C++ :: Random Partition Into K Groups
Aug 31, 2012
How do you generate a random permutation of numbers from 0 to N without storing it in an array ? Note that duplicates are to be avoided so I can't use rand() calls to generate them. The problem I have is to partition N number of data points into k groups in random selection manner. I thought of random shuffling of indices using random_shuffle of stl but the indices need to be stored in an array. Is there a way to get N integers from [0..n] sorted in a random order, using which I can access a database ?
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Nov 24, 2014
My goal is to know if Windows is installed on an active disk partition.
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May 18, 2013
I am supposed to write a recursive function which find the partition of a number n ,, for example if n=3 , it should print 1 1 1 , 1 2 , 3
I wrote the program but i am getting the two partition 1 2 and 2 1 which are the same ,, how can i avoid that ?
this is the code :
void PrintPartition( int n , int A[] , int j ) {
if( n<=0 ) {
printArray( A, j );
return ;
} for( int i=1 ; i<=n ; i++ ) {
A[j]=i;
PrintPartition( n-i , A ,j+1 );
} }
the first call of the function is : PrintPartition( n , A , 0 ) ;
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Aug 31, 2013
I am trying to code a partition quicksort but the problem here is at the output is in an infinite loop:
The input : 4 3 5 7 2
The expected output : 2 3 4 5 7
But my output is infinite :
2 3 4 5 7
2 3 4 5 7
2 3 4 5 7
.
.
and so on
[Code:
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
/* Head ends here */
void partition(vector <int> ar) {
[Code] .....
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Aug 14, 2014
how to compute the averages for 6 values that have been computed from a for loop,
I mean once the for loop finishes it prints me six different values classified into 3 groups as shown down:
group1 has value1
groupe2 has value2, value3, value3
group3 has value5, value6
I want to find the average for each group.
considering the number of values in each group might change. this is the code for finding the values:
for (int i=0; i<n; i++)
{
if (value < 25)
{
[Code]....
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Jun 20, 2014
I habe a program, that can send and receive UDP Multicast telegrams. When I open the socket then I bind my multicast group address and the local port to a specified networkcard (our PC has 2 network cards). Now I have a special constellation:
Our PC has 2 network cards. Multicast group 1 shall use card 1 and group shall use card 2. As long as both groups use different local ports it works fine. But when both group want to use the same port number then I can receive and send telegrams only through the first group that was created. For the second one I don't even get a FD_READ event at all.
Code:
SrvAddr.sin_family = AF_INET;
SrvAddr.sin_port = htons( (WORD) nLocalPort );
SrvAddr.sin_addr.s_addr = inet_addr(strOwnIpAddress); // bind multicast group socket to a specified networkcard
// If bind socket to port failed
if( bind( hSocket,
[Code] .....
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Jan 26, 2013
You are given 3 integers x,y,z. you must find all groups of x integers until y, that when added give a sum of z.
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Mar 14, 2014
I have an EDI file whose structure is given below. This file has multiple records, each record contains a header (e.g EDI.DD.0000000001.20130809), then contents (i.e multiple paragraphs of text) and then footer (e.g End of Report/No EDI Activity). I have to read that entire file using regular expression using three groups.
I am using following regular expression to read the file.
(?<header>[A-Z]{3}.[A-Z]{2}.[0-9]{10}.[0-9]{8}) | (?<footer> (EndsofsReport|NosEDIsActivity)) |
(?<content>(?<=k<header>).*(?=k<footer>))
That expression reads the "header" and "footer" in respective groups properly but didn't pick the contents between header and footer in "contents" group.
I have changed the font of header and footer in below file to understand the format. I am using asp.net 3.5 framework.
//------------------Start of EDI File---------------------//
EDI.DD.0000000001.20130809
ORIGINATOR INFORMATION Company Name: UNITED HEALTHCAR Identification: 9024125001 Originating DFI: 002100002
RECEIVER INFORMATION Receiver Name: HEALTH & WELLNESS DFI Account Number: 0000000000000001 Receiving DFI ID: 434343430 ID Number: Transaction Type: 22 Deposit
ORIGINATOR INFORMATION Company Nam
[Code] ....
