Possible Duplicate: why is in place merge sort not stable? I wrote a simple implementation that is very similar to normal merge sort (using additional memory) but adds complexity. I don't understand why in place merge sort is not stable. The behavior is the same as merge sort. See the blow implementation: /** class for In plac...
Anyone knows where to find some documentation about Tim Sort using examples and probably pseudocode to describe it? I'm interested in how it works but the docs I've found so far, well, err, are not very pleasant to read ^^. ...
I've read a lot about mergesort recently and I wonder if there is a way to do a mergesort without using at least one additional array. Is it possible? ...
First, let me describe two button-up ways to merge-sort a single linked list: Merge two elements, push that on a stack. Merge the next two elements, pop, merge and push. Merge two elements, push, merge two, pop, merge, pop, merge, push. I hope you got the idea. Merge with the next element, move 2. Merge, move 2. If you arrived at the e...
Do you know of any library that would provide a well-tested concurrent quicksort or mergesort algorithm for Java? We've had issues on a 16-(virtual)-cores Mac where only one core (!) was working using the default Java sorting algo and it was, well, not good to see that very fine machine be completely underused. So we wrote our own (I w...
Are there any resources on how the mergeSort used by Arrays.sort(Object[] a) is implemented? While it is documented quite good, I have a hard time understanding it (especially why the src and dest are are switched when mergeSort() get's recursively called). ...
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 endI...
Does anyone know of a clean C/C++ implementation of timsort? The Python sources contain a description and code for the original timsort, but it is understandably full of python-specific calls. Thanks! ...
What is the fastest way to sort the values in a smooth 2D array? The input is a small filtered image: about 60 by 80 pixels single channel single or double precision float row major storage, sequential in memory values have mixed sign piecewise "smooth", with regions on the order of 10 pixels wide Output is a flat (about 4800 value)...
I know the question is not too specific. All I want is someone to tell me how to convert a normal merge sort into an in-place merge sort (or a merge sort with constant extra space overhead). All I can find (on the net) is pages saying "it is too complex" or "out of scope of this text". The only known ways to merge in-place (with...
Does merge sort work by; taking a list of values splitting it in to two take the first element of each list, the lowest value one goes in to a new list(and i guess removed from the original). comare the next two numbers - do this until one list is empty, then place the rest of the other list at the end ofthe nw list? Also, what are ...
vector<int>& mergesort(vector<int> &a) { if (a.size() == 1) return a; int middle = a.size() / 2; vector<int>::const_iterator first = a.begin(); vector<int>::const_iterator mid = a.begin() + (middle - 1); vector<int>::const_iterator last = a.end(); vector<int> ll(first, mid); vector<int> rr(mid, last); vec...
Hi, If we are looking for line intersections (horizontal and vertical lines only) and we have n lines with half of them vertical and no intersections then Sorting the list of line end points on y value will take N log N using mergesort Each insert delete and search of our data structue (assuming its a b-tree) will be < log n so the...
Explain which algorithm you would use to implement a function that takes an array of integers and returns the maximum integer in the collection, assuming that the length of the array is less than 1000. Would you use Bubble Sort or Merge Sort and Why? Also, what happens to the above algorithm choice, if the array length is greater than 1...
I am currently working on a project involving external merge-sort using replacement-selection and k-way merge. I have implemented the project in C++[runs on linux]. Its very simple and right now deals with only fixed sized records. For reading & writing I use (i/o)fstream classes. After executing the program for few iterations, I notic...
merge1(int low, int high, int S[], U[]) { int k = (high - low + 1)/2 for q (from low to high) U[q] = S[q] int j = low int p = low int i = low + k while (j <= low + k - 1) and (i <= high) do { if ( U[j] <= U[i] ) { S[p] := U[j] j := j+1 } else ...
Hi I have found this code in the internet and it was for arrays ,I want to change it for doubly linked list(instead of index we should use pointer) would you please help me that how can i change merge method(I have changed sort method by myself) also this is not my home work ,I love working with linked list!! public class MergeSort { p...
I'm trying to understand the space requirements for a Mergesort, O(n). I see that time requirements are basically, amount of levels(logn) * merge(n) so that makes (n log n). Now, we are still allocating n per level, in 2 different arrays, left and right. I do understand that the key here is that when the recursive functions return the sp...
Hi we have merge sort for two arrays or linked list how can I write merge part for more than two linked lists? please help me thanks ...
I'm trying to implement mergesort in Coldfusion, but it is spitting out incorrect results, code: <cffunction name="mergeSort" hint="Sorts arrays of structs"> <cfargument name="arr" type="Array" required="yes"> <cfif Arraylen(arr) LTE 1> <cfreturn arr /> </cfif> <cfset left_ = ArrayNew(1)> <cfset right_ = ArrayNew(1)> <cfset mid_ = ...