Caesar Cipher 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 ProblemCaesar 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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