Hackerrank - Bon Appétit - Pavol Pidanič

Hackerrank – Problem Statement

A description of the problem can be found on Hackerrank.

Solution

First find a correct amount of money – (food_sum - index_of_allergic) / 2.
Compare if the correct amount is equals with given amount.

I created solution in:

Scala
Java
JavaScript
Ruby

All solutions are also available on my GitHub.

Java

import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner stdin = new Scanner(System.in);
        int n = stdin.nextInt();
        int k = stdin.nextInt();
        int[] prices = new int[n];
        for(int i = 0; i < n; i++) {
            prices[i] = stdin.nextInt();
        }
        int actual = stdin.nextInt();
        int charged = (Arrays.stream(prices).sum() - prices[k]) / 2;

        if(actual == charged) {
            System.out.println("Bon Appetit");
        } else {
            System.out.println(Math.abs(charged - actual));
        }
        stdin.close();
    }
}

import java.util.*;

public class Solution {

public static void main(String[] args) {

Scanner stdin = new Scanner(System.in);

int n = stdin.nextInt();

int k = stdin.nextInt();

int[] prices = new int[n];

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

prices[i] = stdin.nextInt();

}

int actual = stdin.nextInt();

int charged = (Arrays.stream(prices).sum() - prices[k]) / 2;

if(actual == charged) {

System.out.println("Bon Appetit");

} else {

System.out.println(Math.abs(charged - actual));

}

stdin.close();

}

JavaScript

'use strict';

const _ = require('lodash');

const processData = input => {
    const lines = input.split('\n');
    const [n, k] = lines[0].split(' ');
    const items = lines[1].split(' ').map(i => parseInt(i));
    const actual = parseInt(lines[2]);
    const charged = parseInt((_.sum(items) - items[k]) / 2);
    if(charged === actual) {
        console.log('Bon Appetit');
    } else {
        console.log(Math.abs(charged - actual));
    }
};

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

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

'use strict';

const _ = require('lodash');

const processData = input => {

const lines = input.split('\n');

const [n, k] = lines[0].split(' ');

const items = lines[1].split(' ').map(i => parseInt(i));

const actual = parseInt(lines[2]);

const charged = parseInt((_.sum(items) - items[k]) / 2);

if(charged === actual) {

console.log('Bon Appetit');

} else {

console.log(Math.abs(charged - actual));

}

};

process.stdin.resume();

process.stdin.setEncoding("ascii");

let _input = "";

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

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

Scala

import scala.io.Source

object BonAppetit extends App {
  val lines = Source.stdin.getLines().toList
  val k = lines.head.split(" ")(1).toInt
  val items = lines(1).split(" ").map(_.toInt)
  val actual = lines(2).toInt
  val charged = (items.sum - items(k)) / 2

  println(if(charged == actual) "Bon Appetit" else charged - actual)
}

import scala.io.Source

object BonAppetit extends App {

val lines = Source.stdin.getLines().toList

val k = lines.head.split(" ")(1).toInt

val items = lines(1).split(" ").map(_.toInt)

val actual = lines(2).toInt

val charged = (items.sum - items(k)) / 2

println(if(charged == actual) "Bon Appetit" else charged - actual)

}

Ruby

(n, k) = gets.strip.split.map(&:to_i)
items = gets.strip.split.map(&:to_i)
actual = gets.strip.to_i

sum = 0
items.each{ |i| sum += i}
charged = (sum - items[k]) / 2

if(charged == actual)
  puts "Bon Appetit"
else
  puts (actual - charged)
end

(n, k) = gets.strip.split.map(&:to_i)

items = gets.strip.split.map(&:to_i)

actual = gets.strip.to_i

sum = 0

items.each{ |i| sum += i}

charged = (sum - items[k]) / 2

if(charged == actual)

puts "Bon Appetit"

else

puts (actual - charged)

end

Pavol Pidanič

I can count to 1023 with 10 fingers

Hackerrank – Bon Appétit