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Consider a tunnel on a one-way road. During a particular day, $n$ cars numbered from $1$ to $n$ entered and exited the tunnel exactly once. All the cars passed through the tunnel at constant speeds.
A traffic enforcement camera is mounted at the tunnel... |
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There are n banks in the city where Vasya lives, they are located in a circle, such that any two banks are neighbouring if their indices differ by no more than 1. Also, bank 1 and bank n are neighbours if n > 1. No bank is a neighbour of itself.
Vasya ... |
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There are n servers in a laboratory, each of them can perform tasks. Each server has a unique id — integer from 1 to n.
It is known that during the day q tasks will come, the i-th of them is characterized with three integers: t_{i} — the moment in seco... |
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Cengiz recently learned Fibonacci numbers and now he is studying different algorithms to find them. After getting bored of reading them, he came with his own new type of numbers that he named XORinacci numbers. He defined them as follows: $f(0) = a$; ... |
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Bike loves looking for the second maximum element in the sequence. The second maximum element in the sequence of distinct numbers x_1, x_2, ..., x_{k} (k > 1) is such maximum element x_{j}, that the following inequality holds: $x_{j} \neq \operatorname{... |
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Holidays are coming up really soon. Rick realized that it's time to think about buying a traditional spruce tree. But Rick doesn't want real trees to get hurt so he decided to find some in an $n \times m$ matrix consisting of "*" and ".".
To find every... |
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I, Fischl, Prinzessin der Verurteilung, descend upon this land by the call of fate an — Oh, you are also a traveler from another world? Very well, I grant you permission to travel with me.
It is no surprise Fischl speaks with a strange choice of words.... |
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Polar bears Menshykov and Uslada from the zoo of St. Petersburg and elephant Horace from the zoo of Kiev decided to build a house of cards. For that they've already found a hefty deck of n playing cards. Let's describe the house they want to make:
1... |
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You have an initially empty cauldron, and you want to brew a potion in it. The potion consists of two ingredients: magic essence and water. The potion you want to brew should contain exactly $k\ \%$ magic essence and $(100 - k)\ \%$ water.
In one step,... |
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Let's arrange a deck of cards. There are totally 36 cards of 4 suits(S, H, C, D) and 9 values (1, 2, ... 9). For example, 'eight of heart' is represented by H8 and 'one of diamonds' is represented by D1.
Your task is to write a program which sorts a gi... |
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Aiz, which is located in cyberspace, trades information with Wakamatsu. The two countries are developing their economies by exchanging useful data with each other. The two countries, whose national policy is philanthropy and equality, and above all, the... |
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Niwango created a playlist of N songs. The title and the duration of the i-th song are s_i and t_i seconds, respectively. It is guaranteed that s_1,\ldots,s_N are all distinct.
Niwango was doing some work while playing this playlist. (That is, all the ... |
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The first algorithm for detecting a face on the image working in realtime was developed by Paul Viola and Michael Jones in 2001. A part of the algorithm is a procedure that computes Haar features. As part of this task, we consider a simplified model of ... |
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Petya loves football very much, especially when his parents aren't home. Each morning he comes to the yard, gathers his friends and they play all day. From time to time they have a break to have some food or do some chores (for example, water the flower... |
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You are given an integer N. Build an undirected graph with N vertices with indices 1 to N that satisfies the following two conditions:
* The graph is simple and connected.
* There exists an integer S such that, for every vertex, the sum of the indices ... |
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There are $n$ students numerated from $1$ to $n$. The level of the $i$-th student is $a_i$. You need to split the students into stable groups. A group of students is called stable, if in the sorted array of their levels no two neighboring elements diffe... |
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You have a tree of $n$ vertices. You are going to convert this tree into $n$ rubber bands on infinitely large plane. Conversion rule follows:
For every pair of vertices $a$ and $b$, rubber bands $a$ and $b$ should intersect if and only if there is an e... |
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A + B is often used as an example of the easiest problem possible to show some contest platform. However, some scientists have observed that sometimes this problem is not so easy to get accepted. Want to try?
-----Input-----
The input contains two in... |
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_A mad sociopath scientist just came out with a brilliant invention! He extracted his own memories to forget all the people he hates! Now there's a lot of information in there, so he needs your talent as a developer to automatize that task for him._
> ... |
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You play a computer game. Your character stands on some level of a multilevel ice cave. In order to move on forward, you need to descend one level lower and the only way to do this is to fall through the ice.
The level of the cave where you are is a re... |
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Lucy loves to travel. Luckily she is a renowned computer scientist and gets to travel to international conferences using her department's budget.
