Скачать или смотреть Solve the Aborted (core dumped) Error in Recursive Merge Sort Implementation in C+ +

Learn how to fix the `malloc(): invalid size (unsorted) Aborted (core dumped)` error in your C+ + recursive merge sort implementation with effective suggestions and modified code examples.
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Fixing the Aborted (core dumped) Error in Recursive Merge Sort

If you're working with recursive merge sort in C+ + and encountering the error message malloc(): invalid size (unsorted) Aborted (core dumped), you’re not alone. This problem typically arises due to improper handling of vector references, leading to issues with memory allocation during sorting. Let's delve into the root causes of this error and how to solve them effectively.

Understanding the Problem

The issue stems from how you are passing your vector<double> to your functions. When you pass by value, you create a temporary copy of the vector rather than working directly with the original. This can lead to unexpected behavior, especially when you're trying to sort the array using recursion.

In your code, the function basic_merge_sort is defined to take a vector by value, which means it's not actually sorting the array you intended to sort. Additionally, passing pointers instead of references can introduce more complexity and lead to the bugs you are experiencing.

Common Issues Identified

Passing by Value: Your basic_merge_sort function is taking the vector as a copy, thus not sorting the original array.

Pointer Misuse: Passing the vector as a pointer does not achieve the intended effect of pass-by-reference.

Confusing End Conditions: The convention of excluding the end index can create confusion and increase the likelihood of errors during recursion.

Step-by-Step Solution

To correct these issues, you should modify your function definitions to use references. Below are the updated code segments along with explanations of the changes made.

Updated Code Example

[[See Video to Reveal this Text or Code Snippet]]

Key Changes and Their Benefits

Passing by Reference: Changing the function signature from vector<double> holder_array to vector<double>& array allows modifications directly to the original vector, ensuring your sorting works on the correct data.

Using Size Explicitly: In the call to mpartition, using array.size() directly ensures the whole vector is being considered, avoiding off-by-one errors.

More Readable Conditions: By implementing explicit checks against middle and end, readability improves, making it clear what boundaries your recursive calls are intended to handle.

Conclusion

Sorting algorithms such as recursive merge sort can be tricky, especially when pointers and references are involved. By ensuring you correctly pass variables, you can avoid potential errors like malloc(): invalid size (unsorted) Aborted (core dumped). Implementing these modifications will help you successfully sort arrays without encountering segmentation faults and other memory-related issues.

If you have further questions or need assistance with your code, feel free to ask!