So I am working on a dual pivot quicksort, I can correctly sort the array the first time around however in the main it is called again on the sorted array and in the function I get a seg fault at line 17 in sort.cpp, for the life of me I cant figure it out as the values are the same when I pass it in the first time. Here is the code:
main1.cpp
#include <iostream>
#include "movement.h"
#include "sort.h"
using namespace std;
int main() {
const int size = 10;
T array[size] = {6, 5, 1, 8, 4, 7, 2, 9, 6, 3};
Task: To create a recursive function to sort elements in an array of integers.
The function must start the sorting from the first element, and the recursion calls must go on until the last element in the array is sorted. In each step of recursion, the function must work only with the subset of array elements that have not been sorted yet.
Problem: I am getting a 'Segmentation fault: 11' in the recursive call to the function (please, see the code below).
Environment: Mac, OS X = Mavericks
Code: //////////////////////////////////////////////////////////////////////////////// ////////// Recursively sorting an array of ints. ////////// Arguments: array, array size, index from where to start sorting. void sort_incr_array_int_recursive(int a[], int size, int i){ int tmp, idx_small, small = a[i];
// Locating the smaller element in the array section.
I've been working on a matrix class and I ran into a problem in writing my matrix class. I keep getting 0 as a determinant and with some debugging, I found that I was losing allocated data or something similar. This algorithm I'm pretty sure works because I used this same algorithm in a function I made in python. [URL] .... That's where I found the algorithm.
I have a problem to implement a recursive version of an algorithm that I made, I get different values. Here is the code so Iterative (OK) and Recursive code form that is not OK.
The data sets do not give equal:
The algorithm is given two source and target positions on a board, find the number of paths between them...
Input Example: 5 2 3 4 4
Output Example: 5
Iterative Algorithm ( OK )
Code: #include <iostream> #include <stdio.h> #include <cmath> #include <algorithm> #include <string.h> #include <vector> #include <queue> using namespace std; int n , dp [1000][1000], x, y, xx, yy;
My maze algorithm must be able to count total steps. He is not allowed to "jump" from a deadend back to the cross-way he originally came from.
Code: int R2D2Turbo::findIt(Labyrinth* incLab, int x, int y){ if ((x == incLab->getExit().x) && (y == incLab->getExit().y)) { return 1;
[Code] .....
Due to the nature of recursive algoirthms, he jumps instead of moving the way back from the deadend one by one... The only solutions I could think of are way overloaded...
My assignment is to make a program that tests whether something is a Palindrome or not using a recursive function. Also, in order to test what type the Palindrome is (if it is indeed a palindrome) I'll need to merge sort it. Now alphabet characters, spaces, and numbers are all allowed, as long as the spaces line up with the spaces in the original input. And yes this is user inputted. I can show you what I've got so far and then I'll tell you what my problem is.
#include <iostream> #include <istream> #include <string> #include <string.h> #include <conio.h> using namespace std; /************To Test if Palindrome*******************/ bool IsPalindrome(char *str, int size) { if( str[0] == str[size-1]);
[Code] .....
Now my problem is that I can't seem to get the test to work correctly. Since the word is user inputted I don't have any way of knowing the size so that kind of complicates it a little bit. The other thing is I was told by my professor that I need a boolean flag to make it work, and I need to set the value to the return of the IsPalindrome function. I'm not sure how to do that. I also don't haven't been able to add in the MergeSort yet, so the Order and Type don't really work correctly because I'm not sure how to get int len for it. (len is length)
i want to write an array sorting program that works with recursive function.but i can not do it.
my algorithm
Recursive find the min value find the min value and save it find the min value and save it and remove it from loop put the rest in loop again find the min value again .. ...
i didnt write the function because i dont know how will it work
Code:
#include<stdio.h> #include<stdlib.h> #define s 5 void main() { int a[s]={25,3,2,4,1},c[s]; // c[s] for new sorting int i,ek,j; //ek = min
I am fairly new to dynamic memory allocation and I keep getting a segmentation fault in this code of mine. This is what the method should do:void sort StringsByReversePoints(char **myWords): This function sorts the char* values (i.e. strings) of myWords in descending order of point value by calling getWordPoints as a helper function and comparing adjacent words. This simple (but inefficient) sorting algorithm starts at the beginning of myWords array and sweeps to the end comparing adjacent values and swapping if they are out of order. After N (length of the array) sweeps the array is fully sorted. Note that efficiency can be improved by a factor of 2 by shortening each successive sweep by one, since the first sweep will have guaranteed the minimum point value word is the last element of the array, the next sweep guarantees the last two elements are correct, and so on....Additionally, if a given sweep results in zero swaps then the array is sorted and you can return immediately.
I need to take info in the following format (no blank/skipped lines):
last name, first name street address city, state zip code
And dynamically allocate space for it. I need to use structs, and I need to use an array of pointers to structs to point to them. I know I probably have quite a few problems with my code, but so far, I am able to store and print back the data without issue. In the following code, I only make the loop run 3 times just so I can test it with manual input into the console, but eventually the max will be 50, or until end of input (will be doing IO redirection with a txt file).
