{"id":34048,"date":"2024-11-01T09:23:33","date_gmt":"2024-11-01T09:23:33","guid":{"rendered":"http:\/\/atmokpo.com\/w\/?p=34048"},"modified":"2024-11-01T10:53:51","modified_gmt":"2024-11-01T10:53:51","slug":"c-coding-test-course-exploring-debugging-use-cases","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/34048\/","title":{"rendered":"C# Coding Test Course, Exploring Debugging Use Cases"},"content":{"rendered":"

<\/p>\n

Hello! In this article, we will solve coding test problems using C# and explore the importance and application of debugging. We will examine how debugging skills can be helpful through specific cases while solving actual problems.<\/p>\n

Problem Description<\/h2>\n
\n

Problem: Longest Palindromic Substring<\/h3>\n

Create a function that returns the longest palindromic substring from a given string. The length of the string can be up to 1000.<\/p>\n

Example input:<\/p>\n

\n\"babad\"<\/code><\/pre>\n
Example output:<\/p>\n
\n\"bab\" or \"aba\"<\/code><\/pre>\n<\/div>\n
Problem Solving Process<\/h2>\n
Now, we will look at the approach to solve this problem step by step.<\/p>\n
Step 1: Understanding the Problem<\/h3>\n
The key point of the problem is to check for palindromes in the given string. A palindrome is a string that reads the same forwards and backwards. For example, “racecar” is such an example. We need to generate all possible substrings from the given string and check each substring to see if it is a palindrome.<\/p>\n
Step 2: Algorithm Design<\/h3>\n
To find the longest palindromic substring, we designed the following algorithm:<\/p>\n
    \n
  1. Generate all substrings of the given string.<\/li>\n
  2. Check if each substring is a palindrome.<\/li>\n
  3. If it is a palindrome, compare the length of that substring and keep the longest one.<\/li>\n<\/ol>\n
    Step 3: C# Code Implementation<\/h3>\n
    Now, let’s implement the C# code according to each step.<\/p>\n
    \nusing System;\n\npublic class LongestPalindromicSubstring\n{\n    public string GetLongestPalindrome(string s)\n    {\n        if (string.IsNullOrEmpty(s)) return \"\";\n\n        string longestPalindrome = \"\";\n\n        for (int i = 0; i < s.Length; i++)\n        {\n            \/\/ Check for odd-length palindromes\n            string oddPalindrome = ExpandFromCenter(s, i, i);\n            if (oddPalindrome.Length > longestPalindrome.Length)\n            {\n                longestPalindrome = oddPalindrome;\n            }\n\n            \/\/ Check for even-length palindromes\n            string evenPalindrome = ExpandFromCenter(s, i, i + 1);\n            if (evenPalindrome.Length > longestPalindrome.Length)\n            {\n                longestPalindrome = evenPalindrome;\n            }\n        }\n\n        return longestPalindrome;\n    }\n\n    private string ExpandFromCenter(string s, int left, int right)\n    {\n        while (left >= 0 && right < s.Length && s[left] == s[right])\n        {\n            left--;\n            right++;\n        }\n        return s.Substring(left + 1, right - left - 1);\n    }\n}\n<\/code><\/pre>\n
    Step 4: Debugging and Testing<\/h3>\n
    Now it’s time to test the implemented code and debug for any errors.<\/p>\n
      \n
    1. After running the code, input various cases to check if the results match the expectations.<\/li>\n
    2. In particular, test complex strings that include whitespace characters, numbers, and special characters to ensure palindromic checking works well.<\/li>\n<\/ol>\n
      Example Test Cases<\/h4>\n
      \nLongestPalindromicSubstring lps = new LongestPalindromicSubstring();\nConsole.WriteLine(lps.GetLongestPalindrome(\"babad\")); \/\/ bab or aba\nConsole.WriteLine(lps.GetLongestPalindrome(\"cbbd\")); \/\/ bb\nConsole.WriteLine(lps.GetLongestPalindrome(\"a\")); \/\/ a\nConsole.WriteLine(lps.GetLongestPalindrome(\"ac\")); \/\/ a\nConsole.WriteLine(lps.GetLongestPalindrome(\"racecar\")); \/\/ racecar\n<\/code><\/pre>\n
      Debugging Tips<\/h3>\n
      When debugging, keep the following points in mind:<\/p>\n