him, gives prescriptions, appoints tests and may appoint extra examination. Doc knows all the forest animals perfectly well and therefore knows e... |
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You are given n segments on the coordinate axis Ox and the number k. The point is satisfied if it belongs to at least k segments. Find the smallest (by the number of segments) set of segments on the coordinate axis Ox which contains all satisfied points... |
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There is enough money available on ATM in nominal value 10, 20, 50, 100, 200 and 500 dollars.
You are given money in nominal value of `n` with `1<=n<=1500`.
Try to find minimal number of notes that must be used to repay in dollars, or output -1 if it ... |
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You are given an array $a$ consisting of $n$ integers. Let's denote monotonic renumeration of array $a$ as an array $b$ consisting of $n$ integers such that all of the following conditions are met:
$b_1 = 0$; for every pair of indices $i$ and $j$ su... |
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Luba has to do n chores today. i-th chore takes a_{i} units of time to complete. It is guaranteed that for every $i \in [ 2 . . n ]$ the condition a_{i} ≥ a_{i} - 1 is met, so the sequence is sorted.
Also Luba can work really hard on some chores. She c... |
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We have a string s consisting of lowercase English letters. Snuke can perform the following operation repeatedly:
* Insert a letter `x` to any position in s of his choice, including the beginning and end of s.
Snuke's objective is to turn s into a p... |
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A schoolboy named Vasya loves reading books on programming and mathematics. He has recently read an encyclopedia article that described the method of median smoothing (or median filter) and its many applications in science and engineering. Vasya liked t... |
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You are given a keyboard that consists of $26$ keys. The keys are arranged sequentially in one row in a certain order. Each key corresponds to a unique lowercase Latin letter.
You have to type the word $s$ on this keyboard. It also consists only of low... |
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Find the number with the most digits.
If two numbers in the argument array have the same number of digits, return the first one in the array.
Write your solution by modifying this code:
```python
def find_longest(arr):
```
Your solution should imp... |
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This is the hard version of the problem. The difference between versions is the constraints on $n$ and $a_i$. You can make hacks only if all versions of the problem are solved.
First, Aoi came up with the following idea for the competitive programming ... |
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Given is a string S consisting of lowercase English letters. Find the maximum positive integer K that satisfies the following condition:
* There exists a partition of S into K non-empty strings S=S_1S_2...S_K such that S_i \neq S_{i+1} (1 \leq i \leq K... |
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n hobbits are planning to spend the night at Frodo's house. Frodo has n beds standing in a row and m pillows (n ≤ m). Each hobbit needs a bed and at least one pillow to sleep, however, everyone wants as many pillows as possible. Of course, it's not alwa... |
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The most important part of a GSM network is so called Base Transceiver Station (BTS). These transceivers form the areas called cells (this term gave the name to the cellular phone) and every phone connects to the BTS with the strongest signal (in a litt... |
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Как известно, в теплую погоду многие жители крупных городов пользуются сервисами городского велопроката. Вот и Аркадий сегодня будет добираться от школы до дома, используя городские велосипеды.
Школа и дом находятся на одной прямой улице, кроме того, н... |
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Given are strings s and t of length N each, both consisting of lowercase English letters.
Let us form a new string by alternating the characters of S and the characters of T, as follows: the first character of S, the first character of T, the second cha... |
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Read problems statements in Mandarin Chinese and Russian as well.
Given n words w[1..n], which originate from the same stem (e.g. grace, graceful, disgraceful, gracefully), we are interested in the original stem. To simplify the problem, we define the... |
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This is the hard version of the problem. The difference is the constraint on the sum of lengths of strings and the number of test cases. You can make hacks only if you solve all versions of this task.
You are given a string $s$, consisting of lowercase... |
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Implement a function/class, which should return an integer if the input string is in one of the formats specified below, or `null/nil/None` otherwise.
Format:
* Optional `-` or `+`
* Base prefix `0b` (binary), `0x` (hexadecimal), `0o` (octal), or in ca... |
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In this kata, you'll be given an integer of range `0 <= x <= 99` and have to return that number spelt out in English. A few examples:
```python
name_that_number(4) # returns "four"
name_that_number(19) # returns "nineteen"
name_that_number(99) # re... |
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It's your Birthday. Your colleagues buy you a cake. The numbers of candles on the cake is provided (x). Please note this is not reality, and your age can be anywhere up to 1,000. Yes, you would look a mess.
