C :: Subarrays For Merge Sort
May 15, 2013
Code:
/* Mergesort: Use merge() to sort an array of size n */
#include <stdio.h>
#include <stdlib.h>
void mergesort(int key[], int n) {
int j, k, m, *w;
for (m = 1; m < n; m *= 2)
[Code] .....
Question : Modify mergesort() so that it can be used with an array of any size, not just with a size that is a power of two. Recall that any positive integer can be expressed as a sum of powers of two. For example,
27 = 16 + 8 + 2 + 1
Consider the array as a collection of subarrays of sizes that are powers of two. Sort the subarrays and then use merge() to produce the final sorted array.
I tried so many algorithms and all failed!! What i dont know is how to create subarrays ?
View 3 Replies
ADVERTISEMENT
Dec 24, 2014
i can't seem to get this merge sort to work. running through gdb though;
Code:
*Filename: mergeSort.c
*Usage: This implements merge sort algorithm to sort and array of numbers.
*/
#include <stdio.h>
#include <stdlib.h>
}
[code]...
View 2 Replies
View Related
Apr 8, 2013
My programs gives a segmentation fault for large n (n=9999999). It works fine for small n. Where n = total numbers to sort
List<long>* Merge(List<long> *ParentList)
{
if(ParentList->length()==1)
{
[Code]....
View 4 Replies
View Related
Apr 28, 2014
I tried to keep the coding style as similar as possible. I tested these with 4 million (4x1024x1024) 64 bit unsigned integers, Visual Studio 2005, 64 bit mode, Win XP X64, Intel 2600K 3.4ghz cpu. The average time for top down = 3.7 seconds, bottom up = 3.5 seconds.
Code: // tsorttd.h - top down merge sort
template <class T>
T * TopDownMergeSort(T a[], T b[], size_t n) {
TopDownMergeSortAtoA(a, b, 0, n);
[Code]....
View 13 Replies
View Related
May 3, 2013
Code:
typedef vector<int> LIST; // LIST can be a vector of any comparable type
static LIST merge_sort(LIST &linp){
size_t i, width;
LIST lout(linp.size()); // second list for output
[Code] ....
View 14 Replies
View Related
Apr 9, 2014
I have been trying to merge the two arrays in merge sort but I am not able to do so. I am getting only half of the array.
Code:
int i,j,k,a[100],n,temp;
printf("Enter array size: ");
scanf(" %d",&n);
printf("
Enter the numbers:");
[Code] ....
View 2 Replies
View Related
Jul 24, 2013
I'm trying to implement the Merge-Sort algorithm. I only had the pseudocode for it and have some problems coding this into C.
I have only covered pointers recently and I tried using them, which did not work. I started with the code for the merge algorithm and only used a 10 element array, which was already divided into two sorted subarrays:
Code:
#include <stdio.h>#include <stdlib.h>
int main() {
int a[5]={1,5,6,10,13}, b[5]={4,8,9,10,14},c[10], *i,*j,k;
[Code].....
This is the result that I get:
Code: 1 4 5 6 8 9 10 10 13 0
So I think the problem occurs because in the second to last loop i is incremented again, but the end of the array is already reached, and the compiler has no element a[6] to compare with *j in the last run of the loop. Is there generally a better way to implement Merge?
View 10 Replies
View Related
Feb 19, 2013
i write code that's merge two linked list without sort ....
node * merage (node * list1, node * list2) {
// check witch list is empty
if (list1 == NULL) return list2;
if (list2 == NULL) return list1;
if ( list1 == NULL && list2 == NULL ) return NULL;
[Code].....
View 1 Replies
View Related
Mar 15, 2014
I am getting an error trying to convert from nodeType<Type> to nodeType<Type>* in my recursiveSort function and why this is happening.
#ifndef H_linkedListIterator
#define H_linkedListIterator
#include <iostream>
template <class Type>
struct nodeType {
Type info;
[Code] ....
View 7 Replies
View Related
May 29, 2014
// mergefile2norecreation.cpp : definisce il punto di ingresso dell'applicazione console.
//
// Filemerge.cpp : definisce il punto di ingresso dell'applicazione console.
