C# Coding Test Course, Let's Try DDR

In this session, we will solve algorithm problems for employment using C#. The topic will be based on a popular dance rhythm game called DDR (Dance Dance Revolution). We will implement the input patterns required in the DDR game in code and write an algorithm to process those patterns.

Problem Description

You are a developer analyzing the patterns of the DDR game. In DDR, input is received for each direction panel (up, down, left, right). The input consists of a series of directional key patterns given at specific time intervals. Each direction can be represented as follows:

U: Up
D: Down
L: Left
R: Right

Based on the given input pattern, you need to determine how accurately the user has inputted that pattern. We will check the length of the pattern and whether it was input correctly within a certain time frame to assign a score.

Input Format

The first line contains the length of the pattern N. (1 ≤ N ≤ 100)
The second line contains the pattern made up of N characters.
The third line contains the user’s input pattern X.

Output Format

The accuracy score indicating how closely the user’s input matches the pattern will be output. The score is calculated as follows:

Scores are calculated only when the length of the pattern and the user’s input length are the same.
10 points are awarded for each matching character.
If there is a mismatch, the score will be lost at that index, and the penalty is 5 points.
The final score is output.

Example Input

5
UDLRU
UDLRD

Example Output

Problem Solving Process

Now, let’s take a step-by-step look at how to write the code to solve this problem. First, we will outline the required functionality.

Declare variables to store the length of the pattern (N) and the input pattern.
Store the pattern in an array or list of length N.
Store the user’s input pattern in an array or list.
Compare the input pattern with the existing pattern to check for matches and calculate scores.
Output the final score.

Writing C# Code

Now, we will write the C# code according to the above requirements.


using System;

class DDR
{
    static void Main()
    {
        // Get the length of the pattern N
        int N = int.Parse(Console.ReadLine());
        
        // Declare string arrays to store the DDR pattern and user input pattern
        string pattern = Console.ReadLine();
        string userInput = Console.ReadLine();
        
        // Initialize score variable
        int score = 0;
        
        // Check if the input length is the same as the pattern
        if (N != userInput.Length)
        {
            Console.WriteLine("The input length does not match the pattern length.");
            return;
        }

        // Calculate scores by comparing the pattern and user input
        for (int i = 0; i < N; i++)
        {
            if (pattern[i] == userInput[i])
            {
                score += 10; // Award 10 points for each match
            }
            else
            {
                score -= 5; // Deduct 5 points for each mismatch
            }
        }
        
        // Output the final score
        Console.WriteLine(score);
    }
}

The code above is relatively simple, designed to receive the DDR pattern input and compare it with the user input to calculate the score. When executed, it prompts the user for the pattern and input, calculates the score, and outputs it.

Code Explanation

1. using System;: Declaration to use the basic library of C#.

2. class DDR: Defines a class named DDR.

3. static void Main(): The entry point of the program. All code execution starts here.

4. The user's input is taken using int.Parse(Console.ReadLine()) and stored in an integer variable N.

5. The pattern and user input are both received and stored as strings.

6. The score variable score is initialized.

7. It checks whether the length of the user's input matches the length of the pattern. If not, the program terminates.

8. The logic compares the pattern and awards 10 points for matches and deducts 5 points for mismatches.

9. Finally, it outputs the final score.

Conclusion

In this lecture, we structured an algorithm problem based on the DDR pattern and explored how to solve it using C#. We wrote logic for pattern analysis and score calculation through algorithm problem-solving. I hope this helps improve your current skills in algorithms and coding. Let's continue studying various topics together in the future.

C# Coding Test Course, Let’s Try DDR