Each year, Society for Exciting Computer Science Research (SECSR) organizes several conferences around the... |
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Read problems statements in Mandarin Chinese and Russian.
N one dimensional kingdoms are represented as intervals of the form [a_{i} , b_{i}] on the real line.
A kingdom of the form [L, R] can be destroyed completely by placing a bomb at a point x on... |
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You are given a string S consisting of letters `b`, `d`, `p` and `q`. Determine whether S is a mirror string.
Here, a mirror string is a string S such that the following sequence of operations on S results in the same string S:
1. Reverse the order of... |
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The USA Construction Operation (USACO) recently ordered Farmer John to arrange a row of $n$ haybale piles on the farm. The $i$-th pile contains $a_i$ haybales.
However, Farmer John has just left for vacation, leaving Bessie all on her own. Every day, ... |
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Amr bought a new video game "Guess Your Way Out! II". The goal of the game is to find an exit from the maze that looks like a perfect binary tree of height h. The player is initially standing at the root of the tree and the exit from the tree is located... |
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There are N positive integers A_1, A_2, ..., A_N. Takahashi can perform the following operation on these integers any number of times:
* Choose 1 \leq i \leq N and multiply the value of A_i by -2.
Notice that he multiplies it by minus two.
He would... |
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Snuke has an integer sequence A of length N.
He will make three cuts in A and divide it into four (non-empty) contiguous subsequences B, C, D and E. The positions of the cuts can be freely chosen.
Let P,Q,R,S be the sums of the elements in B,C,D,E, re... |
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Vasya has an array a_1, a_2, ..., a_n.
You don't know this array, but he told you m facts about this array. The i-th fact is a triple of numbers t_i, l_i and r_i (0 ≤ t_i ≤ 1, 1 ≤ l_i < r_i ≤ n) and it means:
* if t_i=1 then subbarray a_{l_i}, a_{l_... |
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In April 2008, Aizuwakamatsu City succeeded in making yakitori with a length of 20 m 85 cm. The chicken used at this time is Aizu local chicken, which is a specialty of Aizu. Aizu local chicken is very delicious, but it is difficult to breed, so the pro... |
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This problem is same as the previous one, but has larger constraints.
Shiro's just moved to the new house. She wants to invite all friends of her to the house so they can play monopoly. However, her house is too small, so she can only invite one friend... |
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Your task is to create function```isDivideBy``` (or ```is_divide_by```) to check if an integer number is divisible by each out of two arguments.
A few cases:
```
(-12, 2, -6) -> true
(-12, 2, -5) -> false
(45, 1, 6) -> false
(45, 5, 15) ->... |
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Vova is playing a computer game. There are in total $n$ turns in the game and Vova really wants to play all of them. The initial charge of his laptop battery (i.e. the charge before the start of the game) is $k$.
During each turn Vova can choose what t... |
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AtCoDeer the deer is seeing a quick report of election results on TV.
Two candidates are standing for the election: Takahashi and Aoki.
The report shows the ratio of the current numbers of votes the two candidates have obtained, but not the actual numbe... |
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Welcome to Codeforces Stock Exchange! We're pretty limited now as we currently allow trading on one stock, Codeforces Ltd. We hope you'll still be able to make profit from the market!
In the morning, there are $n$ opportunities to buy shares. The $i$-t... |
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Arya has n opponents in the school. Each day he will fight with all opponents who are present this day. His opponents have some fighting plan that guarantees they will win, but implementing this plan requires presence of them all. That means if one day ... |
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You are given a sequence of positive integers a_1, a_2, ..., a_{n}.
While possible, you perform the following operation: find a pair of equal consecutive elements. If there are more than one such pair, find the leftmost (with the smallest indices of e... |
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Let us define the FizzBuzz sequence a_1,a_2,... as follows:
- If both 3 and 5 divides i, a_i=\mbox{FizzBuzz}.
- If the above does not hold but 3 divides i, a_i=\mbox{Fizz}.
- If none of the above holds but 5 divides i, a_i=\mbox{Buzz}.
- If none of ... |
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Little Petya very much likes arrays consisting of n integers, where each of them is in the range from 1 to 109, inclusive. Recently he has received one such array as a gift from his mother. Petya didn't like it at once. He decided to choose exactly one ... |
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One of the first algorithm used for approximating the integer square root of a positive integer `n` is known as "Hero's method",
named after the first-century Greek mathematician Hero of Alexandria who gave the first description
of the method. Hero's m... |
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A positive integer X is said to be a lunlun number if and only if the following condition is satisfied:
- In the base ten representation of X (without leading zeros), for every pair of two adjacent digits, the absolute difference of those digits is at ... |
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Write a program which reads a $n \times m$ matrix $A$ and a $m \times l$ matrix $B$, and prints their product, a $n \times l$ matrix $C$. An element of matrix $C$ is obtained by the following formula:
\\[ c_{ij} = \sum_{k=1}^m a_{ik}b_{kj} \\]
where $... |
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There is a set of cards with positive integers written on them. Stack the cards to make several piles and arrange them side by side. Select two adjacent piles of cards from them, and stack the left pile on top of the right pile. Repeat this operation un... |
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There are N islands lining up from west to east, connected by N-1 bridges.
