Search DaniWeb - heapsort

HeapSort help 12 Years Ago by baby_c Hello friends..! I tried to implement HeapSort algorithm in Java. but I've…out guys..? thank you in advance. [CODE]class heapSort{ int getParent(int i){ return (int) Math.…0;i--){ this.maxHeapify(A, i); } } int[] heapSort(int[] A){ this.buidMaxheap(A); for(int i=A… Re: HeapSort help 12 Years Ago by baby_c … [URL="http://en.wikipedia.org/wiki/Heapsort"]WikiPedia[/URL] (quoted below)? [CODE] /* function heapSort(a, count) is input: an unordered…(length[A]/2) down to 1 do Heapify (A, i) HEAPSORT (A) BUILD_HEAP (A) for i ← length (A) down to 2… Re: HeapSort help 12 Years Ago by Taywin … [URL="http://en.wikipedia.org/wiki/Heapsort"]WikiPedia[/URL] (quoted below)? [CODE] /* function heapSort(a, count) is input: an unordered… Re: HeapSort help 12 Years Ago by baby_c … 34 here's the complete code.Thanks guys. [CODE]class heapSort{ int getParent(int i){ return (int) Math.floor(i/2…)/2);i>0;i--){ this.maxHeapify(A, i); } } int[] heapSort(int[] A){ this.buidMaxheap(A); for(int i=A.length… Re: HeapSort help 12 Years Ago by Taywin …="http://www.personal.kent.edu/~rmuhamma/Algorithms/MyAlgorithms/Sorting/heapSort.htm"]here[/URL]... Surprisingly, the pseudo code of the… Re: HeapSort help 12 Years Ago by baby_c …="http://www.personal.kent.edu/~rmuhamma/Algorithms/MyAlgorithms/Sorting/heapSort.htm"]here[/URL]... Surprisingly, the pseudo code of the… Heapsort problems 14 Years Ago by wmsigler …[code] /****************************************************************************** * Program: * Assignment 17, Heapsort Program * Summary: * From the command line…cout << endl; } /****************************************************************************** * heapsort * Desc: Performs a heapsort on a given vector, with O(n log… heapsort help it NOT SORTting the numbers in the Heap!!!! 12 Years Ago by newbyc++ …the Elements adjust(list, list[0],--i); } } // end heapsort void Sorts::inserth()//i { ofstream myfil; myfil.open ("…ELEMENTS]={6,5,3,1,8,7,2,4}; heapsort(list,ELEMENTS); cout<<endl<<&… list,int n); void insertsort(int A[],int length); void heapsort(int list[], int n); Sorts(void); ~Sorts(void); };… Heapsort Problem 11 Years Ago by osiron … static void sort(int [] a) { a[0] = Integer.MIN_VALUE; Heapsort.build(a); for(int endOfHeap = a.length-1; endOfHeap>….out.print(a[i] + " "); } System.out.println(); Heapsort.sort(a); printArray(a); } } Any help would be appriciated. Thanks.… Heapsort or Quicksort?? 18 Years Ago by tlly Which type of sorting would you prefer??Quicksort or HeapSort?Even though both of them have complexities of (N log(N)), quicksort in some situations degenerates to O(n*n).But however heapsort is known to be less efficient than quicksort!!So which one to use in practice?Under what criteria would you choose between those 2??An example would be?? Re: HeapSort help 12 Years Ago by Taywin There are certain issues with the pseudo code you gave above. - What is left[i]? Is it the same as Left(i)? - "for i ← length (A) down to 2 do" is obviously wrong because you cannot access an array at A[length(A)] - The heap-size is a global variable of the class. You must not add it into your array. - When you call swap(), you … Problem with heapsort 15 Years Ago by christiangirl … list[count]; fixup(item, count, 9); } } void HeapSort::heapsort() { int count; int item; buildheap(); for(count = …<< endl; } int main() { HeapSort heap1; HeapSort heap2; int x = 0; int numberInput; cout… Help with HeapSort 14 Years Ago by DCV …::getEntries() { return index; } //------------------------------------------------------------------------------------ // HeapSort() // // Performs HeapSort on the list of values. // // Preconditions…. // //------------------------------------------------------------------------------------ void Sorts::HeapSort() { int i=0,… need help with heapsort 14 Years Ago by shani1986rox …asciiArrayForHeap[count]=asciiCount; count++; } printUnsortedArray(words); heapsort(asciiArrayForHeap); public static void printUnsortedArray(String showArray[]){ …max_heapify(a, biggest); } } public static void heapsort(int a[]){ int []A=setHeap(a, a.