C++ :: Extending STL Algorithm
Jul 24, 2013
I wrote a version of find_all() which searches through containers for matches and returns another container that holds iterators pointing to each match. When I compared what I wrote to what the authors of Professional C++ wrote, I found the two find_all() functions to be very different.Here they are:
//Mine
template<typename Iterator, typename Predicate>
std::list<Iterator> find_all
(Iterator front, Iterator back, const Predicate& match) {
std::list<Iterator> toreturn;
for(; front != back; ++front) if(*front == match) toreturn.push_back(front);
[code]...
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Sep 10, 2012
I'm trying to write an object oriented application framework. The programs can be console or GUI based, but I'm having some difficulty providing a consistent interface for outputting structures. The structures will be displayed by a variable description and its value. So, for a RECT structure the output on console would look like the following.
Code:
left 0
top 0
right 100
bottom 200
The numbers should be aligned next to their description. In console mode, white space must be appended to each description. In GUI, this extra process will not be necessary (some other processing might be, but it will be different).
The right way to display data in C++ is of course using a stream and defining the appropriate operator<<.
Code:
std::ostream& operator<<(std::ostream& strm, const RECT& r)
{
strm << "left" << r.left << "top" << r.top << "right" << r.right << "bottom" << r.bottom;
return strm;
}
Note that endl and the spacing has been omitted. This is because GUI output will also be implemented as a stream and they do not require a carriage return or padding. Should I define a StructStream object?
After I use the structstream object to store the output as a stream how should the output be written to the screen. Should I call cout from within the stream object. Should I have two buffers, one which borrows cout.rdbuf()? Should I call printf? Should I open another standard out file and use write? Should I convert the buffer to a string which will be display by cout or a winout? what I should do?
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Jun 3, 2014
The program is when a person clicks a button this button updates 2 separate listbox one tracks the total rolls the other displays the total amounts of frequency afterwards adjusting labels as a scaling measurement.
The problem I am having is right at the end where I am trying to adjust the width of the label this is what I have. It is highlighting the word "Items" for each label and says that Non-Invokable member 'System.Windows.Forms.ListBox.Items' Cannot be used like a method L2 is a label. Additionally I have added in the information for one of my loops below the line I am having trouble with this loop is created to determine how many lines are in the listbox of rolls and I have no trouble with this just thought id add it for additional information I dont think I need to add the rest of the code but I can if needed.
L2.Width = int.Parse(lstfrequency.Items(0).ToString());
TL = 0;
for (I = 0; I <= 10; I++)
{
TL += int.Parse(lstfrequency.Items[I].ToString());
}
lstfrequency.Items.Add(TL);
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Apr 9, 2014
I am writing a simple console-based tic-tac-toe game. I am trying to write a function to check whether someone has won the game.
The board data is saved in an array called board: Code: int board[3][3] with each element corresponding either to an empty spot, an X, or an O, using the numbers 0, 1, and 2, respectively. For clarity:
Code:
#define EMPTY 0
#define X 1
#define O 2 Here is my function: Code: int check_state(int board[3][3]) {
int winner = 0;
[Code].....
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Mar 7, 2013
A few days ago I got a "bright idea" to see if I could match a string, with an arbitrary length from 1 to 12, to its formulated sequence by using an algorithm to find all possible combinations of the integer combinations from 0 to 9 at each length (1 to 12).
Example: Desired numerical combinations from integers 1 to 3:
At Length 1:
1, 2, 3
At Length 2:
11, 12, 13, 21, 22, 23, 31, 32, 33
At Length 3:
111, 112, 113, 121, 122, 123, 131, 132, 133, 211, 212, 213, 221, 222, 223, 231, 232, 233, 311, 312, 313, 321, 322, 323, 331, 332, 333
And so on until the nth length (in my case a length of 12).
First off, I would like to say that this is not as easy as I thought. I clearly underestimated the problem seeing as I've spent hours attempting to write a working algorithm, but feel like I've made no progress.
