quicksort

问题 Algorithms like Timsort, Quicksort & Mergesort dominate the " real world " sorting methods. The case for these comparison sorts is quite practical — they've been shown to be the most performant, stable, multipurpose sorting algorithms in a wide variety of environments. However, it seems like nearly everything that we would sort on a computer are countable / partially ordered. Numbers, characters, strings, even functions are amenable to some meaningful non-comparison sorting method. A

问题 If anyone can give some input on my logic, I would very much appreciate it. Which method runs faster for an array with all keys identical, selection sort or insertion sort? I think that this would be similar to when the array is already sorted, so that insertion sort will be linear, and the selection sort quadratic. Which method runs faster for an array in reverse order, selection sort or insertion sort? I think that they would run similarly, since the values at every position will have to be

问题 If anyone can give some input on my logic, I would very much appreciate it. Which method runs faster for an array with all keys identical, selection sort or insertion sort? I think that this would be similar to when the array is already sorted, so that insertion sort will be linear, and the selection sort quadratic. Which method runs faster for an array in reverse order, selection sort or insertion sort? I think that they would run similarly, since the values at every position will have to be

问题 I'm writing a program that will read a text file containing 5,163 names. (text file can be seen here) Then I want to store the names into a list called 'names', afterwards, I sort the list based on how many letters the name contains, shorter names are at the start of the list and the longer ones are at the end. I used quicksort to sort the list, but when I run it, it shows this error: C:\Python27\python.exe C:/Users/Lenovo/Desktop/Anagrams/Main.py Traceback (most recent call last): File "C:

问题 here is the of quick sort algorithm from the MITOcw(Introduction To Algorithms ) lecture QUICKSORT(A,p,q) if(p < q) then r = PARTITION(A,p,q) QUICKSORT(A,p,r-1) QUICKSORT(A,r+1,q) PARTITION(A,p,q) x = A[p] i=p for j = p+1 to q if A[j] <= x then i = i+1 swap A[i] with A[j] swap A[p] with A[i] return i and here its C++ implementation on an integer array #include <iostream> using namespace std; void quickSort(int *,int,int); int partition(int *, int,int); int main() { int A[10]={6,10,13,5,8,3,2

问题 I am working on analysis of sorting algorithms by plotting graphs in MATLAB. Below is my quick sort code. When I run it it is giving this error: Maximum recursion limit of 500 reached. Use set(0,'RecursionLimit', N) to change the limit. Be aware that exceeding your available stack space can crash MATLAB and/or your computer. Error in ==> quickSort Why does this error occur? Is there anything wrong in my code? function [ar] = quickSort(ar, low, high) if low < high [ar, q] = parti(ar, low, high

问题 I've been trying to learn prolog and I want to use the second element of a list as the pivot of a quicksort. I thought using [Head | [Pivot | Tail] ] as the input in the method would work, but then I was not sure where I could place "Head", the first element. like this: qsort([],[]):- !. qsort([Head|[Pivot|Tail]],Sorted):- split(Pivot,[Head|Tail],Less,Greater), qsort(Less,SortedLess), qsort(Greater,SortedGreater), append(SortedLess,[Pivot|SortedGreater],Sorted). split(_,[],[],[]). split(Pivot

问题 I'm curious to know has my implementation of non recursive QuickSort algorithm some drawbacks or hidden rocks. What should be modified in order to optimize it? And what problems could happen when comparing two objects in the way I do it? public class QuickSort <T extends Number> { private Integer first, last, boundLo, boundHi, pivot; Integer temp[] = {0, 0}; public void sort(NewArrayList<T> vect) { Deque<Integer[]> stack = new ArrayDeque<Integer[]>(); first = 0; last = vect.size() - 1; stack

问题 Attempting to learn from doing an implementation of Quicksort, I cannot find out why it's not sorting properly. Using this sequence: 6, 7, 12, 5, 9, 8, 65, 3 It returns this: 3, 5, 7, 8, 9, 65, 12, 6 It seems to sort somewhat, but not all. What have I missed? Here's my code: static void Main(string[] args) { QuickSort qs = new QuickSort(); int[] arr = new int[] { 6, 7, 12, 5, 9, 8, 65, 3 }; foreach (int l in arr) { Console.Write(l + ", "); } int left = 0; int right = arr.Count() - 1; int[]

问题 I have got this seemingly trivial parallel quicksort implementation, the code is as follows: import System.Random import Control.Parallel import Data.List quicksort :: Ord a => [a] -> [a] quicksort xs = pQuicksort 16 xs -- 16 is the number of sparks used to sort -- pQuicksort, parallelQuicksort -- As long as n > 0 evaluates the lower and upper part of the list in parallel, -- when we have recursed deep enough, n==0, this turns into a serial quicksort. pQuicksort :: Ord a => Int -> [a] -> [a]