Java encryption decryption HackerRank solution

The encryption decryption problem on HackerRank involves removing spaces from a given text, arranging the characters into a grid based on the square root of the text's length, and then reading the grid column by column to create an encrypted message. The grid dimensions are chosen to minimize the area while ensuring the number of rows is less than or equal to the columns.

In this post, we will demonstrate how our tool, CodeRankGPT, can give you the encryption decryption hackerrank solution in Java, and help you succeed in your HackerRank coding interview.

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Here is the Java encryption decryption HackerRank solution using CodeRankGPT:

Encryption decryption HackerRank solution:

public static String encryption(String s) {
        // Remove spaces from the string
        s = s.replaceAll("\\s", "");
        int length = s.length();

        // Determine grid dimensions
        int floor = (int) Math.floor(Math.sqrt(length));
        int ceil = (int) Math.ceil(Math.sqrt(length));

        // Adjust rows and columns based on calculated dimensions
        int rows = floor;
        int columns = ceil;
        if (rows * columns < length) {
            if (ceil * ceil >= length) {
                rows = ceil;
                columns = ceil;
            } else if (ceil * floor >= length) {
                rows = ceil;
            }
        }

        StringBuilder encrypted = new StringBuilder();
        // Construct column-wise encryption
        for (int col = 0; col < columns; col++) {
            for (int row = 0; row < rows; row++) {
                int index = row * columns + col;
                if (index < length) {
                    encrypted.append(s.charAt(index));
                }
            }
            if (col < columns - 1) {
                encrypted.append(' ');
            }
        }

        return encrypted.toString();
    }

}

When we use this code, we pass all HackerRank tests:

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