mergesort

问题 Hello I would like you to tell me if the space complexity for those 2 mergesort algorithms is the same. Algo 1: def mergeSort(alist, l, r): if r - l >= 1: mid = l + (r - l)//2 mergeSort(alist, l, mid) mergeSort(alist, mid+1, r) i = l j = mid+1 k = 0 temp_list = [None]*(r-l+1) while i < mid+1 and j < r+1: if alist[i] <= alist[j]: temp_list[k] = alist[i] i=i+1 else: temp_list[k] = alist[j] j=j+1 k=k+1 while i < mid+1: temp_list[k] = alist[i] i=i+1 k=k+1 while j < r+1: temp_list[k] = alist[j] j

问题 I am trying to implement the Merge Sort algorithm with 4-way partition in Java, the problem is that it generates an ArrayIndexOutOfBoundsException error in line 85 of the algorithm. The code is as follows, I based on the 2-way algorithm of Merge Sort (The traditional algorithm): public static void mergeSort3WayRec(Integer[] gArray, int low, int high, Integer[] destArray) { if (high - low < 2) { return; } int mid1 = low + ((high - low) / 4); int mid2 = low + 2 * ((high - low) / 4) + 1; int

问题 i'm brand new to stackoverflow and i need some help with writing a program to mergesort an arraylist of comparables. i have worked on this code for hours to no avail. the program needs to work correctly, because i am doing it for a computer science class, and the very next assignment requires us to test the efficiency of different sorts. here's the code: Merge Method: public static void merge(ArrayList <Comparable> a, int first, int mid, int last){ ArrayList <Comparable> b = new ArrayList();

问题 i'm new in Rcpp and i dont really know Rcpp. but as a personal project, i was trying to run some sort algorithms using some C code that i had, converting them to R with Rcpp. But i'm getting the memory not mapped error, and i dont really understand what i'm doing wrong, so if someone could enlighten me :) The problem happens when a try the following code #include <Rcpp.h> using namespace Rcpp; void intercala(int p, int q, int r, NumericVector v) { int i, j, k; NumericVector w = NumericVector:

问题 I am trying to implement a merge sort and am getting stack level too deep (SystemStackError) error when I run my code. I am not sure what the issue may be. def merge_sort(lists) lists if lists.count == 1 middle = lists[0..(lists.count / 2) - 1 ] left = lists[0..middle.count - 1] right = lists[middle.count..lists.count] x = merge_sort(left) y = merge_sort(right) end merge_sort [1,2,3,4,5,6,7,8] Any help would be great! 回答1: From wikipedia: def mergesort(list) return list if list.size <= 1 mid

问题 void MergeSort(int A[], int n, int B[], int C[]) { if(n > 1) { Copy(A,0,floor(n/2),B,0,floor(n/2)); Copy(A,floor(n/2),n-1,C,0,floor(n/2)-1); MergeSort(B,floor(n/2),B,C); MergeSort(C,floor(n/2),B,C); Merge(A,B,0,floor(n/2),C,0,floor(n/2)-1); } }; void Copy(int A[], int startIndexA, int endIndexA, int B[], int startIndexB, int endIndexB) { while(startIndexA < endIndexA && startIndexB < endIndexB) { B[startIndexB]=A[startIndexA]; startIndexA++; startIndexB++; } }; void Merge(int A[], int B[],int

问题 #include<stdio.h> #include<conio.h> int arr[20]; void main() { int n,i; clrscr(); printf("\n\t\t\t------Merge Sorting------\n\n"); printf("Enter the size of array\n"); scanf("%d",&n); printf("Enter the elements:\n"); for(i=0; i < n; i++) { scanf("%d",&arr[i]); } merge_sort(arr,0,n-1); printf("\n\n\t\t\t-----Merge Sorted Elements-----\n\n"); printf("Sorted array:\t"); for(i=0; i < n; i++) { printf("\t%d",arr[i]); } getch(); } int merge_sort(int arr[],int low,int high) { int mid; if(low < high)

问题 #include<stdio.h> #include<conio.h> int arr[20]; void main() { int n,i; clrscr(); printf("\n\t\t\t------Merge Sorting------\n\n"); printf("Enter the size of array\n"); scanf("%d",&n); printf("Enter the elements:\n"); for(i=0; i < n; i++) { scanf("%d",&arr[i]); } merge_sort(arr,0,n-1); printf("\n\n\t\t\t-----Merge Sorted Elements-----\n\n"); printf("Sorted array:\t"); for(i=0; i < n; i++) { printf("\t%d",arr[i]); } getch(); } int merge_sort(int arr[],int low,int high) { int mid; if(low < high)

问题 Good day SO community, I am a CS student currently performing an experiment combining MergeSort and InsertionSort. It is understood that for a certain threshold, S, InsertionSort will have a quicker execution time than MergeSort. Hence, by merging both sorting algorithms, the total runtime will be optimized. However, after running the experiment many times, using a sample size of 1000, and varying sizes of S, the results of the experiment does not give a definitive answer each time. Here is a

问题 This question already has answers here : Multithreaded quicksort or mergesort (8 answers) Closed 3 years ago . Can someone please give me a link or provide me with java code of a multithreaded merge sort? Preferable one that uses an executor! Thank you very much! 回答1: Here is my version of MergeSort using 2 threads, it can be extended to n threads easily (just split the original array into n sub-arrays). For 10 million numbers, it is faster than its single-thread counterpart by about 25%.