As a surprise, your colleagues have arranged ... |
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An Ironman Triathlon is one of a series of long-distance triathlon races organized by the World Triathlon Corporaion (WTC).
It consists of a 2.4-mile swim, a 112-mile bicycle ride and a marathon (26.2-mile) (run, raced in that order and without a break.... |
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You are given N real values A_1, A_2, \ldots, A_N. Compute the number of pairs of indices (i, j) such that i < j and the product A_i \cdot A_j is integer.
Constraints
* 2 \leq N \leq 200\,000
* 0 < A_i < 10^4
* A_i is given with at most 9 digits after... |
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Counting sort can be used for sorting elements in an array which each of the n input elements is an integer in the range 0 to k. The idea of counting sort is to determine, for each input element x, the number of elements less than x as C[x]. This inform... |
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International Women's Day is coming soon! Polycarp is preparing for the holiday.
There are $n$ candy boxes in the shop for sale. The $i$-th box contains $d_i$ candies.
Polycarp wants to prepare the maximum number of gifts for $k$ girls. Each gift will... |
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Problem
Given the strings $ s $, $ t $.
First, let the string set $ A = $ {$ s $}, $ B = \ phi $.
At this time, I want to perform the following operations as much as possible.
operation
step1
Perform the following processing for all $ u ∊ A $.
1. F... |
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You've gotten an n × m sheet of squared paper. Some of its squares are painted. Let's mark the set of all painted squares as A. Set A is connected. Your task is to find the minimum number of squares that we can delete from set A to make it not connected... |
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There are $n$ persons who initially don't know each other. On each morning, two of them, who were not friends before, become friends.
We want to plan a trip for every evening of $m$ days. On each trip, you have to select a group of people that will go ... |
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Correct this code so that it takes one argument, `x`, and returns "`x` is more than zero" if `x` is positive (and nonzero), and otherwise, returns "`x` is equal to or less than zero." In both cases, replace `x` with the actual value of `x`.
Write your ... |
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When Valera has got some free time, he goes to the library to read some books. Today he's got t free minutes to read. That's why Valera took n books in the library and for each book he estimated the time he is going to need to read it. Let's number the ... |
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Om Nom is the main character of a game "Cut the Rope". He is a bright little monster who likes visiting friends living at the other side of the park. However the dark old parks can scare even somebody as fearless as Om Nom, so he asks you to help him. [... |
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Vlad enjoys listening to music. He lives in Sam's Town. A few days ago he had a birthday, so his parents gave him a gift: MP3-player! Vlad was the happiest man in the world! Now he can listen his favorite songs whenever he wants!
Vlad built up his own p... |
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This is a follow-up from my previous Kata which can be found here: http://www.codewars.com/kata/5476f4ca03810c0fc0000098
This time, for any given linear sequence, calculate the function [f(x)] and return it as a function in Javascript or Lambda/Block i... |
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You are given three words s_1, s_2 and s_3, each composed of lowercase English letters, with spaces in between.
Print the acronym formed from the uppercased initial letters of the words.
-----Constraints-----
- s_1, s_2 and s_3 are composed of lowerca... |
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The Smart Beaver from ABBYY came up with another splendid problem for the ABBYY Cup participants! This time the Beaver invites the contest participants to check out a problem on sorting documents by their subjects. Let's describe the problem:
You've go... |
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How to make a cake you'll never eat.
Ingredients.
* 2 carrots
* 0 calories
* 100 g chocolate spread
* 1 pack of flour
* 1 egg
Method.
1. Put calories into the mixing bowl.
2. Take carrots from refrigerator.
3. Chop carrots.
4. ... |
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## Description
Your job is to create a simple password validation function, as seen on many websites.
The rules for a valid password are as follows:
- There needs to be at least 1 uppercase letter.
- There needs to be at least 1 lowercase letter.
- Th... |
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Sereja showed an interesting game to his friends. The game goes like that. Initially, there is a table with an empty cup and n water mugs on it. Then all players take turns to move. During a move, a player takes a non-empty mug of water and pours all wa... |
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Being stuck at home, Ray became extremely bored. To pass time, he asks Lord Omkar to use his time bending power: Infinity Clock! However, Lord Omkar will only listen to mortals who can solve the following problem:
You are given an array $a$ of $n$ inte... |
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You are given a chessboard of size $n \times n$. It is filled with numbers from $1$ to $n^2$ in the following way: the first $\lceil \frac{n^2}{2} \rceil$ numbers from $1$ to $\lceil \frac{n^2}{2} \rceil$ are written in the cells with even sum of coordi... |
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There is an integer sequence of length 2^N: A_0, A_1, ..., A_{2^N-1}. (Note that the sequence is 0-indexed.)