Here are a few of my attempts:
Attempt 1:
#include <iostream>
#include <algorithm>
#include <math.h>
#include <string>
[Code]....
I can't exactly explain this one. It works if the length is 2 or less; however, the order of the output is horrendous.
Attempt 3: I tried using recursion, but only found myself getting more and more lost the further I tried developing my function. Cannot find my work for this attempt.
I would really like to figure this out on my own, but I am very stuck as you can see. I also lack time that I can spend working on this since im a full time student.
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Jun 27, 2014
I have VRP algorithm written in C++, run with command prompt Windows. input (command line) -> VRP.exe -> output (txt file)
Now I want to built a website to run it as SaaS. How to run an exe application(compiled c++) in server used as Saas? What kind of programming do I have to use? Ruby or html5 or others? I don't know how to start.
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Aug 27, 2013
i was trying to achieve a better way of game looping. so i have a game loop algrithm. but i dont think its quite good. i want it to be better.
here is my algorithm
bool quit = false;
while(quit == false) {
while(blah blah events)//here we hold events {
if(the user want to quits) {
quit = true;
[code]....
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May 12, 2014
To construct and write down algorithm of determination of the sum of squares of consecutive integers with recursion use. I tried to do something:
public static int RecSumSquare(int x, int n)
{
if (n < 0) throw new ArgumentException("n should be greater than zero");
if (n == 0) return 0;
else return x*x+RecSumSquare(x, n - 1);
}
But I don't know as the beginning and the end of this algorithm will look.
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Mar 10, 2014
I'm still a beginner at C++ programming, I have tried to implement some optimization algorithms (related to database) in C++, I cannot say it is going as far as I thought it will be, some errors does not even make sense, I will cut to the chase, I need to implement SA (Simulated Annealing) in C++, SA, which is an example of the Randomized Algorithms, functions on the concept of randomness and probability. In addition, I searched the internet with no (let say "accurate") code that might give me insight on how to begin, I only found one code for SA that I could understand, and edited it (which will be shown below), still looking to enhance and correct it more.
The code for SA is as follows:
Code:
#include "stdafx.h"
#include <iostream>
#include <time.h>
#include <stdlib.h>
#include <cmath>
[Code] .....
If the concept of Simulated Annealing is not clear, you may refer to the following papers which can be found in a simple Google search: Simulated Annealing Algorithms: an overview.An Introduction to Interacting Simulated Annealing. Query Optimization (there is a sub-section for Simulated Annealing in this paper that explains SA briefly) ....
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Sep 17, 2014
I'm trying to draw and pivot a rectangle. How to get the new coordinates if I turn it 90 degree for example?
From this:
To this:
This is not good because it will reduce it in size.
Code:
int size = 50;
if(b) // draw rectangle
{
POINT points[4] =
{{xCoord, yCoord},
[Code] ....
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Jun 3, 2013
Trying to multiply to matrixes using the following algorithm,
Code:
ABrec(A,B)
n=A.rows; //n must be multiple of 2
C is a new n*n matrix.
if(n==1)
C[0][0]=A[0][0]*B[0][0];
[Code] ....
but the code doesn't work !!!
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Aug 3, 2014
Now I know there's a simple way to calculate highest value. But here i have this algorithm which i understood part of it.
I know that *largest is point to the first element of begin which is 5. so in the first if statement its 5<5 at the first iteration ?
// i marked the parts i didnt understand with " //"
Code:
#include <stdio.h>
int *print(int *begin ,int *end ){
if(begin==end)
return 0;
int *largest = begin;
[Code] ....
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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]...
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Jul 22, 2014
write an algorithm using stack to determine if an input of string is in the form xCy where y is the reverse of x.x and y are strings of A and B. eg : AABACABAA
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Mar 25, 2013
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]....
