Hackerrank - Angry Professor

Hackerrank – Popis problému

Celý popis zadania sa nacháza – Hackerrank.

Riešenie

Spočítaj všetkých študentov, ktorí prišli pred začatím prednášky (ich čas príchodu je menší alebo rovný 0). Pre výsledok stačí skontrolovať, či je počet študentov menší ako hranica pre zrušenie prednášky.

Vytvoril som riešenie v týchto programovacích jazykoch:

Scala
Java
JavaScript
Ruby

Všetky riešenia sú dostupné aj na mojom GitHub profile.

Java

import java.util.Scanner;

public class AngryProfessor
{
    public static void main(String[] args)
    {
        Scanner stdin = new Scanner(System.in);
        int tests = Integer.parseInt(stdin.nextLine());
        for (int i = 0; i < tests; i++)
        {
            String[] inputs = stdin.nextLine().split(" ");
            int students = Integer.parseInt(inputs[0]);
            int classCancelation = Integer.parseInt(inputs[1]);
            String[] arrivals = stdin.nextLine().split(" ");
            if(classCancelation > studentsBeforeClass(arrivals))
            {
                System.out.println("YES");
            }
            else
            {
                System.out.println("NO");
            }
        }
        stdin.close();
    }

    private static int studentsBeforeClass(String[] arrivals) {
		int result = 0;
		for(int i = 0; i < arrivals.length; i++)
		{
		    if(Integer.parseInt(arrivals[i]) <= 0)
		    {
		        result++;
		    }
		}
		return result;
	}
}

import java.util.Scanner;

public class AngryProfessor

{

public static void main(String[] args)

{

Scanner stdin = new Scanner(System.in);

int tests = Integer.parseInt(stdin.nextLine());

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

{

String[] inputs = stdin.nextLine().split(" ");

int students = Integer.parseInt(inputs[0]);

int classCancelation = Integer.parseInt(inputs[1]);

String[] arrivals = stdin.nextLine().split(" ");

if(classCancelation > studentsBeforeClass(arrivals))

{

System.out.println("YES");

}

else

{

System.out.println("NO");

}

stdin.close();

}

private static int studentsBeforeClass(String[] arrivals) {

int result = 0;

for(int i = 0; i < arrivals.length; i++)

{

if(Integer.parseInt(arrivals[i]) <= 0)

{

result++;

}

return result;

}

JavaScript

'use strict';

const processData = input => {
    const lines = input.split('\n');
    const tests = parseInt(lines[0]);
    let actualLine = 1;
    for(let i = 0; i < tests; i++) {
        const studentsAndCancelation = lines[actualLine++].split(' ').map(i => parseInt(i));
        const cancelation = studentsAndCancelation[1];
        const arrivals = lines[actualLine++].split(' ').map(i => parseInt(i));
        const beforeClass = studentsBeforeClass(arrivals);
        const canceled = cancelation > beforeClass ? "YES" : "NO";
        console.log(canceled);
    }
};

const studentsBeforeClass = (arrivals) => {
    let result = 0;
    for(let i = 0; i < arrivals.length; i++) {
        if(arrivals[i] <= 0) {
            result++;
        }
    }
    return result;
};

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 => {

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

const tests = parseInt(lines[0]);

let actualLine = 1;

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

const studentsAndCancelation = lines[actualLine++].split(' ').map(i => parseInt(i));

const cancelation = studentsAndCancelation[1];

const arrivals = lines[actualLine++].split(' ').map(i => parseInt(i));

const beforeClass = studentsBeforeClass(arrivals);

const canceled = cancelation > beforeClass ? "YES" : "NO";

console.log(canceled);

}

};

const studentsBeforeClass = (arrivals) => {

let result = 0;

for(let i = 0; i < arrivals.length; i++) {

if(arrivals[i] <= 0) {

result++;

}

return result;

};

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 AngryProfessor extends App {
  val lines = Source.stdin.getLines().drop(1)
  val inputs = lines.grouped(2).map(_.toList)
  inputs.foreach {
    input => {
      val studentsAndCancelation = input(0).split("\\s+").map(_.toInt)
      val students = studentsAndCancelation(0)
      val cancelation = studentsAndCancelation(1)
      val arrivals = input(1).split("\\s+").map(_.toInt)
      val cancelled = if(cancelation > studentsBeforeClass(arrivals)) "YES" else "NO"
      println(cancelled)
    }
  }

  def studentsBeforeClass(arrivals: Array[Int]): Int = {
    arrivals.count(_ <= 0)
  }
}

import scala.io.Source

object AngryProfessor extends App {

val lines = Source.stdin.getLines().drop(1)

val inputs = lines.grouped(2).map(_.toList)

inputs.foreach {

input => {

val studentsAndCancelation = input(0).split("\\s+").map(_.toInt)

val students = studentsAndCancelation(0)

val cancelation = studentsAndCancelation(1)

val arrivals = input(1).split("\\s+").map(_.toInt)

val cancelled = if(cancelation > studentsBeforeClass(arrivals)) "YES" else "NO"

println(cancelled)

}

def studentsBeforeClass(arrivals: Array[Int]): Int = {

arrivals.count(_ <= 0)

}

Ruby

def before_class(arrivals)
  result = 0
  arrivals.each do |item|
    result += 1 if item <= 0
  end
  return result
end

tests = gets.to_i
tests.times do |i|
  (students, cancelation) = gets.split(" ").map {|i| i.to_i}
  arrivals = gets.split(" ").map {|i| i.to_i}
  before = before_class(arrivals)
  if(cancelation > before)
    puts "YES"
  else
    puts "NO"
  end
end

def before_class(arrivals)

result = 0

arrivals.each do |item|

result += 1 if item <= 0

end

return result

end

tests = gets.to_i

tests.times do |i|

(students, cancelation) = gets.split(" ").map {|i| i.to_i}

arrivals = gets.split(" ").map {|i| i.to_i}

before = before_class(arrivals)

if(cancelation > before)

puts "YES"

else

puts "NO"

end

Pavol Pidanič

Dokážem na 10 prstoch napočítať do 1023

Hackerrank – Angry Professor