Hackerrank - Gemstones - Pavol Pidanič

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

Solution
Do intersect of all characters of strings comming as the input.

I created solution in:

Java
JavaScript
Ruby
Scala

All solutions are also available on my GitHub.

Java

import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class GemStones
{
    public static void main(String[] args)
    {
        Scanner scanner = new Scanner(System.in);
        int rocks = scanner.nextInt();

        char[] first = scanner.next().toCharArray();

        Set<Character> result = new HashSet<>();
        for (char c : first)
        {
            result.add(c);
        }

        for (int i = 1; i < rocks; i++)
        {
            char[] composition = scanner.next().toCharArray();
            Set<Character> set = new HashSet<>();
            for (char d : result)
            {
                for (int j = 0; j < composition.length; j++)
                {
                    if(d == composition[j])
                    {
                        set.add(composition[j]);
                    }
                }
            }
            result = set;
        }
        System.out.println(result.size());
        scanner.close();
    }
}

import java.util.HashSet;

import java.util.Scanner;

import java.util.Set;

public class GemStones

{

public static void main(String[] args)

{

Scanner scanner = new Scanner(System.in);

int rocks = scanner.nextInt();

char[] first = scanner.next().toCharArray();

Set<Character> result = new HashSet<>();

for (char c : first)

{

result.add(c);

}

for (int i = 1; i < rocks; i++)

{

char[] composition = scanner.next().toCharArray();

Set<Character> set = new HashSet<>();

for (char d : result)

{

for (int j = 0; j < composition.length; j++)

{

if(d == composition[j])

{

set.add(composition[j]);

}

result = set;

}

System.out.println(result.size());

scanner.close();

}

JavaScript

function processData(input) {
    var lines = input.split('\n');
    var first = lines[1].split('');
    for(var i = 2; i < lines.length; i++) {
        first = intersect(first, lines[i].split(''));
    }
    console.log(first.length)
}

function intersect(arr1, arr2) {
    var unique1 = arr1.distinct();
    var unique2 = arr2.distinct();
    return unique1.distinct().filter(function(s) {
        return unique2.distinct().indexOf(s) !== -1
    });
}

Array.prototype.distinct = function() {
    var hash = {};
    var a = [];
    for(var i = 0; i < this.length; i++) {
        if(hash.hasOwnProperty(this[i])) {
            continue;
        }
        hash[this[i]] = true;
        a.push(this[i]);
    }
    return a;
};

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');

var first = lines[1].split('');

for(var i = 2; i < lines.length; i++) {

first = intersect(first, lines[i].split(''));

}

console.log(first.length)

}

function intersect(arr1, arr2) {

var unique1 = arr1.distinct();

var unique2 = arr2.distinct();

return unique1.distinct().filter(function(s) {

return unique2.distinct().indexOf(s) !== -1

});

}

Array.prototype.distinct = function() {

var hash = {};

var a = [];

for(var i = 0; i < this.length; i++) {

if(hash.hasOwnProperty(this[i])) {

continue;

}

hash[this[i]] = true;

a.push(this[i]);

}

return a;

};

process.stdin.resume();

process.stdin.setEncoding("ascii");

_input = "";

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

_input += input;

});

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

processData(_input);

});

Ruby

string_count = gets.to_i
first = gets.chars.uniq
(string_count - 1).times do
  s = gets.chars.uniq
  first = first & s
end
puts first.length

string_count = gets.to_i

first = gets.chars.uniq

(string_count - 1).times do

s = gets.chars.uniq

first = first & s

end

puts first.length

Scala

import scala.io.Source

object Gemstones extends App {
  val strings = Source.stdin.getLines().drop(1).toList

  val first = strings(0)
  val gemstones = strings.drop(1).foldLeft(first)(_ intersect _)
  println(gemstones.size)
}

import scala.io.Source

object Gemstones extends App {

val strings = Source.stdin.getLines().drop(1).toList

val first = strings(0)

val gemstones = strings.drop(1).foldLeft(first)(_ intersect _)

println(gemstones.size)

}

Pavol Pidanič

I can count to 1023 with 10 fingers

Hackerrank – Gemstones