mergesort

Binary Merge sort & Natural Merge sort

由 痴心易碎 提交于 2019-12-10 18:55:36
问题 I know that homework questions are not the most popular on here, but I am at a total loss. I am doing an assignment which requires us to make multiple sorting algorithms. One of them however, is driving me insane. I can find no examples of it online anywhere, and he did not go over it fully in class. We have to make a merge sort that looks like this: void mergeSort(int * a, int s, bool n = false) Where a is the array, s is the size of said array, and n is false for binary merge sort, and true

Python implementation of Mergesort for Linked list doesn't work

由 泪湿孤枕 提交于 2019-12-10 17:49:32
问题 I couldn't find a simple implementation of Merge Sort in Python for Linked Lists anywhere. Here's what I tried: Definition for singly-linked list: class ListNode: def __init__(self, x): self.val = x self.next = None Merge Sort Implementation: def mergeSortLinkedList(A): # Base case length of 0 or 1: if A == None or A.next == None: return A leftHalf, rightHalf = splitTheList(A) mergeSortLinkedList(leftHalf) mergeSortLinkedList(rightHalf) # The above two lines should be modified to the

Using mergesort to sort linked lists

由 我们两清 提交于 2019-12-10 16:37:26
问题 I am currently working on the mergesort algorithm. I have three functions. list_sort_merge, mergelist and splitlist. list_sort_merge calls the other two to split and merge the list. I am having trouble getting this to work correctly. So what happens when I run GDB is that I get through the split function and get each number by itself such as the following example: 427 42.7 4.2.7 Then the mergesort comes along and segfaults me. What happens is the right_list and left_list are not being passed

Sorting of an array using merge sort

由 心已入冬 提交于 2019-12-10 11:50:40
问题 I have implemented for merge sort in c , although the code seems to be correct the code does not give me the sorted array rather returns the same array that is given to it, that means my merge function in not working #include<stdio.h> #include<stdlib.h> void re_sort(int arr[],int size); void merge(int left[],int right[],int arr[],int rightlen,int leftlen); int main(void) { int a[10]; int n; printf("enter the number\n"); scanf("%d",&n); printf("enter the elements\n"); for(int i=0;i<n;i++) {

Mergesort Swaps and Comparisons

由 两盒软妹~` 提交于 2019-12-10 11:09:35
问题 I'm currently working on an analysis project where I'm observing how different algorithms behave when implemented in Java. I got some code which implements a Mergesort algorithm from online, now I need to run this code on an array of 10,000 randomly generated integers (between 1 and 100,000) and record how many swaps and comparisons were made. I'm not exactly sure at which point in the code to increment the variables that count Swaps and Comparisons. What would the expected value be? Since

mergeSort implementation to find number of inversions not working when trying to read from a file

由 倾然丶 夕夏残阳落幕 提交于 2019-12-10 10:59:55
问题 Im trying to do a mergesort implementation to find the number of inversions. . The array seems to return the right results for a small list of numbers that are hard coded, but returns an incorrect number when I read from a file. I guess its something to do with string- integer comparison, but cant figure out what exactly the issue is, . Any insight would be helpful.Here's the (relevant) code- public class ReadFile { public static void main(String args[]){ int count=0; int n[]; int i=0; try{ n

Implementing merge sort function in python class, errors

由 穿精又带淫゛_ 提交于 2019-12-10 00:23:31
问题 So I have a function defined that works great at doing merge sort on a linear array if it is implemented by its lonesome, but if I put it into a class it bugs out. I think it's a great example of what I don't quite understand about how classes work; possibly in regards to namespace management(?). See below: def sort(array): print('Splitting', array) if len(array) > 1: m = len(array)//2 left = array[:m] right = array[m:] sort(left) sort(right) i = 0 j = 0 k = 0 while i < len(left) and j < len

Quicksort slower than Mergesort?

由 痞子三分冷 提交于 2019-12-09 05:06:15
问题 I was working on implementing a quicksort yesterday, and then I ran it, expecting a faster runtime than the Mergesort (which I had also implemented). I ran the two, and while the quicksort was faster for smaller data sets <100 elements (and I did verify that it works), the mergesort became the quicker algorithm fairly quickly. I had been taught that quicksort is almost always "quicker" than mergesort, and I understand that there is some debate on this topic, but I at least expected it to be

Combining MergeSort with Insertion sort to make it more efficient

由 谁都会走 提交于 2019-12-08 22:27:43
问题 So I have a MergeSort algorithm and I want to combine MergeSort with Insertion sort to reduce the overhead of merging, the question is how? I want to sort the segments using insertion sort and then merge. public class mergesorttest{ public static void main(String[]args){ int d[]= {10,2,3,4,5,6,5,4,3,5,6,7,1}; mergeSort(d,0,d.length); for(int x:d) System.out.print(x+" "); System.out.println(); } static void mergeSort(int f[],int lb, int ub){ //termination reached when a segment of size 1

3 partition mergesort

由 本小妞迷上赌 提交于 2019-12-08 20:47:29
My professor assigned my class with implementing mergesort in arrays with 3-part partitioning and merging. That was the exact question from the professor. Problem is I have found no such thing as a 3-way mergesort I only know of a 3-way quicksort so I thought that he probably meant to take an array, split it into 3 parts and then mergesort those 3 parts together and I'm doing this by mergesorting the first 2 parts together and then mergesorting the combined part with the 3rd part. Did I think correctly and did I do the right thing (already implemented but I'm not posting the code since it
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