The i-th bridge connects the i-th island from the west and the (i+1)-th island from the west.
One day, disputes took place between some islands, and there were M requests from th... |
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-----Input-----
The input contains a single integer a (1 ≤ a ≤ 64).
-----Output-----
Output a single integer.
-----Examples-----
Input
2
Output
1
Input
4
Output
2
Input
27
Output
5
Input
42
Output
6
Read the inputs from stdin solve the pro... |
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Well, those numbers were right and we're going to feed their ego.
Write a function, isNarcissistic, that takes in any amount of numbers and returns true if all the numbers are narcissistic. Return false for invalid arguments (numbers passed in as strin... |
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Grandma Capa has decided to knit a scarf and asked Grandpa Sher to make a pattern for it, a pattern is a string consisting of lowercase English letters. Grandpa Sher wrote a string $s$ of length $n$.
Grandma Capa wants to knit a beautiful scarf, and in... |
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Petya loves lucky numbers. Everybody knows that lucky numbers are positive integers whose decimal representation contains only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.
One day Petya dreamt of a lexicog... |
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Late last night in the Tanner household, ALF was repairing his spaceship so he might get back to Melmac. Unfortunately for him, he forgot to put on the parking brake, and the spaceship took off during repair. Now it's hovering in space.
ALF has the tec... |
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# Task
Christmas is coming. In the [previous kata](https://www.codewars.com/kata/5a405ba4e1ce0e1d7800012e), we build a custom Christmas tree with the specified characters and the specified height.
Now, we are interested in the center of the Christmas ... |
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A burglar got into a matches warehouse and wants to steal as many matches as possible. In the warehouse there are m containers, in the i-th container there are ai matchboxes, and each matchbox contains bi matches. All the matchboxes are of the same size... |
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Vasya became interested in bioinformatics. He's going to write an article about similar cyclic DNA sequences, so he invented a new method for determining the similarity of cyclic sequences.
Let's assume that strings s and t have the same length n, then... |
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There are N children in AtCoder Kindergarten. Mr. Evi will arrange the children in a line, then give 1 candy to the first child in the line, 2 candies to the second child, ..., N candies to the N-th child. How many candies will be necessary in total?
-... |
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A kindergarten teacher Natalia Pavlovna has invented a new ball game. This game not only develops the children's physique, but also teaches them how to count.
The game goes as follows. Kids stand in circle. Let's agree to think of the children as numb... |
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Let's call a string a phone number if it has length 11 and fits the pattern "8xxxxxxxxxx", where each "x" is replaced by a digit.
For example, "80123456789" and "80000000000" are phone numbers, while "8012345678" and "79000000000" are not.
You have $n... |
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There are n heroes fighting in the arena. Initially, the i-th hero has a_i health points.
The fight in the arena takes place in several rounds. At the beginning of each round, each alive hero deals 1 damage to all other heroes. Hits of all heroes occur... |
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One day, after a difficult lecture a diligent student Sasha saw a graffitied desk in the classroom. She came closer and read: "Find such positive integer n, that among numbers n + 1, n + 2, ..., 2·n there are exactly m numbers which binary representatio... |
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You have full control over a robot that walks around in a rectangular field paved with square tiles like a chessboard. There are m columns of tiles from west to east, and n rows of tiles from south to north (1 <= m, n <= 100). Each tile is given a pair ... |
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In this Kata we are passing a number (n) into a function.
Your code will determine if the number passed is even (or not).
The function needs to return either a true or false.
Numbers may be positive or negative, integers or floats.
Floats are con... |
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We have a 3×3 square grid, where each square contains a lowercase English letters.
The letter in the square at the i-th row from the top and j-th column from the left is c_{ij}.
Print the string of length 3 that can be obtained by concatenating the lett... |
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The Resistance is trying to take control over as many planets of a particular solar system as possible. Princess Heidi is in charge of the fleet, and she must send ships to some planets in order to maximize the number of controlled planets.