//
#include "stdafx.h"
int _tmain(int argc, _TCHAR* argv[]) {
TCHAR inputfile1[MAX_PATH];
TCHAR inputfile2[MAX_PATH];
TCHAR outputfile[MAX_PATH];
[Code] .....
There is a smart way to make a merge sort between 2 file already ordered? I had try it ,and above there is my result,it works but i think that it's possible to do it in a smart way...
View 4 Replies
View Related
Feb 18, 2014
I am looking for a function or algorithm to best merge and sort similar content between two lists of unordered strings each in individual files (very large files ~200mb each).
For example, these files have a common first string and are merged based on them:
File 1:
red, apple
green, truck
blue, car
yellow, ball
orange, candy
File 2:
gold, necklace
green, tree
yellow, sticker
blue, water
red, bag
I am looking for the following output:
Output:
red, apple, bag
green, truck, tree
blue, car, water
yellow, ball, sticker
orange, candy
gold, necklace
View 6 Replies
View Related
Apr 17, 2014
So I have a file with 2 float numbers like this
0.041631 0.176643
0.364602 0.091331
0.092298 0.487217
0.526750 0.454433
0.233178 0.831292
0.931731 0.568060
0.556094 0.050832
0.767051 0.018915
0.252360 0.298197
0.875981 0.531557
I would like to place the first column in one array and second in another. I am using the merge sort and merge algorithm from my book to sort the first column (x-coord) in descending order and the second column (y-coord) in ascending order. The output would look like this.
(where, x, y)
6: 0.931731 0.018915
10: 0.875981 0.050832
8: 0.767051 0.091331
7: 0.556094 0.176643
4: 0.526750 0.298197
2: 0.364602 0.454433
9: 0.252360 0.487217
5: 0.233178 0.531557
3: 0.092298 0.568060
1: 0.041631 0.831292
I am ignoring the where(line number) for now. The error I get is: cannot convert 'points_struct*' to 'int*' for argument '1' to 'int mergesort(int*, int, int)'.
So my question is how to get my points_struct arrays to work with the algorithm I have from book. Here is what I have so far.
#include<iostream>
#include<fstream>
using namespace std;
[Code].....
View 4 Replies
View Related
Oct 15, 2014
This is in response to the bubble sort and selection sorts for linked lists. On my system, (Intel 2600K, 3.4ghz), it sorts a list with 4,194,304 nodes containing 64 bit unsigned integers in about 1.05 seconds.
Code:
#define NUMLISTS 32
/* number of lists */
typedef unsigned long long UI64;
typedef struct NODE_{
struct NODE_ * next;
UI64 data;
[Code]....
View 6 Replies
View Related
Oct 3, 2014
This is in-place merge sort, for merge function.
LinkedListNode::LinkedListNode(int value) {
this->next = NULL;
this->value = value;
}
LinkedListNode *mergeSortedLinkedLists(LinkedListNode *firstList, LinkedListNode *secondList)
[Code] ....
View 3 Replies
View Related
Nov 27, 2014
I'm trying to sort a deck from file with merge sort.I have all my code working except merge sort function .
#include<iostream>
#include<fstream>
#include<stdlib.h>
#include<stdio.h>
using namespace std;
int temp;
int br = 1;
[Code] ....
View 10 Replies
View Related
Feb 25, 2013
I have created a program that first sorts a series of numbers that are input dynamically then an option is given to either use a sequential search or a Binary search. my sequential search works fine but the merge sort coupled with the binary search has a small bug that I just can't seem to figure how to eliminate. I first used my own merge sort but it was really in efficient so a I took a more efficient example and incorporated it in my program but I cant seem to get rid of this bug I'm dealing with. and it seems to be causing a further problem with the Binary seach.
Code:
#include <iostream>
#include <cmath>
using namespace std;
const int N = 10;
[Code] .....
View 3 Replies
View Related
Jul 8, 2013
I am trying to implement a recursive merge sort, and I've just barely begun. I am getting some warnings:
merge_sort.c:15: warning: ISO C90 forbids variable-size array 'left'
merge_sort.c:15: warning: ISO C90 forbids mixed declarations and code
Code:
#include <stdio.h>
#include <string.h>
static void
merge_sort(int *a, int n)
[Code] ....
