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] .....
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]...
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 ?
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]....
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]....
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] ....
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] ....
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?
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].....
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] ....
// 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...
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
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].....
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]....
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] ....
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] ....
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] .....
I want to store a very small number - too small for even a long double. However, I don't need the number to be stored very precisely - in fact, all I really need is the order of magnitude of the number. For example, the number 5.205849034425 X 10^-381 can just be stored as an integer of -381 for my purposes. I don't really care about the precision of the 5.205849034425 part.
The reason I get this very small number, is because I am multiplying together thousands of numbers, all of which are around 0.0001 in value. So, one way to do this would be to store all these individual values as simply their order of magnitude (e.g. -4) and then instead of multiplying the numbers, I would just add up their orders of magnitude. However, I am wondering whether there is a way in C++ to do this without me having to change the way I store my data - I still would like to keep the original values if possible.
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.
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] ....
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 RelatedI'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].....
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] ....
# 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] ....
I have been writing a program to generate pairs of RSA keys using small prime numbers. I have been using mpz_invert() to get a value for d for the private key. On small prime numbers it calculates the correct value, but on larger primes it calculates incorrect values.
I'm assuming there must be an upper limit to the values the mpz_invert() function can handle? If so, what is this limit to avoid erroneous values?
I need to write a program that merges the numbers in two files and writes the results to a third file. The program reads input from two different files and writes the output to a third file. Each input file contains a list of integers in ascending order. After the program is executed, the output file contains the numbers from the two input files in one longer list, also in ascending order. Your program should define a function with three arguments: one for each of the two input file streams and one for the output file stream. The input files should be named numbers1.txt and numbers2.txt, and the output file should be named output.txt.
View 1 Replies View Related