The Galaxy ... |
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Polycarp is very careful. He even types numeric sequences carefully, unlike his classmates. If he sees a sequence without a space after the comma, with two spaces in a row, or when something else does not look neat, he rushes to correct it. For example,... |
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You survived several months of exam wars and were able to enter ICPC University on a sunny day. On the day of admission, there was an enthusiastic recruitment of circles on the campus of the university, and you received a large number of pamphlets and r... |
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You are given an integer array $a_1, a_2, \ldots, a_n$.
The array $b$ is called to be a subsequence of $a$ if it is possible to remove some elements from $a$ to get $b$.
Array $b_1, b_2, \ldots, b_k$ is called to be good if it is not empty and for eve... |
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Limak can repeatedly remove one of the first two characters of a string, for example abcxyx \rightarrow acxyx \rightarrow cxyx \rightarrow cyx.
You are given N different strings S_1, S_2, \ldots, S_N. Among N \cdot (N-1) / 2 pairs (S_i, S_j), in how ma... |
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Polycarp is very fond of playing the game Minesweeper. Recently he found a similar game and there are such rules.
There are mines on the field, for each the coordinates of its location are known ($x_i, y_i$). Each mine has a lifetime in seconds, after ... |
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Let's call a list of positive integers $a_0, a_1, ..., a_{n-1}$ a power sequence if there is a positive integer $c$, so that for every $0 \le i \le n-1$ then $a_i = c^i$.
Given a list of $n$ positive integers $a_0, a_1, ..., a_{n-1}$, you are allowed t... |
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Everybody knows that the m-coder Tournament will happen soon. m schools participate in the tournament, and only one student from each school participates.
There are a total of n students in those schools. Before the tournament, all students put their n... |
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Memory is now interested in the de-evolution of objects, specifically triangles. He starts with an equilateral triangle of side length x, and he wishes to perform operations to obtain an equilateral triangle of side length y.
In a single second, he can... |
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We have an undirected graph G with N vertices numbered 1 to N and N edges as follows:
- For each i=1,2,...,N-1, there is an edge between Vertex i and Vertex i+1.
- There is an edge between Vertex X and Vertex Y.
For each k=1,2,...,N-1, solve the probl... |
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Create a program that converts the date expressed in the Christian era to the Japanese calendar using the era name and outputs the date. The input is three integers, as shown in the example, in the order year, month, and day. Convert this as shown in th... |
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Dwarfs have planted a very interesting plant, which is a triangle directed "upwards". This plant has an amusing feature. After one year a triangle plant directed "upwards" divides into four triangle plants: three of them will point "upwards" and one wil... |
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You are given an array $a_1, a_2, \dots, a_n$, consisting of $n$ positive integers.
Initially you are standing at index $1$ and have a score equal to $a_1$. You can perform two kinds of moves: move right — go from your current index $x$ to $x+1$ and... |
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Make a program that takes a value (x) and returns "Bang" if the number is divisible by 3, "Boom" if it is divisible by 5, "BangBoom" if it divisible by 3 and 5, and "Miss" if it isn't divisible by any of them.
Note: Your program should only return one v... |
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Tashizan Hikizan (Calculation Training)
square1001 You gave E869120 two numbers, $ A $ and $ B $, as birthday presents.
E869120 You decided to use these two numbers for calculation training.
Specifically, E869120 does the following for these numbers ... |
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Find the least common multiple (LCM) of given n integers.
Constraints
* 2 ≤ n ≤ 10
* 1 ≤ ai ≤ 1000
* Product of given integers ai(i = 1, 2, ... n) does not exceed 231-1
Input
n
a1 a2 ... an
n is given in the first line. Then, n integers are given... |
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Gotou just received a dictionary. However, he doesn't recognize the language used in the dictionary. He did some analysis on the dictionary and realizes that the dictionary contains all possible diverse words in lexicographical order.
A word is called ... |
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A pair of numbers has a unique LCM but a single number can be the LCM of more than one possible
pairs. For example `12` is the LCM of `(1, 12), (2, 12), (3,4)` etc. For a given positive integer N, the number of different integer pairs with LCM is equal ... |
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In this problem we consider a special type of an auction, which is called the second-price auction. As in regular auction n bidders place a bid which is price a bidder ready to pay. The auction is closed, that is, each bidder secretly informs the organi... |
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Cat Snuke is learning to write characters.
Today, he practiced writing digits 1 and 9, but he did it the other way around.
You are given a three-digit integer n written by Snuke.
