Making Anagrams in Algorithm | HackerRank Programming Solutions | HackerRank Problem Solving Solutions in Java [💯Correct]

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Introduction To Algorithm

The word Algorithm means “a process or set of rules to be followed in calculations or other problem-solving operations”. Therefore Algorithm refers to a set of rules/instructions that step-by-step define how a work is to be executed upon in order to get the expected results. 

Advantages of Algorithms:

  • It is easy to understand.
  • Algorithm is a step-wise representation of a solution to a given problem.
  • In Algorithm the problem is broken down into smaller pieces or steps hence, it is easier for the programmer to convert it into an actual program.

Link for the ProblemMaking Anagrams – Hacker Rank Solution

Making Anagrams– Hacker Rank Solution

Problem:

We consider two strings to be anagrams of each other if the first string’s letters can be rearranged to form the second string. In other words, both strings must contain the same exact letters in the same exact frequency. For example, bacdc and dcbac are anagrams, but bacdc and dcbad are not.

Alice is taking a cryptography class and finding anagrams to be very useful. She decides on an encryption scheme involving two large strings where encryption is dependent on the minimum number of character deletions required to make the two strings anagrams. Can you help her find this number?

Given two strings,  and , that may not be of the same length, determine the minimum number of character deletions required to make  and  anagrams. Any characters can be deleted from either of the strings.

Example.

The only characters that match are the ‘s so we have to remove  from  and  from  for a total of  deletions.

Function Description

Complete the makingAnagrams function in the editor below.

makingAnagrams has the following parameter(s):

  • string s1: a string
  • string s2: a string

Returns

  • int: the minimum number of deletions needed

Input Format

The first line contains a single string, .
The second line contains a single string, .

Constraints

  • It is guaranteed that  and  consist of lowercase English letters, ascii[a-z].

Sample Input

cde
abc

Sample Output

4

Explanation

Delete the following characters from our two strings to turn them into anagrams:

  1. Remove d and e from cde to get c.
  2. Remove a and b from abc to get c.

 characters have to be deleted to make both strings anagram

Making Anagrams – Hacker Rank Solution
import java.util.HashMap;
import java.util.Scanner;

/**
 * @author Techno-RJ
 *
 */
public class MakingAnagrams {
	public static int numberNeeded(String first, String second) {
		HashMap<Character, Integer> hmap = new HashMap<Character, Integer>();
		int length = 0;
		for (int i = 0; i < first.length(); i++) {
			char c = first.charAt(i);
			if (hmap.containsKey(c)) {
				hmap.put(c, hmap.get(c) + 1);
			} else {
				hmap.put(c, 1);
			}
		}

		for (int i = 0; i < second.length(); i++) {
			char c = second.charAt(i);
			if (hmap.containsKey(c) && hmap.get(c) != 0) {
				hmap.put(c, hmap.get(c) - 1);
				length += 2;
			}
		}
		return (first.length() + second.length() - length);
	}

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		String a = in.next();
		String b = in.next();
		in.close();
		System.out.println(numberNeeded(a, b));
	}
}

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