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Aug 31, 2013
I want to make 10 random numbers thus making 10 random flips of a coin. I am getting 10 tails or 10 heads!
Code: #include <iostream>
#include <ctime>
#include <cstdlib>
using namespace std;
int main(int argc, const char * argv[])
{
[Code].....
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Dec 30, 2013
my motive is to get random variable at every start of program.so it does not show same sequence when it run again and again
int main()
{
srand( time ( NULL ) );
cout<<rand();
}
when i run this program in code::block the following program is opening with error in new tab called TIME.H
/*
* time.h
* This file has no copyright assigned and is placed in the Public Domain.
* This file is a part of the mingw-runtime package.
* No warranty is given; refer to the file DISCLAIMER within the package.
*
* Date and time functions and types.
*
*/
#ifndef_TIME_H_
#define_TIME_H_
[Code]....
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Nov 26, 2014
I've been working on a little experiment, here is the source: [URL]
The problem that I keep running into is when I run the initPop and generate an individual object, the genome of the next individual is _exactly_ the same as the previous one... which confuses me... Shouldn't each individual be randomly different from the one that preceded it? What am I not right when it comes to generating random values?
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Dec 11, 2014
I got this program:
#include <iostream>
#include <string>
#include <fstream>
#include <iomanip>
#define N 10
using namespace std;
class custo{
[Code] .....
And its working well but the output is:
Last login: Wed Dec 10 19:54:49 on ttys000
/Applications/CodeBlocks.app/Contents/MacOS/cb_console_runner DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:. /Users/Soul/Documents/School/CISC/Assignment10/bin/Debug/Assignment10
Christians-MacBook-Pro:~ Soul$ /Applications/CodeBlocks.app/Contents/MacOS/cb_console_runner DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:. /Users/Soul/Documents/School/CISC/Assignment10/bin/Debug/Assignment10
Barack Obama DC 100 50 300 2000
Bill DeBlasio NY 250 100 80 5000
Kirsten Gillibrand NY 50 100 200 1000
Chris Chrystie CT 100 200 300 5000
Eric Holder DC 50 80 200 1000
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
Process returned 0 (0x0) execution time : 0.006 s
Press ENTER to continue.
Where those 0s come from nor how to get rid of them. I'm also having trouble putting the output in table format but thats just a minor issue.
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Nov 27, 2013
I'm trying to generate random number from 7 to 10 but all i got is "Error C2661: 'rand' : no overloaded function takes 1 argument"
there is my code:
#include "stdafx.h"
#include <iostream>
#include <cstdlib>
#include <time.h>
using namespace std;
void init_Function(); // init function
[Code] .....
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Jan 7, 2015
i want to create an arry with random value. in 50% times the average of this array is upper of 0.5 and in 50% times the average of this array is lower of 0.5 . i want to write this code in C++. but i dont know what the algorithm is.
My code is this.
#include <algorithm>
#include <cstdlib>
#include <iostream>
int main() {
int a[10] = {0, 1, 2, 3, 4, 5, 6, 7,8 ,9};
std::srand(unsigned(std::time(0)));
}
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Nov 11, 2014
When I run this program it always generates the number 41 or 42. Why is this? Even if I add the code
magic = rand()%100 + 1;
to specify a range of 1 to 100 it's still always 41 or 42.
This is exactly the same code my book uses just without the cout << magic statement
#include<iostream>
#include<cstdlib>
using namespace std;
[Code].....
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Oct 26, 2014
#include
#include
#include
int main () {
int gameplays, n, prize, choice1;
[Code]....
So in this code, the user inputs the amount of games he/she wants the program to simulate. For each game, a "prize" is randomly placed in one out of three doors. My problem is that for each game simulated, the prize is always placed in the same door. How do i fix this? I used the stand function but it still doesn't work.