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Jun 22, 2014
I made this program in C++ that should, by a genetic algorithm, build a word identical to the initial one improving itself recursively.
The code is:
main.cpp
#include <stdio.h>
#include <cstdlib>
#include "Genetic.h"
using namespace std;
[Code] ....
The problem is: when running with gdb it gave me this
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
CREATA LA PRIMA POPOLAZIONE
PARTE L'EVOLUZIONE
TROVATO BEST: fzlrq
TROVATO BEST: hglhe
Program received signal SIGSEGV, Segmentation fault.
0x000000000040720e in Genetic::Gene::Gene (this=0x7fffff7ff030) at Genetic.h:20
20 struct Gene {
The line corresponds to the struct declaration. Every 1000 executions it runs well.
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Feb 27, 2014
I am looking for a compression algorithm which compress sequence of random numbers (will be in sorted order but some of the numbers may be missing). The compressed data will be sent to other component where decompression will take place.
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Nov 19, 2013
I wont search realization of Lee algorithm in Game(2d turn-Based Strategy 20 x 30 cells),need AI on C++ ???
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Aug 3, 2014
Any simple example of deletion from the end here is the algorithm
1. If n=0 then array is underflow step
2. A (UB) <------- null
UB <---- UB1
3. Stop
Example:
Suppose array
Arr[0]=5 , Arr[1]=8 , Arr[2]=10 , Arr[3]=7
After Deletion
Arr[0]=5 , Arr[1]=8 , Arr[2]=10
How to delete the last element of array?
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Jan 28, 2014
Genetic Algorithm Library in C++? I looked for in the web, there are a lot of them, have you tried some? Is there one up to date or with a good community?
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Nov 16, 2013
How to write Algorithm / Design
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Feb 6, 2013
I've been stuck on a divide a conquer algorithm problem for about an hour now, and I'm not sure how to solve it. I need to use divide-and-conquer to implement an algorithm that finds the dominant element of an array of positive integers and returns -1 if the array does not have a dominant element (a dominant element is one that occurs in more than half the elements of a given array).
No sorting may be used, and the only comparison that may be used is a test for equality.
I understand the general process I need to follow to solve this problem, but I'm not sure exactly how to convert my thoughts to code. I know that if a number x is the dominant element of an array A, the x must be the dominant element in either the first half of A, the second half of A, or both.
Here is what I have so far.
#include <iostream>
#include <string>
#include <vector>
using namespace std;
int find_dominant(int *A, int p, int r) {
[Code] ....
The program must run in O(n log n) time.
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May 11, 2013
I am currently trying to implement a pathfinding algorithm using c++ and opengl. My code so far is shown below:
#define OPEN 1
#define CLOSED 2
#define UNVISITED 3
#define BLOCKED 4
#define HIGHLIGHT 5
#define ONROUTE 6
#define GOAL 7
#define GSIZE 20 // size of tile grid
#define ISTART 15 // index position of starting tile in grid
[Code] ....
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May 8, 2013
i have been trying to call out the tea algorithm from wikipedia. However i keep getting a segmentation fault. Am i calling it out the wrong way? Below are the snippets
methods taken from wikipedia
void encrypt (uint32_t* v, uint32_t* k) {
uint32_t v0=v[0], v1=v[1], sum=0, i; /* set up */
uint32_t delta=0x9e3779b9; /* a key schedule constant */
uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3]; /* cache key */
for (i=0; i < 32; i++) { /* basic cycle start */
sum += delta;
[code]....
i tried to encrypt a test text and casting it to the uinstd32_t type. However it always gives me a segmentation fault.
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Mar 21, 2015
I actually want some latest algorithms, methods or techniques which can be used in plagiarism detection software for detecting the text plagiarism offline.
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Jul 28, 2012
I have a doubt in the PJW algorithm of the Hash Table.
What is the logic in shifting the bytes by this specified number as specified in the pjw algorithm.
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