Merge sort stack overflow

I am trying to write several different sorting algorithms in order to time the differences between them when reading a file of bjd dolls philippines half million integers. For testing purposes, I am only using a few hundred integers, but I am getting a stack overflow error. Also, for testing merge sort stack overflow, I have an output file being created during this run so that I can see if the code is working correctly. Originally, I had 3 nested for loops that I believed were causing the errors and horrible effecienceybut I cleaned those up and I am still having the error.

A stack is a linear data structure in which the insertion of a new element and removal of an existing element takes place at the same end represented as the top of the stack. To implement the stack, it is required to maintain the pointer to the top of the stack , which is the last element to be inserted because we can access the elements only on the top of the stack. This strategy states that the element that is inserted last will come out first. You can take a pile of plates kept on top of each other as a real-life example. The plate which we put last is on the top and since we remove the plate that is at the top, we can say that the plate that was put last comes out first. In order to make manipulations in a stack, there are certain operations provided to us.

Merge sort stack overflow

Ask questions, find answers and collaborate at work with Stack Overflow for Teams. Explore Teams. Connect and share knowledge within a single location that is structured and easy to search. I'm using Linux merge sort sort -m to sort a large group of presorted files. I was assuming that merge sort would be considerably faster than a full sort on the unsorted data but that's not what I'm seeing. For example, if I do a full sort on files containing lines of unsorted data:. The merge sort wall time is actually slower than the full sort! Again, I was expecting the merge sort to be considerably faster since each input file in the data set is presorted and only the merge step remains to be done. There must be a something that I'm missing. Can someone please clarify what I'm doing wrong? Explore Teams Create a free Team.

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Remember Me? Thread: stack overflow in merge sort of linkedlist. How can i solve it? After looking at the code for a few minutes I've realised that the problem is that your code for splitting the list up is not dividing the list evenly in two. All but two of the items go in the first list, and it is this huge unevenness that would eventually lead to stack overflow when there are enough items.

Learn Python practically and Get Certified. Merge Sort is one of the most popular sorting algorithms that is based on the principle of Divide and Conquer Algorithm. Here, a problem is divided into multiple sub-problems. Each sub-problem is solved individually. Finally, sub-problems are combined to form the final solution. Using the Divide and Conquer technique, we divide a problem into subproblems. When the solution to each subproblem is ready, we 'combine' the results from the subproblems to solve the main problem.

Merge sort stack overflow

Following is a typical recursive implementation of Merge Sort. Time complexity: O n log n Auxiliary Space complexity: O n. Iterative Merge Sort: The above function is recursive, so uses function call stack to store intermediate values of l and h.

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When the base case is reached, the function returns its value to the function by whom it is called and memory is de-allocated and the process continues. However, recursion can also be a powerful tool for solving complex problems, particularly those that involve breaking a problem down into smaller subproblems. Release build default settings should at least do some optimisation. Understanding this mapping of array indexes to tree positions is critical to understanding how the Heap Data Structure works and how it is used to implement Heap Sort. Did you find this article helpful? Recursive condition. Just for you to know, i posted this problem in 3 other forums and none of them had any idea what to do with it. You can post them onto pastebin. Diagram of factorial Recursion function for user input 5. Replies: 6 Last Post: , PM. Note: As a prerequisite, you must know about a complete binary tree and heap data structure.

Merge sort is defined as a sorting algorithm that works by dividing an array into smaller subarrays, sorting each subarray, and then merging the sorted subarrays back together to form the final sorted array. In simple terms, we can say that the process of merge sort is to divide the array into two halves, sort each half, and then merge the sorted halves back together.

Edit Preview. Sonal Tuteja. Last edited by iMalc; at PM. Recursion function. So, your 5 minutes running time just means that you've left the program running on an infinite loop for 5 minutes. To implement the stack, it is required to maintain the pointer to the top of the stack , which is the last element to be inserted because we can access the elements only on the top of the stack. Hi again iMalc, I get stack overlflow for elements, but for the sort is working, i dont mind about stability. In the recursive program, the solution to the base case is provided and the solution to the bigger problem is expressed in terms of smaller problems. So for example, I entered your values that you supplied and did the following: quickSort test, 0, 99 ; Where we can assume that 0 is the first value inside the array and 99 is the last value, this printed out a result. Removing the unused variables might help the debug build work at greater numbers. I got the number because the full file has that many entries in it. Make sure you update those other sites to say what has been solved.