Hackerrank - Funny String - Pavol Pidanič

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

Solution
For index i in string s check if all differences are equals:

$|s_{i} - s_{i+1}| - |s_{length(s)-i-2} - s_{length(s)-i-1}|$

I created solution in:

Java
JavaScript
Scala
Ruby

All solutions are also available on my GitHub.

Java

import java.util.Scanner;

public class FunnyString 
{

    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 s = stdin.nextLine();
            if(isFunny(s))
            {
                System.out.println("Funny");
            }
            else
            {
                System.out.println("Not Funny");
            }
            
        }
        stdin.close();
    }
    
    private static boolean isFunny(String s)
    {
        for(int j = 0; j < s.length() - 1; j++)
        {
            if(Math.abs(Character.codePointAt(s, j + 1) - Character.codePointAt(s, j)) !=
                    Math.abs(Character.codePointAt(s, s.length() - j - 2) - Character.codePointAt(s, s.length() - j - 1)))
            {
                return false;
            }
        }
        return true;
    }
}

import java.util.Scanner;

public class FunnyString

{

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 s = stdin.nextLine();

if(isFunny(s))

{

System.out.println("Funny");

}

else

{

System.out.println("Not Funny");

}

stdin.close();

}

private static boolean isFunny(String s)

{

for(int j = 0; j < s.length() - 1; j++)

{

if(Math.abs(Character.codePointAt(s, j + 1) - Character.codePointAt(s, j)) !=

Math.abs(Character.codePointAt(s, s.length() - j - 2) - Character.codePointAt(s, s.length() - j - 1)))

{

return false;

}

return true;

}

JavaScript

function processData(input) {
    var lines = input.split('\n');
    for(var i = 1; i < lines.length; i++) {
        if(isFunny(lines[i])) {
            console.log("Funny");
        } else {
            console.log("Not Funny");
        }
    }
}

function isFunny(s) {
    for(var j = 0; j < s.length - 1; j++) {
        if(Math.abs(s.charCodeAt(j + 1) - s.charCodeAt(j)) !==
            Math.abs(s.charCodeAt(s.length - j - 2) - s.charCodeAt(s.length - j - 1))) {
            return false;
        }
    }
    return true;
}

process.stdin.resume();
process.stdin.setEncoding("ascii");
_input = "";
process.stdin.on("data", function (input) {
    _input += input;
});

process.stdin.on("end", function () {
    processData(_input);
});

function processData(input) {

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

for(var i = 1; i < lines.length; i++) {

if(isFunny(lines[i])) {

console.log("Funny");

} else {

console.log("Not Funny");

}

function isFunny(s) {

for(var j = 0; j < s.length - 1; j++) {

if(Math.abs(s.charCodeAt(j + 1) - s.charCodeAt(j)) !==

Math.abs(s.charCodeAt(s.length - j - 2) - s.charCodeAt(s.length - j - 1))) {

return false;

}

return true;

}

process.stdin.resume();

process.stdin.setEncoding("ascii");

_input = "";

process.stdin.on("data", function (input) {

_input += input;

});

process.stdin.on("end", function () {

processData(_input);

});

Scala

import scala.io.Source

object FunnyString extends App {
  val lines = Source.stdin.getLines().drop(1)
  val funnies = lines.map(funny).map(toText)
  println(funnies.mkString("\n"))

  def funny(s: String): Boolean = {
    val l = s.length
    s.indices.take(l - 1).forall(i =>
      (s.charAt(i) - s.charAt(i + 1)).abs == (s.charAt(l - i - 2) - s.charAt(l - i - 1)).abs)
  }

  def toText(b: Boolean): String = {
    if(b) "Funny" else "Not Funny"
  }
}

import scala.io.Source

object FunnyString extends App {

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

val funnies = lines.map(funny).map(toText)

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

def funny(s: String): Boolean = {

val l = s.length

s.indices.take(l - 1).forall(i =>

(s.charAt(i) - s.charAt(i + 1)).abs == (s.charAt(l - i - 2) - s.charAt(l - i - 1)).abs)

}

def toText(b: Boolean): String = {

if(b) "Funny" else "Not Funny"

}

Ruby

def funny?(s)
  for i in 0...s.length() - 1
    return false if((s[i].ord - s[i + 1].ord).abs != (s[s.length() - i - 2].ord - s[s.length() - i - 1].ord).abs)
  end
  return true
end

tests = gets.to_i
tests.times do
  s = gets.to_s.strip
  if funny?(s)
    puts "Funny"
  else
    puts "Not Funny"
  end
end

def funny?(s)

for i in 0...s.length() - 1

return false if((s[i].ord - s[i + 1].ord).abs != (s[s.length() - i - 2].ord - s[s.length() - i - 1].ord).abs)

end

return true

end

tests = gets.to_i

tests.times do

s = gets.to_s.strip

if funny?(s)

puts "Funny"

else

puts "Not Funny"

end

Pavol Pidanič

I can count to 1023 with 10 fingers

Hackerrank – Funny String