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Oct 23, 2013
i have some mathematics instruction to resolve
|z - c| =< r and|z - w| =< d
Because i want just one number , i used randomise
Code:
mini =min((d-w),(c-r));
maxi=max((d+w),(r+c));
z=mini + (rand()%(maxii - minii));
It give me random number but when i use it to calculate another
Code:
f=sqrt(pow(d,2)-pow((z-w),2));
It give me error because many times the "z"is very height
so i get negative inter the sqrt.how i resolve this problem ? shall i add another limit to the Z?
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Oct 17, 2014
I'm trying to make a C++ program that generate 6 random numbers ( from 100,000 to 999,999 ), okay, so I wrote a few lines..
Code:
srand(time(0));
for (int i = 0; i < 5; i++)
{
std::cout << 100000 + (rand() % 999999) << std::endl;
}
The problem is, that it generates numbers like this:
117,207
123,303
131,083
... etc etc..
They're all starts with 100K, i want them to be an actual random..
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Nov 9, 2014
My program behaves weird... I wanted to generate 10 random numbers from 1 to 100 each of them bigger than previous, using the while loop and function that returns a random number in specified range.
When I run the program, I get numbers much bigger than 100, even negative number, and numbers are same every time I run the program.
Code:
#include <ctime>#include <cstdlib>
#include <iostream>
using namespace std;
int range(int low, int high);
[Code] .....
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Mar 27, 2014
When the number is guessed correctly the program doesn't print "You guessed right" ....
Code:
#include"stdafx.h"
#include<iostream>
#include<cstdlib>
#include<ctime>
#include<string>
usingnamespace std;
[Code] ....
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Oct 19, 2014
I have a program that generates random numbers. After the random number is generated, the program asks if you want to generate another random number. However, if you generate another random number, it is always the same as the first random number. How can I fix this?
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Mar 17, 2013
I'm trying to generate random numbers so that I can assign people to teams. So far I have come up with this
Code:
int generateTeam(){
int i, teamNumber, c, n;
for (c = 0; c <= 5; c++) {
n = rand()%100 + 1;
}
[code]....
}//end generateTeam I'm not sure how to make it so that I can exclude the previous random number when generating the next one. As an example, I have 22 students and I get the number 19. Now I can't have 19 again because that guy already has it.
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Oct 15, 2014
I'm trying to write a program that generates a random number between 50 and 200. I made a program that generates random numbers, but how to make those random numbers be in-between 50 and 200. Any example of a program that generates random numbers that are confined in-between certain values?
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May 9, 2014
What I'm trying to do is to have the program pick random people for different jobs. The user enters the number of people, then, enters both jobs and the people's names. I need the program to pick random people, but randomly pick again if the person has already been picked, so, no repeats. I have the program picking random people, but I can't get it to not pick the person again. I'll run it and there will be no errors, but it's almost like Xcode completely bi-passes the for/if to check if it's picked the person already.
Below is the code.
#include <iostream>
#include <math.h>
using namespace std;
int main() {
int runagain=0, correctnames=0, versiondesciosion=0, correctjobs=0;//vars that make descisions for running again
rerun:
[Code] ....
Dont look at the "fun" version for the switch statement. It's not ready yet, I'm just having trouble with the random thing.
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Apr 14, 2013
i have to find 2 random values between a range, lets say from 0-3 i have to find all the possible combinations between this range like (0,0),(0,1)...etc But, it has to be RANDOM and the same combination cannot repeat it self(obviously).
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Mar 18, 2014
//VALID:
const int CONSTANT=100;
int integerArray[CONSTANT]={ 0 };
//but after getting input let's say:
cin>>randomInteger;
int integerArray[randomInteger]; // This is invalid.
// VISUAL STUDIO 13 Says : randomInteger must be a constant; If so?
const int CONSTANT=randomInteger; //This is also invalid.
How to get user defined
//Input in a constant variable?
How to resolve this? I know dynamically allocation other than this.
I am using VISUAL STUDIO 13 ....
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