C++ :: How To Generate All Permutations Of Objects Present On List
Mar 13, 2014
I've a big problem. I'd like to generate of all permutations of objects present on my list and i don't know how to do this. I've found a few examples, but i can't use them in my code...
#include <iostream>
#include <string>
#include <list>
#include <fstream>
#include <cstddef>
#include <cstdlib>
#include <iterator>
using namespace std;
class Item {
private:
[Code]...
Input file with objects:
3
2 0 0 4
5 0 1 5
3 0 2 6
and output should be:
2 0 0 4
5 0 1 5
3 0 2 6
2 0 0 4
3 0 2 6
5 0 1 5
3 0 2 6
2 0 0 4
5 0 1 5
etc... 3! so 6 permutations for this example.
I was 'fighting' with this for few days, and I'm so downcast.
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Dec 5, 2013
I know how to generate all permutations of a list like: {'h','e','k','p'}
But I am needing to know how to generate all permutations like: {{'a','b'}, {'h','k','d'}, ..... } such that the first character is either an 'a' or a 'b' and the second character is one of the three in the second list, etc. There will be less than 600 000 permutations.
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Jul 26, 2014
I am trying to generate some lists of permutations of ints but I can't make std::next_permutation work for me. The problem is I need to include permutations which don't use every number. For example take the array of numbers [1, 2]. I need an algo that will return:
1
2
12
21
Must work with up to 8 numbers.
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Apr 3, 2012
I need to find all the possible permutations of a list and I am completely stumped. The specification for the function is:
void allPerms(intListType *toOrigList, intListType *answer)
where *toOrigList is a pointer to a list and *answer is an array of lists. intListType has several member functions and I will post them if you want them, but for the most part they are barely used in this function (which is not a member function). I'm having trouble outputting the permutations because the program keeps crashing. I cannot change the specification of the function. Anyway, here is what I have of the function so far:
#include "allPerms.h"
#include <string>
#include <cstddef>
#include <iostream>
using namespace std;
void allPerms(intListType *toOrigList, intListType *answer)
//Pre: list is not empty
//Post: computes all permutations of a given list
[Code] ....
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Nov 17, 2014
Is there any way to generate random types I build? I know rand command returns random integers, but I want to create some classes and and a function that will generate randomly 3 objects of the types I have created.
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Jun 9, 2013
I'm trying to solve the following problem:
Given a query, find all possible tokens, i.e. query-splits
Example:
query = New York Hotel
tokens = {New, York, Hotel, New York, New Hotel, ...., New Hotel York, Hotel New York, ...}
Given a query with word count n, the total number of tokens is:
n + n*(n-1) + n*(n-1)*(n-2) + ... + n! (any explicit formula available for this sum?)
Now, I have came across various code snippets to generate permutations for a string, but never for a sentence.
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Sep 23, 2014
So my assignment requires us to write a C program to generate a list of powers of 3 where each output line lists three numbers: k 3k 3‐k
It should look like this (just pretend all the numbers are lined up in their respective columns)
1 0 1.0
3 1 0.333333343
9 2 0.111111112
27 3 0.037037037
81 4 0.012345679
243 5 0.004115226
729 6 0.001371742
2187 7 0.000457247
6561 8 0.000152416
19683 9 0.000050805
This is what I keep getting:
1 0 1.000000000
3 1 0.333333343
9 2 0.111111112
27 3 0.037037037
81 4 0.012345679
243 5 0.004115226
729 6 0.001371742
2187 7 0.000457247
6561 8 0.000152416
19683 9 0.000050805
My input:
Code:
#include <stdio.h>
#include <stdlib.h>
void powers(void) {
int i=0;
int n=9;
int x=1;
float h=1;
[Code] .....
Notice how I'm getting 1.000000000 for my first h value in my output whereas I should be getting 1.0. What am I doing wrong?
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Jun 25, 2014
I need to create a list of all members of a struct using the sturct definition as input. The struct is NOT part of the program, but is the input to the program.
The struct that I am using changes over time as features are added. I need the complete, fully qualified field names to then generate a table with all names with their offsets, type and length.
This information then allows me to create readers of the data that will run on different architectures, compilers and operating systems.
The struct currently has 800+ lines and uses typedef and embedded structs.
Perhaps this could be done creating LEX, YACC, Perl, SED, AWK or other language system.
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Oct 24, 2013
I am just starting out programming and have an assignment due in the near future. the problem is I cant seem to figure it out. I started it already but got stuck cant seem to figure it out. Here is the assignment.
Create a program that will generate a list of 200 random numbers (ranging from 1-1000) and determine the medium, mode, and average of the list of numbers. Have the program display the original list ant then display the list in ascending and descending order on the screen.
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Apr 14, 2014
I have a data structure defined up here called this:
typedef list <classSpec*> ClassSpecList;
I'm trying to add stuff into the list here based on functions that return certain values of that match the same data type. In one function, I have a list pointer object defined here and I have another statement that calls a function.
ClassSpecList *answer = 0;
classSpec *thisanswer = parseClass(br);
Basically I'm trying to add the results of what thisanswer returns into my main ClassSpecList. Problem is, when I try
answer->push_back(new classSpec (*thisanswer));
It compiles but I get a seg fault
When I try somethign else like:
answer->insert(ClassSpecList.begin(), *thisanswer);
I keep getting primary expression errors and I do not know why. I even tried it with other list made without typedef and I still get those.
