quicksort Questions
5
Solved
If I had an array of integers with 1000 elements, what would be the fastest way to find a specific element's index? Would it be best to first QuickSort it and then use BinarySearch or just to use p...
Selfhypnosis asked 7/5, 2016 at 14:13
2
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I'm a programming student and rather than post the whole assignment I'll just ask for help solving what I've tried for hours now to understand. I'm tasked with sorting an array of strings using the...
2
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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 o...
Sextant asked 3/8, 2014 at 14:14
4
I've been testing the time complexity of different sorting algorithms for different number sequences and it was all going well until i got quicksort's (with pivot in the middle) results for sequenc...
Teilo asked 5/4, 2016 at 20:35
2
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It seems quite straightforward to implement quicksort using bi-directional iterators with O(NlgN) time and O(lgN) space. So, what is the particular reason that std::sort() requires random-access it...
6
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The worst-case running time of insertion on a red-black tree is O(lg n) and if I perform a in-order walk on the tree, I essentially visit each node, so the total worst-case runtime to print the sor...
Strain asked 17/7, 2010 at 6:44
2
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I have a two dimensional array and want to sort both rows depending on the order of the elements in the first row:
i start with:
row1: { 4, 3, 1, 5, 0}
row2: { 7, 8, 9, 1, 2}
and the result sho...
2
Solved
I am new at Haskell. Why am I getting the error message
(Couldn't match type '[]' with 'IO' — Haskell) in folowing code.
In main I only need time of algorithm running without the result.
Only...
Teary asked 17/7, 2015 at 15:32
2
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Am I missing something? The source is short, ready to run and commented for better understanding. I need to know what I'm doing wrong.
package com.company;
import java.io.BufferedReader;
import j...
2
I've seen in a few places the following code recommended to add to numbers and divide by 2, particularly in the context of finding a middle index in an array to be quicksorted.
int middle = ( low ...
3
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I have a task to write quicksort (on only posivite numbers) algorythm in Java (I can't use any imports but Scanner) but without recursion and without stack.
I have two question about it :
I do u...
2
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I am reading Robert Sedgewick's book Algorithms 4th edition, and he has the following exercise question: What is the expected number of subarrays of size 0, 1 and 2 when quicksort is used to sort a...
Ehlers asked 17/5, 2015 at 3:30
4
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Evidently LINQ's "OrderBy" had originally been specified as unstable, but by the time of Orca it was specified as stable. Not all documentation has been updated accordingly - consider these links:
...
2
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I'm implementing QuickSort in C.
Here's my swap procedure:
void swap(int *x, int *y)
{
*x += (*y);
*y = (*x) - (*y);
*x = (*x) - (*y);
}
And here's my Partition procedure:
int partition(int...
3
Solved
The space complexity of Quicksort is listed as O(logn).
however - Quicksort can process without use of any additional memory:
at each iteration, during the partition process,
the entries are sw...
Tiro asked 20/4, 2015 at 1:53
4
Solved
In Java Arrays.sort() for primitive type uses quick sort. On the other hand Arrays.sort() for objects uses Merge sort. And, same goes for Collection.sort() which also uses Merge sort. Collections s...
6
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I read about quicksort algorithm and I don't understand how to choose pivot element. From tutorials I get example code of quciksort:
public void quicksort(int[] A, int left, int right) {
int piv...
Jointless asked 3/7, 2013 at 7:30
1
I am reading ANSI C by K&R. I came across the qsort program. I want a little help. Suppose I have 9 elements with index 0->8. Please read the comments to see if I am understanding it correct or...
2
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Being the recursion depth the maximum number of successive recursive calls before QuickSort hits it´s base case, and noting that it (recursion depth) is a random variable, since it depends on the c...
1
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I am reading about quicksort, looking at different implementations and I am trying to wrap my head around something.
In this implementation (which of course works), the pivot is chosen as the mid...
1
I created this program for an assignment in which we were required to create an implementation of Quichesort. This is a hybrid sorting algorithm that uses Quicksort until it reaches a certain recur...
1
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 c...
2
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I have been doing my homework which is to compare a bunch of sorting algorithms, and I have came across a strange phenomenon. Things have been as expected: insertionsort winning for something like ...
Springwood asked 3/11, 2014 at 20:56
1
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I'm learning Go, and tried to implement a quicksort, however it doesn't return a complete list. To my understanding of Go it matches with a functioning Ruby implementation I wrote.
My code is:
fu...
5
Handling repeated elements in previous quicksorts
I have found a way to handle repeated elements more efficiently in quicksort and would like to know if anyone has seen this done before.
This me...
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