For every integer K satisfying 1 \leq K \leq 2^N-1, solve the following problem:
- Let i and j be integers. Find the maximum value of A_i + A_j... |
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This is an interactive problem. In the output section below you will see the information about flushing the output.
Bear Limak thinks of some hidden number — an integer from interval [2, 100]. Your task is to say if the hidden number is prime or compos... |
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You are given $n$ segments on a coordinate axis $OX$. The $i$-th segment has borders $[l_i; r_i]$. All points $x$, for which $l_i \le x \le r_i$ holds, belong to the $i$-th segment.
Your task is to choose the maximum by size (the number of segments) su... |
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There is a string $s$ of length $3$, consisting of uppercase and lowercase English letters. Check if it is equal to "YES" (without quotes), where each letter can be in any case. For example, "yES", "Yes", "yes" are all allowable.
-----Input-----
The ... |
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You have $n$ chains, the $i$-th chain consists of $c_i$ vertices. Vertices in each chain are numbered independently from $1$ to $c_i$ along the chain. In other words, the $i$-th chain is the undirected graph with $c_i$ vertices and $(c_i - 1)$ edges con... |
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Once upon a time in the Kingdom of Far Far Away lived Sir Lancelot, the chief Royal General. He was very proud of his men and he liked to invite the King to come and watch drill exercises which demonstrated the fighting techniques and tactics of the squ... |
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Paw the Spider is making a web. Web-making is a real art, Paw has been learning to do it his whole life. Let's consider the structure of the web.
<image>
There are n main threads going from the center of the web. All main threads are located in one pl... |
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The polar bears are going fishing. They plan to sail from (s_{x}, s_{y}) to (e_{x}, e_{y}). However, the boat can only sail by wind. At each second, the wind blows in one of these directions: east, south, west or north. Assume the boat is currently at (... |
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The time is 2020. There is data that saves the qualifying results of PC Koshien 2020. This data stores the reference number and the number of correct answers assigned to each team. Here, the ranking is determined by the number of correct answers, and th... |
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Sonya decided that having her own hotel business is the best way of earning money because she can profit and rest wherever she wants.
The country where Sonya lives is an endless line. There is a city in each integer coordinate on this line. She has $n$... |
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Let S be the concatenation of 10^{10} copies of the string 110. (For reference, the concatenation of 3 copies of 110 is 110110110.)
We have a string T of length N.
Find the number of times T occurs in S as a contiguous substring.
-----Constraints-----
... |
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"Fukusekiken" is a popular ramen shop where you can line up. But recently, I've heard some customers say, "I can't afford to have vacant seats when I enter the store, even though I have a long waiting time." I'd like to find out why such dissatisfaction... |
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Recently, the Fair Nut has written $k$ strings of length $n$, consisting of letters "a" and "b". He calculated $c$ — the number of strings that are prefixes of at least one of the written strings. Every string was counted only one time.
Then, he lost h... |
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It's a walking tour day in SIS.Winter, so $t$ groups of students are visiting Torzhok. Streets of Torzhok are so narrow that students have to go in a row one after another.
Initially, some students are angry. Let's describe a group of students by a str... |
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Simple, remove the spaces from the string, then return the resultant string.
~~~if:c
For C, you must return a new dynamically allocated string.
~~~
Write your solution by modifying this code:
```python
def no_space(x):
```
Your solution should imp... |
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On some day in January 2018, Takaki is writing a document. The document has a column where the current date is written in yyyy/mm/dd format. For example, January 23, 2018 should be written as 2018/01/23.
After finishing the document, she noticed that sh... |
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Write a function, `persistence`, that takes in a positive parameter `num` and returns its multiplicative persistence, which is the number of times you must multiply the digits in `num` until you reach a single digit.
For example:
```python
persistenc... |
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Elections in Berland are coming. There are only two candidates — Alice and Bob.
