Hackerrank - Halloween Party

Problem Statement
A description of the problem can be found on Hackerrank.

Solution
Calculate chocolate pieces as:

$horizontal = slices / 2$

$vertical = slices - horizontal$

$pieces = horizontal * vertical$

I created solution in:

Java
JavaScript
Scala
Ruby

All solutions are also available on my GitHub.

Java

import java.util.*;

public class HalloweenParty {

    public static void main(String[] args) {
        Scanner stdin = new Scanner(System.in);
        int tests = stdin.nextInt();
        for(int i = 0; i < tests; i++) {
            long k = stdin.nextLong();
            long horizontal = k / 2;
            long vertical = k - horizontal;
            System.out.println(vertical * horizontal);
        }
        stdin.close();
    }
}

import java.util.*;

public class HalloweenParty {

public static void main(String[] args) {

Scanner stdin = new Scanner(System.in);

int tests = stdin.nextInt();

for(int i = 0; i < tests; i++) {

long k = stdin.nextLong();

long horizontal = k / 2;

long vertical = k - horizontal;

System.out.println(vertical * horizontal);

}

stdin.close();

}

JavaScript

'use strict';

const processData = input => {
    let lines = input.split("\n");
    let slices = lines.map(i => parseInt(i));
    const pieces = k => {
        let horizontal = parseInt(k / 2);
        let vertical = k - horizontal;
        return vertical * horizontal;
    };
    for(let i = 1; i < slices.length; i++) {
        console.log(pieces(slices[i]));
    }
};

process.stdin.resume();
process.stdin.setEncoding("ascii");

var _input = "";
process.stdin.on("data", input => _input += input);
process.stdin.on("end", () => processData(_input));

'use strict';

const processData = input => {

let lines = input.split("\n");

let slices = lines.map(i => parseInt(i));

const pieces = k => {

let horizontal = parseInt(k / 2);

let vertical = k - horizontal;

return vertical * horizontal;

};

for(let i = 1; i < slices.length; i++) {

console.log(pieces(slices[i]));

}

};

process.stdin.resume();

process.stdin.setEncoding("ascii");

var _input = "";

process.stdin.on("data", input => _input += input);

process.stdin.on("end", () => processData(_input));

Scala

import scala.io.Source

object HalloweenParty extends App {
  val lines = Source.stdin.getLines()
  val slices = lines.drop(1).map(_.toLong)
  val result = slices.map(pieces)
  println(result.mkString("\n"))

  def pieces(k: Long): Long = {
    val horizontal = k / 2
    val vertical = k - horizontal
    vertical * horizontal
  }
}

import scala.io.Source

object HalloweenParty extends App {

val lines = Source.stdin.getLines()

val slices = lines.drop(1).map(_.toLong)

val result = slices.map(pieces)

println(result.mkString("\n"))

def pieces(k: Long): Long = {

val horizontal = k / 2

val vertical = k - horizontal

vertical * horizontal

}

Ruby

test_cases = gets.chomp.to_i
test_cases.times do |test|
  slices = gets.chomp.to_i
  horizontal_slices = slices / 2
  vertical_slices = slices - horizontal_slices
  puts vertical_slices * horizontal_slices
end

test_cases = gets.chomp.to_i

test_cases.times do |test|

slices = gets.chomp.to_i

horizontal_slices = slices / 2

vertical_slices = slices - horizontal_slices

puts vertical_slices * horizontal_slices

end

Pavol Pidanič

I can count to 1023 with 10 fingers

Hackerrank – Halloween Party