Print the integer obtained by replacing each digit 1 with 9 and each digit... |
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Lee tried so hard to make a good div.2 D problem to balance his recent contest, but it still doesn't feel good at all. Lee invented it so tediously slow that he managed to develop a phobia about div.2 D problem setting instead. And now he is hiding behi... |
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The robot is located on a checkered rectangular board of size $n \times m$ ($n$ rows, $m$ columns). The rows in the board are numbered from $1$ to $n$ from top to bottom, and the columns — from $1$ to $m$ from left to right.
The robot is able to move f... |
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A famous gang of pirates, Sea Dogs, has come back to their hideout from one of their extravagant plunders. They want to split their treasure fairly amongst themselves, that is why You, their trusted financial advisor, devised a game to help them:
All o... |
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In the spirit of the holidays, Saitama has given Genos two grid paths of length n (a weird gift even by Saitama's standards). A grid path is an ordered sequence of neighbouring squares in an infinite grid. Two squares are neighbouring if they share a si... |
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Your task is to write a program which reads a text and prints two words. The first one is the word which is arise most frequently in the text. The second one is the word which has the maximum number of letters.
The text includes only alphabetical chara... |
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Complete the function that accepts a string parameter, and reverses each word in the string. **All** spaces in the string should be retained.
## Examples
```
"This is an example!" ==> "sihT si na !elpmaxe"
"double spaces" ==> "elbuod secaps"
```... |
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Anna and Maria are in charge of the math club for junior students. When the club gathers together, the students behave badly. They've brought lots of shoe laces to the club and got tied with each other. Specifically, each string ties together two studen... |
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Polycarpus takes part in the "Field of Wonders" TV show. The participants of the show have to guess a hidden word as fast as possible. Initially all the letters of the word are hidden.
The game consists of several turns. At each turn the participant te... |
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Write a program to simulate rolling a dice, which can be constructed by the following net.
<image>
<image>
As shown in the figures, each face is identified by a different label from 1 to 6.
Write a program which reads integers assigned to each fa... |
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In Berland the opposition is going to arrange mass walking on the boulevard. The boulevard consists of n tiles that are lain in a row and are numbered from 1 to n from right to left. The opposition should start walking on the tile number 1 and the finis... |
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Petya loves lucky numbers very much. Everybody knows that lucky numbers are positive integers whose decimal record contains only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.
Petya loves tickets very much. ... |
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We have a string S consisting of uppercase English letters. Additionally, an integer N will be given.
Shift each character of S by N in alphabetical order (see below), and print the resulting string.
We assume that A follows Z. For example, shifting A b... |
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Joisino is about to compete in the final round of a certain programming competition.
In this contest, there are N problems, numbered 1 through N.
Joisino knows that it takes her T_i seconds to solve problem i(1≦i≦N).
Also, there are M kinds of drinks of... |
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While purchasing certain items, a discount of 10% is offered if the quantity purchased is more than 1000.
If the quantity and price per item are input, write a program to calculate the total expenses.
------ Input Format ------
The first line contai... |
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One beautiful July morning a terrible thing happened in Mainframe: a mean virus Megabyte somehow got access to the memory of his not less mean sister Hexadecimal. He loaded there a huge amount of n different natural numbers from 1 to n to obtain total c... |
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You are given $n$ lengths of segments that need to be placed on an infinite axis with coordinates.
The first segment is placed on the axis so that one of its endpoints lies at the point with coordinate $0$. Let's call this endpoint the "start" of the f... |
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Here is a very simple variation of the game backgammon, named “Minimal Backgammon”. The game is played by only one player, using only one of the dice and only one checker (the token used by the player).
The game board is a line of (N + 1) squares label... |
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There is a kangaroo at coordinate 0 on an infinite number line that runs from left to right, at time 0. During the period between time i-1 and time i, the kangaroo can either stay at his position, or perform a jump of length exactly i to the left or to ... |
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The only difference between the easy and the hard versions is constraints.
A subsequence is a string that can be derived from another string by deleting some or no symbols without changing the order of the remaining symbols. Characters to be deleted ar... |
Solve the programming task below in a Python markdown code block.
Input
The input is given from standard input in the following format.
> $H \ W$ $a_{1, 1} \ a_{1, 2} \ \cdots \ a_{1, W}$ $a_{2, 1} \ a_{2, 2} \ \cdots \ a_{2, W}$ $\vdots \ \ \ \ \ \ \ \ \ \ \vdots \ \ \ \ \ \ \ \ \ \ \vdots$ $a_{H, 1} \ a_{H, 2} \ ... |
Solve the programming task below in a Python markdown code block.
Polar bears Menshykov and Uslada from the zoo of St. Petersburg and elephant Horace from the zoo of Kiev got hold of lots of wooden cubes somewhere. They started making cube towers by placing the cubes one on top of the other. They defined multiple towe... |
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