The main Berland TV channel plans to show political debates. There are $n$ people who want to take part in the debate as a spectator. Each person is described by their infl... |
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## The Riddle
The King of a small country invites 1000 senators to his annual party. As a tradition, each senator brings the King a bottle of wine. Soon after, the Queen discovers that one of the senators is trying to assassinate the King by giving him... |
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Assume that you have $k$ one-dimensional segments $s_1, s_2, \dots s_k$ (each segment is denoted by two integers — its endpoints). Then you can build the following graph on these segments. The graph consists of $k$ vertexes, and there is an edge between... |
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The only difference between easy and hard versions is on constraints. In this version constraints are lower. You can make hacks only if all versions of the problem are solved.
Koa the Koala is at the beach!
The beach consists (from left to right) of a... |
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After the mysterious disappearance of Ashish, his two favourite disciples Ishika and Hriday, were each left with one half of a secret message. These messages can each be represented by a permutation of size $n$. Let's call them $a$ and $b$.
Note that a... |
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The Little Elephant likes permutations. This time he has a permutation A[1], A[2], ..., A[N] of numbers 1, 2, ..., N.
He calls a permutation A good, if the number of its inversions is equal to the number of its local inversions. The number of inversion... |
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Shinya watched a program on TV called "Maya's Great Prophecy! Will the World End in 2012?" After all, I wasn't sure if the world would end, but I was interested in Maya's "long-term calendar," which was introduced in the program. The program explained a... |
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It is a complicated version of problem F1. The difference between them is the constraints (F1: $k \le 2$, F2: $k \le 10$).
You are given an integer $n$. Find the minimum integer $x$ such that $x \ge n$ and the number $x$ is $k$-beautiful.
A number is ... |
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There is a toy building consisting of $n$ towers. Each tower consists of several cubes standing on each other. The $i$-th tower consists of $h_i$ cubes, so it has height $h_i$.
Let's define operation slice on some height $H$ as following: for each towe... |
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Anton's favourite geometric figures are regular polyhedrons. Note that there are five kinds of regular polyhedrons:
Tetrahedron. Tetrahedron has 4 triangular faces. Cube. Cube has 6 square faces. Octahedron. Octahedron has 8 triangular faces. Dod... |
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# Task
Given an array `arr` and a number `n`. Call a pair of numbers from the array a `Perfect Pair` if their sum is equal to `n`.
Find all of the perfect pairs and return the sum of their **indices**.
Note that any element of the array can only ... |
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Evil organizations that attempt to conquer the world are everywhere, regardless of age, east or west fiction, non-fiction, but what on earth did they try to conquer the world? I suddenly thought about that because I was also planning to conquer the worl... |
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The problem was inspired by Pied Piper story. After a challenge from Hooli's compression competitor Nucleus, Richard pulled an all-nighter to invent a new approach to compression: middle-out.
You are given two strings $s$ and $t$ of the same length $n$... |
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The Beroil corporation structure is hierarchical, that is it can be represented as a tree. Let's examine the presentation of this structure as follows:
* employee ::= name. | name:employee1,employee2, ... ,employeek.
* name ::= name of an employee ... |
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You were lucky enough to get a map just before entering the legendary magical mystery world. The map shows the whole area of your planned exploration, including several countries with complicated borders. The map is clearly drawn, but in sepia ink only;... |
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Running with barriers on the circle track is very popular in the country where Dasha lives, so no wonder that on her way to classes she saw the following situation:
The track is the circle with length L, in distinct points of which there are n barriers... |
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coastline
Waves rush to the beach every second. There is data that observes and records how many meters the wave rushed beyond the reference point P every second for only T seconds. The data consists of T integers x1, ..., xT, and for each i (1 ≤ i ≤ T... |
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One day, as Sherlock Holmes was tracking down one very important criminal, he found a wonderful painting on the wall. This wall could be represented as a plane. The painting had several concentric circles that divided the wall into several parts. Some p... |
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If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
Finish the solution so that it returns the sum of all the multiples of 3 or 5 **below** the number passed in.
> Note: If... |
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Today on a lecture about strings Gerald learned a new definition of string equivalency. Two strings a and b of equal length are called equivalent in one of the two cases: They are equal. If we split string a into two halves of the same size a_1 and a... |
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[Image]
-----Input-----
The input contains a single integer $a$ ($0 \le a \le 15$).
-----Output-----
Output a single integer.
-----Example-----
Input
3
Output
13
Read the inputs from stdin solve the problem and write the answer to stdout (do... |
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###Lucky number
Write a function to find if a number is lucky or not. If the sum of all digits is 0 or multiple of 9 then the number is lucky.
