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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 Problem – Super 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.
![Super Reduced String in Algorithm | HackerRank Programming Solutions | HackerRank Problem Solving Solutions in Java [💯Correct] 2 image 84](https://technorj.com/wp-content/uploads/2021/12/image-84.png)
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
![Super Reduced String in Algorithm | HackerRank Programming Solutions | HackerRank Problem Solving Solutions in Java [💯Correct] 3 image 83](https://technorj.com/wp-content/uploads/2021/12/image-83.png)
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; } }