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'm trying to implement the flocking algorithm in C++. I've tried to implement it myself by making all the particles 'home-in' on the player. When 2 particles then collide within their larger bounding boxes they home-in to each other. And when the 2 particles are actually touching they repel each other until they are outside of their bounding boxes and find another particle to home-into.when I run my application the particles all home into the player and come to a stand still along the Y-axis above the player.
All the particles in question are stored in a Vector, with a pos and velocity.
for(int i = 0; i < swarm.size(); i++) { for (int j = 0; j < swarm.size(); j++) { if (swarm.at(i)->getParticleModel()->getPosition().x < gameObjects.front()->getParticleModel()->getPosition().x) { if (swarm.at(i)->getParticleModel()->getTouching() == false)
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 ?
I'm attempting to write the maximal clique algorithm for use with an adjacency matrix.I'm following a video which explains how to code and implement the algorithm using python. I want to write it for c++. URL....I'm currently trying to code the powerset function at 2 minutes into the video. I'm not sure if I should be using arrays or not.
So far I have coded the below but I dont know how to return an empty array inside an empty array (when the elts list is of size 0). I wrote an isEmpty function for the array since I cant use len(elts) like in python.
The code should use either an array/list/vector that we call 'elts' (short for elements). Then firstly, it should add the empty list [], then the rest of the power set (all shown in the video).So for example, in the case that elts = [1,2,3,4], my code should return:[ [],[4],[3],[4,3],[2],[4,2],[3,2],[4,3,2],[1],[4,1],[3,1],[4,3,1],[2,1],[4,2,1],[3,2,1],[4,3,2,1] ]
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: 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
// 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[]) {
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
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.
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;
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;
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;
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"
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.
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;