… Floyd heapsort 13 Years Ago by DrewS Hello, I am supposed to implement heapsort proposed by floyd. I got it as a home work. …I know the simple implementation of heapsort. but what i am supposed to do is- while sorting… Need help with heapsort implementation 13 Years Ago by Hockeyfreak889 i need to make a program that implements a heapsort using a binary tree. i understand the algorithm for how … How to use heapsort in vb.net 2008 10 Years Ago by ReyJEnriquez … does not produce mi in aplhabetical oreder. I am using Heapsort as a sorting algo...and please help me Hope to… Re: Heapsort problems 14 Years Ago by bamcclur Your percolateDown function should have <， not <= in both the while question and the if question。。。。 [CODE] void percolateDown(vector < int > &tree, int root, int wall) { int child; while ((2 * root + 1) < wall) { child = 2 * root + 1; if (child + 1 < wall && tree[child] < tree[child +… Re: Heapsort problems 14 Years Ago by wmsigler Awesome! It works perfectly now. Thanks for helping me find that mistake, it was so tiny that I was going nuts trying to figure out what was wrong. :) Re: heapsort help it NOT SORTting the numbers in the Heap!!!! 12 Years Ago by daviddoria Is this a homework problem or do you really just want to get the numbers sorted? If so, use std::sort from <algorithm> Re: Heapsort Problem 11 Years Ago by NormR1 Have you tried debugging the code by adding some println statements to show you what the code is doing? Try using the Arrays class's toString() method to format the array for printing: S.o.p("before=" + Arrays.toString(a)); // show before sort Re: Heapsort Problem 11 Years Ago by Taywin If you look closely, there are a couple things in your code that are off. 1) Start from looking at line 60, what are you doing there? What is the consequence of doing that? 2) Look at how you use the loop to display your array value at line 53. What range would it display? 3) You may need to consult your algorithm again. The problem seems to be … Re: Heapsort or Quicksort?? 18 Years Ago by server_crash I'd use whatever internal structure the specified object has... Why waste your time reinventing something already there? Re: Help with HeapSort 14 Years Ago by Narue [B]>Adjust(heap, heap[1], j);[/B] At a glance of the code, I really don't think heap[1] is an appropriate index in this call. It should probably be 1. ;) Re: Help with HeapSort 14 Years Ago by DCV [QUOTE=Narue;1072851][B]>Adjust(heap, heap[1], j);[/B] At a glance of the code, I really don't think heap[1] is an appropriate index in this call. It should probably be 1. ;)[/QUOTE] So, just pass "1" instead of "heap[1]?" Re: Help with HeapSort 14 Years Ago by Narue [B]>So, just pass "1" instead of "heap[1]?"[/B] Yep. Otherwise you're using whatever value is currently at heap[1] as an index for the swap, which is only likely to be safe if all of the values in the heap are valid indices, and even then it turns your heap sort into an expensive "random" shuffle. Re: need help with heapsort 14 Years Ago by adams161 [code] int b=value.length(); for (int i=0;i<=b;i++) { if (value.charAt(i)==' ') maxSize +=1; [/code] I didnt have time to look at all your code but noticed something at the top. your going to <=length in your loop here. String c= "cat"; has stringlength 3… Re: Floyd heapsort 13 Years Ago by rubberman School work? Please don't ask us to do it for you! There are a lot of resources to research this on the web. Remember, Google is your friend! I did a quick search, and found the answer to your question in about 5 seconds... Re: How to use heapsort in vb.net 2008 10 Years Ago by tinstaafl I notice you're sending the sorted data to a new datagridview. Wouldn't it be easier to just sort the datagridview? It has methods built in designed to do this. You might also want to look at the [DataTable.Select](http://msdn.microsoft.com/en-us/library/way3dy9w.aspx) method, which has a sort option and will return an array of DataRows that you… Re: How to use heapsort in vb.net 2008 10 Years Ago by ReyJEnriquez Yes @tinstaafl, it is really meant to have 2 data gridview, oldDataGridView and NewDataGridView, the old is unsorted while the new datagridview is sorted in alphabetical order....i like to use DataTable since it is a "in-memory" and it will have a faster performance when it comes to sorting in the memory...so, when data is sorted in the …