Like I said, I can store and print the data fine, but am getting a segmentation fault when trying to sort the info.
I'm currently trying to code a sorting algorithm program.
let's asume I have a string given: aa, aaa, bbb, bas, zya!
I first of all want to split the given string on commas and '!' tells the program the string ends here and is no part of the last word. lower and upper case is not important at the moment. trying to implement everything with standard libary
output should be like that ofc: aa aaa bas bbb zya
I already looked into the bubble sort algorithm and I think it benefits my needs. Just wanted to know how I should start out with the string split.
I have a list of latitude and longitude coordinates which are supposed to trace the outline of a city. Somehow they got scrambled so that they are now out of order. I'd like to write a program to arrange them such that one could follow from one coordinate to the next and trace the perimeter. However, I've run out of ideas for algorithms. What I did so far was a simple search for the nearest coordinate, starting from the first coordinate pair in the array. This produced local regions which worked rather well, but globally there were large jumps as the algorithm ran out of nearby coordinates and was forced to jump across the map.
Is there already a developed algorithm to perform this function?
This program is sorting a randomized array of integers using the bubblesort algorithm.
I am trying to modify n correct the source code,so that the swapping of two values will be done by a function called swap values() by using call-by-reference but function should have as arguments only the two array elements that must be exchanged. (Note: do not pass the whole array to the function!) .We consider an array with the first element containing the number of elements in the array, followed by 10 randomly initialized integers (elements).
The code must sort the 10 elements in ascending order.
Compile: g++ -Wall sorting.cpp -o sorting */ #include <iostream> #include <stdlib.h> using namespace std; int main() { const int SIZE=10;
I have an school assignment that asks me to measure the most famous sorting algorithms for performance in terms of number of steps and CPU running time. ( Here I'm testing for running time)
I decided to test for bubble sort first:
#include <iostream> #include <ctime> using namespace std; void bubbleSort(int ar[], int size) { int temp;
[Code] ....
So basically what I want to know is:
1. Is this clock function giving the correct CPU running time?
2. Is there any way to write code that would measure the number of steps for each algorithm?
3.I need to test it for number of integers=100 then 200, then 300... Well you get my point, and I don't want to have to actually input 200 numbers with my keyboard. Is there any way to generate as many entries as I want?
I am having trouble with recursively modifying a <string, int> map (NCPB) -- when I call for what should be existing values in the map, I get "junk" values back (integers, but sometimes negative, large numbers, etc.). I've posted only the problematic function here:
int Count_Noncrossing(string RNA, map<string, int> &NCPB) { map <string, int>::iterator it; if (RNA.length() <= 2)//perfect short interval can only have 1 match; return 1 { return 1;
[Code] ....
The problem is that when I ask for existing map values in a subsequent recursive call, they don't seem to be there. I imagine I'm missing something straightforward but can't seem to find it. I've tried declaring the map globally, passing it (as shown above), nothing seems to work.
The recursive function is bolded, i got feedback and was told that the static variable made the function seem a lot like a iterative function but he did not say why.
Code: #define MAX 100 #include <string.h> #include <stdio.h> int checkPalindrome(char string[MAX]); int checkRecPalindrome(char string[MAX]);
Now the recursion will generate a large recursion tree, like if n=5, 5 will call (5-1), (5-2) or 4,3 . What I want to know is, will fibo(n-1) will be called 1st go all the way to the base case 1, then do the summation or fibo(n-2) will be called right after fibo(n-1) ?
the functions checks if the word is a palindrome like"level" "madam" etc. but with input "dfdfdfdffdfd" my recursive function fails.
Code:
/* main.c - Created on: Nov 9, 2013 - Author: Kaj P. Madsen*/ #define MAX 100 #include <string.h> #include <stdio.h> int checkPalindrome(char checkString[MAX]); int checkRecPalindrome(char checkString[MAX], int strLgt, int a); }
[code]....
results from "dfdfdfdffdfd" added some print to see that its the variables a and strLgt not functioning properly
Code:
dfdfdfdffdfd. The word is not a palindrome(iterative) strLgt: 11 a: 0 a: d strLgt: dstrLgt: 10 a: 1 a: f strLgt: fstrLgt: 9 a: 2 a: d strLgt: dstrLgt: 8 a: 3 a: f strLgt: fstrLgt: 7 a: 4
I am implementing a recursive descent parser that recognizes strings in the language below.
The grammar: A -> I = E | E E -> T + E | T - E | T T -> F * T | F / T | F F -> P ^ F | P P -> I | L | UI | UL | (A) U -> + | - | ! I -> C | CI C -> a | b | ... | y | z L -> D | DL D -> 0 | 1 | ... | 8 | 9
My input file has the following two strings: a=a+b-c*d a=a**b++c
The desired output:
String read from file: a=a+b-c*d The string "a=a+b-c*d" is in the language. String read from file: a=a**b++c The string "a=a**b++c" is not in the language.
[Code].....
When I test the code without reading the text file and just write a string in the source code, it appears to parse fine. I believe my main problem is in the int main function and how i am reading the text file and outputting it. I was able to write the same program fine in Java.
