Caesar Cipher in Algorithm | HackerRank Programming Solutions | HackerRank Problem Solving Solutions in Java [💯Correct]

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Algorithm Hackerrank Solution | Hackerrank Java Solution

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In this post, you will find the solution for Caesar Cipher 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 Problem – Caesar Cipher – Hacker Rank Solution 

Caesar Cipher – Hacker Rank Solution

Problem:

Julius Caesar protected his confidential information by encrypting it using a cipher. Caesar’s cipher shifts each letter by a number of letters. If the shift takes you past the end of the alphabet, just rotate back to the front of the alphabet. In the case of a rotation by 3, w, x, y and z would map to z, a, b and c.

Original alphabet:      abcdefghijklmnopqrstuvwxyz
Alphabet rotated +3:    defghijklmnopqrstuvwxyzabc

Example

The alphabet is rotated by , matching the mapping above. The encrypted string is .

Note: The cipher only encrypts letters; symbols, such as -, remain unencrypted.

Function Description

Complete the caesarCipher function in the editor below.

caesarCipher has the following parameter(s):

  • string s: cleartext
  • int k: the alphabet rotation factor

Returns

  • string: the encrypted string

Input Format

The first line contains the integer, , the length of the unencrypted string.
The second line contains the unencrypted string, .
The third line contains , the number of letters to rotate the alphabet by.

Constraints

image 87

s is a valid ASCII string without any spaces.

Sample Input

11
middle-Outz
2

Sample Output

okffng-Qwvb

Explanation

Original alphabet:      abcdefghijklmnopqrstuvwxyz
Alphabet rotated +2:    cdefghijklmnopqrstuvwxyzab

m -> o
i -> k
d -> f
d -> f
l -> n
e -> g
-    -
O -> Q
u -> w
t -> v
z -> b
Caesar Cipher – Hacker Rank Solution
import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        int len = s.nextInt(); s.nextLine();
        String str = s.nextLine();
        int shift = s.nextInt();
        
        char sarr[] = str.toCharArray();
        for (int i=0; i<sarr.length; i++) {
            sarr[i] = cryptIt(sarr[i], shift);
        }
        System.out.println(new String(sarr));
    }
    
    public static char cryptIt(char c, int shift) {
        if (!Character.isAlphabetic(c)) return c;
        char base = 'A';
        if (c >= 'a') base = 'a';
        return (char)(((c - base + shift) % 26) + base);
    }
}

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