`1892376 => 1+8+9+2+3+7+6 = 36`. 36 is divisble by 9, hence number is lucky.
Function will return `true` f... |
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Create a function finalGrade, which calculates the final grade of a student depending on two parameters: a grade for the exam and a number of completed projects.
This function should take two arguments:
exam - grade for exam (from 0 to 100);
projects -... |
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Smart Beaver recently got interested in a new word game. The point is as follows: count the number of distinct good substrings of some string s. To determine if a string is good or not the game uses rules. Overall there are n rules. Each rule is describ... |
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Skier rides on a snowy field. Its movements can be described by a string of characters 'S', 'N', 'W', 'E' (which correspond to $1$ meter movement in the south, north, west or east direction respectively).
It is known that if he moves along a previously... |
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Balph is learning to play a game called Buma. In this game, he is given a row of colored balls. He has to choose the color of one new ball and the place to insert it (between two balls, or to the left of all the balls, or to the right of all the balls).... |
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Every day, N passengers arrive at Takahashi Airport. The i-th passenger arrives at time T_i.
Every passenger arrived at Takahashi airport travels to the city by bus. Each bus can accommodate up to C passengers. Naturally, a passenger cannot take a bus ... |
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William really likes the cellular automaton called "Game of Life" so he decided to make his own version. For simplicity, William decided to define his cellular automaton on an array containing $n$ cells, with each cell either being alive or dead.
Evolu... |
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In the Jambo Amusement Garden (JAG), you sell colorful drinks consisting of multiple color layers. This colorful drink can be made by pouring multiple colored liquids of different density from the bottom in order.
You have already prepared several colo... |
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Quantum mechanics tells us that a molecule is only allowed to have specific, discrete amounts of internal energy. The 'rigid rotor model', a model for describing rotations, tells us that the amount of rotational energy a molecule can have is given by: ... |
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Kattapa, as you all know was one of the greatest warriors of his time. The kingdom of Maahishmati had never lost a battle under him (as army-chief), and the reason for that was their really powerful army, also called as Mahasena.
Kattapa was known to be... |
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Chef loves to play games. Now he plays very interesting game called "Segment". At the beginning Chef has segment [0, X] and no points on it. On each step Chef chooses the subsegment of maximal length possible such as it contains no points on it. If ther... |
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As Sherlock Holmes was investigating another crime, he found a certain number of clues. Also, he has already found direct links between some of those clues. The direct links between the clues are mutual. That is, the direct link between clues A and B an... |
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You are given the current time in 24-hour format hh:mm. Find and print the time after a minutes.
Note that you should find only the time after a minutes, see the examples to clarify the problem statement.
You can read more about 24-hour format here ht... |
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Nickname Generator
Write a function, `nicknameGenerator` that takes a string name as an argument and returns the first 3 or 4 letters as a nickname.
If the 3rd letter is a consonant, return the first 3 letters.
If the 3rd letter is a vowel, return th... |
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Problem statement
There is a positive integer sequence $ a_1, a_2, \ ldots, a_N $ of length $ N $.
Consider the following game, which uses this sequence and is played by $ 2 $ players on the play and the play.
* Alternately select one of the followin... |
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Given a positive integer $k$, two arrays are called $k$-similar if:
they are strictly increasing;
they have the same length;
all their elements are positive integers between $1$ and $k$ (inclusive);
they differ in exactly one position.
You are give... |
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A convex polygon consisting of N vertices is given. The coordinates of each vertex are represented counterclockwise by (X1, Y1), (X2, Y2), ……, (XN, YN). No matter what straight line passes through the point P, find the coordinates of the point P so that... |
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Mike and some bears are playing a game just for fun. Mike is the judge. All bears except Mike are standing in an n × m grid, there's exactly one bear in each cell. We denote the bear standing in column number j of row number i by (i, j). Mike's hands ar... |
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Vasya is very upset that many people on the Net mix uppercase and lowercase letters in one word. That's why he decided to invent an extension for his favorite browser that would change the letters' register in every word so that it either only consisted... |
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Takahashi has K 500-yen coins. (Yen is the currency of Japan.)
If these coins add up to X yen or more, print Yes; otherwise, print No.
-----Constraints-----
- 1 \leq K \leq 100
- 1 \leq X \leq 10^5
-----Input-----
Input is given from Standard Input ... |
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