I am using gcc 4.2.1 and I am compiling with -Wall and -pedantic.
View 6 Replies
View Related
Oct 27, 2013
I'm trying to write a code that takes two arrays from the user (presumably in ascending order) and then passes the sizes of both arrays and a pointer to each to a separate "int* mergeArrays" function that will merge sort the two. I've written a lot of the code, but I can't get it to compile. I get errors: lab6.c: In function "main":
lab6.c:31:14: error: expected expression before "int"
mergeArrays(int* firstArray, int size1, int* secondArray, int size2);
^
lab6.c:31:14: error: too few arguments to function "mergeArrays"
[Code] ....
View 2 Replies
View Related
Apr 10, 2013
Whenever I try to call merge sort on large numbers say n=10000000. It gives an error. It works fine for small numbers, even though I have declared my Lists on the heap.
The below code is just the divde part.
List<long>* Merge(List<long> *ParentList) {
if((ParentList)->Length==1) {
return ParentList;
[Code] .....
View 1 Replies
View Related
Apr 7, 2014
How can I use "delete[]" on all pointers on the stack, using a mixture of top and pop functions or variables
View 2 Replies
View Related
Oct 25, 2014
I've implemented the merge sort algorithm and used the 'merge' part for counting the number of split-inversions in an array as part of an assignment for an online course. How ever, the out put array is not a sorted version of the input array and as a result the number of split inversions obtained is wrong. I think that there is some thing wrong in the way I am indexing arrays.
I've used ' cout ' to print the values of indexes to see exactly what values are being passed in during the recursions.
Code:
#include <iostream>
using namespace std;
int length=0,mid=0,inv=0;
void mergesort(int arr[], int first, int last) {
cout << "first: " << first << " " << "last: " << last;
cout << endl;
[code].....
View 5 Replies
View Related
Sep 16, 2012
I am trying to code a merge sort algoritm, using my knowledge of C++. I have made some code but it is not working. It is giving some random results.
Code:
#include <cstdlib>
#include <iostream>
using namespace std;
void print(int *niz) {
[Code] ....
View 1 Replies
View Related
May 3, 2013
# include <iostream>
# include <vector>
# include <cstdio>
# include <algorithm>
# define inf 100000
using namespace std;
int cnt;
vector<int> merge( vector<int>& left, vector<int>& right) {
[Code] ....
View 6 Replies
View Related
Aug 19, 2013
Example radix sort function to sort an array of 64 bit unsigned integers. To allow for variable bin sizes, the array is scanned one time to create a matrix of 8 histograms of 256 counts each, corresponding to the number of instances of each possible 8 bit value in the 8 bytes of each integer, and the histograms are then converted into indices by summing the histograms counts. Then a radix sort is performed using the matrix of indices, post incrementing each index as it is used.
Code:
typedef unsigned long long UI64;
typedef unsigned long long *PUI64;
PUI64 RadixSort(PUI64 pData, PUI64 pTemp, size_t count) {
size_t mIndex[8][256] = {0};
/* index matrix */
PUI64 pDst, pSrc, pTmp;
size_t i,j,m,n;
UI64 u;
[Code]....
View 9 Replies
View Related
Mar 22, 2013
how to sort a 1D array using function sort().but if i have a 2D array how do i sort only 1 row of it (or column)?
View 2 Replies
View Related
Feb 19, 2014
You will write a program that uses a multidimensional array having 3 rows and 8 columns and sorts each of the rows using both a bubble sort and a selection sort.
You must declare the array inside of main. You will have a for loop containing the calls to bubbleSort and selectionSort. You need to pass into function bubbleSort and selectionSort the following: 1) each column of the multidimensional array, 2) the size of the column, and 3) a particular row number of the multidimensional array to be used for printing out the "pass" shown on the following pages.
I keep getting an error that the identifier for bubbleSort and selectionSort is not found. (Error C3861) Also, I feel like I'm missing something in int main() to get it to sort properly.
# include <iostream>
using namespace std;
int main()
{
[Code].....
View 14 Replies
View Related
