Super Reduced String in Algorithm | HackerRank Programming Solutions | HackerRank Problem Solving Solutions in Java [💯Correct]

Hello Programmers/Coders, Today we are going to share solutions of Programming problems of HackerRank, Algorithm Solutions of Problem Solving Section in Java. At Each Problem with Successful submission with all Test Cases Passed, you will get an score or marks. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.

In this post, you will find the solution for Super Reduced String in Java-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.

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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 ProblemSuper Reduced String– Hacker Rank Solution

Super Reduced String– Hacker Rank Solution

Problem:

Reduce a string of lowercase characters in range ascii[‘a’..’z’]by doing a series of operations. In each operation, select a pair of adjacent letters that match, and delete them.

Delete as many characters as possible using this method and return the resulting string. If the final string is empty, return Empty String

Example.

image 84

Remove the two ‘b’ characters leaving ‘aa’. Remove the two ‘a’ characters to leave ”. Return ‘Empty String’.

Function Description

Complete the superReducedString function in the editor below.

superReducedString has the following parameter(s):

  • string s: a string to reduce

Returns

  • string: the reduced string or Empty String

Input Format

A single string, .

Constraints

image 83

Sample Input 0

aaabccddd

Sample Output 0

abd

Explanation 0

Perform the following sequence of operations to get the final string:

aaabccddd → abccddd → abddd → abd

Sample Input 1

aa

Sample Output 1

Empty String

Explanation 1

aa → Empty String

Sample Input 2

baab

Sample Output 2

Empty String

Explanation 2

baab → bb → Empty String
Super Reduced String – Hacker Rank Solution
import java.util.Scanner;
import java.util.Stack;

/**
 * @author Techno-RJ
 *
 */
public class SuperReducedString {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		String value = getReducedString(s);
		System.out.println(value == "" ? "Empty String" : value);
		sc.close();
	}

	private static String getReducedString(String s) {
		char[] ch = s.toCharArray();
		Stack<Character> st = new Stack<Character>();
		for (int i = 0; i < ch.length; i++) {
			if (st.empty()) {
				st.push(ch[i]);

			} else if (st.peek() == ch[i]) {
				st.pop();
			} else {
				st.push(ch[i]);

			}
		}
		String str = "";
		while (!st.isEmpty()) {
			str = st.pop() + str;
		}
		return str;
	}

}

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