Examine the LeetCode configuration file

Oct 13, 2025 by magicalceylontours.com 11 views

Introduction

As a LeetCode user, we often encounter problems where our solutions pass the test cases on the LeetCode website but fail when we run them locally. In this article, we will explore a specific problem, Problem 206, where a correct solution in Go cannot pass the test cases.

Problem 206

Problem 206 is a classic problem in LeetCode, where we need to reverse a singly linked list. The problem statement is as follows:

"Reverse a singly linked list."

Correct Solution

The correct solution for this problem in Go is as follows:

func reverseList(head *ListNode) (ans *ListNode) {
	var previous *ListNode
	current := head

	for current != nil {
		next := current.Next
		current.Next = previous
		previous = current
		current = next
	}

	return previous
}

This solution uses a simple iterative approach to reverse the linked list. It keeps track of the previous node and the current node, and swaps their next pointers to reverse the list.

Issue with the Solution

Despite the correctness of the solution, it fails to pass the test cases when run locally. The issue lies in the way the solution is generated by LeetCode. LeetCode uses a template to generate the solution code, and the template may not be compatible with the solution we provide.

LeetCode Configuration

To troubleshoot the issue, we need to examine the LeetCode configuration file, leetgo.yaml. The configuration file contains various settings that control how LeetCode generates the solution code.

Here is the relevant part of the configuration file:

code:
  lang: go
  filename_template: '{{ .Id | padWithZero 4 }}{{ if .SlugIsMeaningful }}.{{ .Slug }}{{ end }}'
  separate_description_file: true
  modifiers:
    - name: removeUselessComments
  go:
    out_dir: go
    modifiers:
      - name: removeUselessComments
      - name: changeReceiverName
      - name: addNamedReturn
      - name: addMod

In this configuration file, we can see that the language is set to Go, and the filename template is set to a specific format. We also see that there are several modifiers applied to the Go code, including removing useless comments and changing the receiver name.

Debugging the Issue

To debug the issue, we need to identify the specific problem with the solution. We can do this by examining the debug log generated by LeetCode.

Here is the debug log:

Unfortunately, the debug log is empty, which means that we need to rely on other debugging techniques to identify the issue.

Conclusion

In conclusion, the problem with the solution is likely due to the way the solution is generated by LeetCode. The LeetCode configuration file contains various settings that control how the solution code is generated, and these settings may not be compatible with the solution we provide.

To resolve the issue, we need to examine the LeetCode configuration file and modify it to ensure that the solution code is generated correctly. We also need to debug the issue using other techniques, such as examining the debug log and using a debugger.

Recommendations

Based on our analysis, we recommend the following:

Examine the LeetCode configuration file: Review the LeetCode configuration file to ensure that the solution code is generated correctly.
Modify the configuration file: Modify the configuration file to ensure that the solution code is generated correctly.
Debug the issue: Use other debugging techniques, such as examining the debug log and using a debugger, to identify the specific problem with the solution.
Test the solution: Test the solution thoroughly to ensure that it passes all test cases.

Q: What is the problem with the solution?

A: The problem with the solution is that it fails to pass the test cases when run locally. The issue lies in the way the solution is generated by LeetCode.

Q: What is the cause of the issue?

A: The cause of the issue is likely due to the way the solution is generated by LeetCode. The LeetCode configuration file contains various settings that control how the solution code is generated, and these settings may not be compatible with the solution we provide.

Q: How can I resolve the issue?

A: To resolve the issue, you need to examine the LeetCode configuration file and modify it to ensure that the solution code is generated correctly. You also need to debug the issue using other techniques, such as examining the debug log and using a debugger.

Q: What are the common mistakes that can cause this issue?

A: The common mistakes that can cause this issue include:

Incorrect language setting: Make sure that the language setting in the LeetCode configuration file is correct.
Incorrect filename template: Make sure that the filename template in the LeetCode configuration file is correct.
Incorrect modifier settings: Make sure that the modifier settings in the LeetCode configuration file are correct.
Incorrect debug log settings: Make sure that the debug log settings in the LeetCode configuration file are correct.

Q: How can I debug the issue?

A: To debug the issue, you can use the following techniques:

Examine the debug log: Examine the debug log to see if there are any error messages or warnings that can help you identify the issue.
Use a debugger: Use a debugger to step through the code and identify the specific problem with the solution.
Test the solution: Test the solution thoroughly to see if it passes all test cases.

Q: What are the best practices for resolving this issue?

A: The best practices for resolving this issue include:

Examine the LeetCode configuration file: Examine the LeetCode configuration file to ensure that the solution code is generated correctly.
Modify the configuration file: Modify the configuration file to ensure that the solution code is generated correctly.
Debug the issue: Use other debugging techniques, such as examining the debug log and using a debugger, to identify the specific problem with the solution.
Test the solution: Test the solution thoroughly to ensure that it passes all test cases.

Q: Can I get help from LeetCode support?

A: Yes, you can get help from LeetCode support. You can submit a ticket to LeetCode support and they will help you resolve the issue.

Q: How long does it take to resolve the issue?

A: The time it takes to resolve the issue depends on the complexity of the issue and the availability of LeetCode support. In general, it can take anywhere from a few hours to a few days to resolve the issue.

Q: What are the consequences of not resolving the issue?

A: The consequences of not resolving the issue include:

Failed test cases: The solution will fail to pass all test cases.
Incorrect results: The solution will produce incorrect results.
Loss of credibility: The solution will lose credibility and may not be accepted by LeetCode.

By following these best practices and using the techniques outlined above, you can resolve the issue and ensure that your solution passes all test cases.