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Feb 10, 2014
I have a standard linked list in template format (with T being the typename) with the following relevant insertion operators:
bool PushFront (const T& t); // Insert t at front of list
bool PushBack (const T& t); // Insert t at back of list
I want to build a list of pointers to objects (we'll call them objects of class Box for simplicity) that is member data for a parent class (we'll call that class Warehouse). However, I want to have a constant Box....const Box INVISIBLE_BOX = Box(); that represents a nonexistent Box. However, I cannot use either
PushFront(&INVISIBLE_BOX)
or
PushBack(&INVISIBLE_BOX)
to add INVISIBLE_BOX to the list of boxes without getting an invalid conversion error invalid conversion from âconst warehouse::Box*â to âwarehouse:: Box*â [-fpermissive]
What can I do to make it take a constant Box? I am using g++ to compile these files.
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May 18, 2014
Main
#include <iostream>
#include "item.h"
#include "inventory.h"
#include <stdlib.h>
#include <string.h>
#pragma GCC diagnostic ignored "-Wwrite-strings"
[code]....
what I would want to happen is is have my item increment in size/count instead of a new object. How would you handle this algorithmically.
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Oct 20, 2014
I am having an issue with the below error saying that there is no data present for the second read item (bold and underlined).
But I can see in the data that both fields have data in them. why the approver2 variable is not being populated?
Error : An unhandled exception of type 'System.InvalidOperationException' occurred in System.Data.dll
Additional information: Invalid attempt to read when no data is present.
C#
string approver = null;
string approver2 = null;
con.Open();
string Approve = "Select Approver"+
",Approver2"+
" From dbo.Tbl_Overview"+
" Where RequestID = '" + STAR.Globals.Detail + STAR.Globals.DetailNum + "'";
[Code] ....
SQL
Select Approver,Approver2 From dbo.Tbl_Overview Where RequestID = 'CR4'
Results
ApproverApprover2
User.1 User2
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Dec 26, 2014
We are considering a word C containing only lowercase. An anagram of the word C is a word formed by the letters of C in another order eventually. E.g.
'armata' is an anagram of the word 'tamara'
but 'maree' is not an anagram of the word 'amare'
A word is an angram of itself.
Determine the number of different anagrams that a word has. Because this number may be very high, there will be posted its decomposition into prime numbers
The input file anagrame.in contains the word C.
The output file anagrame.out will contain the decomposition into prime numbers of the number of anagrams of the word C. On each line there will be a prime factor followed by one space and then its multiplicity(power). The factors will be written in ascending order.
0 < the length of the word <= 1000
e.g
anagrame.in
amar
anagrame.out
2 2
3 1
anagrame.in
informatician
anagrame.out
2 7
3 4
5 2
7 1
11 1
13 1
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Oct 15, 2012
there is a file contains only a numbers ,we dont know how many numbers present in that file.so i want a program to display top n largest number present in that fie.(n may be 5,10,12 like that.)
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Apr 4, 2013
Code: Obj<TCHAR>* obj = dynamic_cast<Obj<TCHAR>* >(I->objects[0]);
Which is resulting in this error
Code: A dynamic cast is present, but the correct RTTI option is not specified.
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Feb 8, 2013
I have been trying to write a recursive function to print the permutations of a n-digit number. This is the logic that i am trying to use.
1.call the permutation function,
2.keep the first digit in the first place and send the remaining 2 digits back to the permutation function recursively.
3.keep one of the two digits received and send the remaining digit to the permute function.
4. keep doing this till only one digit remains. this is the smallest solution so return it.
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Jun 12, 2014
I can't seem to figure out the algorithm to find the right permutation(s) of operands and operators.
We basically have a list of 6 unsigned integers. Using arithmetic operations (addition, subtraction, multiplication, division), find the arithmetic expression that evaluates to a target integer.
Example:
myIntegers = {3, 7, 8, 10, 50, 100};
trgtInt = 315;
Solution is (50 + 10) * 7 - 100 - 8 + 3
We also have the following conditions:
1) Each number from the list can be used only once, but does not have to be used. i.e an expression with 5 or less numbers is acceptable
2) Operators can be used multiple times
I am thinking a parenthesis-free notation like Polish or Reverse Polish notation should be used.
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Apr 25, 2014
I am reading a file whick looks like following:
Code:
10 = NAND(1, 3)
11 = NAND(3, 6, 5)
15 = NAND(9, 6, 2, 8)
Problem: I have to find the word "NAND" and then find the numbers inside the brackets because they are the inputs to that NAND gate. I have written a code below but that code can detect the fixed number of inputs. I need a code which can detect any number of inputs (whether 2 inputs or more than two). But i don't understand how do i do that?
My code:
Code:
string input_str ("INPUT"), output_str ("OUTPUT"), nand_str("NAND");
while (getline( input_file, line ))
{
std::size_t guard_found = line.find(guard_str);
[Code].....
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Apr 19, 2013
I have a list of objects that I need to read information from each object to compare to a user input prompt.
#include "Passenger.h"
#include "Reservation.h"
#include "Aircraft.h"
#include <iostream>
#include <fstream>
#include <string>
#include <list>
using namespace std;
//Function Prototypes
void flightRoster(list<Reservation>&);
[Code] ....
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Jun 11, 2013
This is my program, for now it is intended to compute permutations of any string entered, but the function ox will not return the final x value. ox is the function that actually computes the permutations so the return of the x value is critical.
Code:
#include<stdio.h>
#include<string.h>
int ox(int x);
int main() {
int x;
char input[10];
[Code] .....
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Feb 12, 2013
I'm writing a program that stores records into a file and then these records can be printed out. A last name, first name, and score is stored to be exactly 36 characters long (using leading spaces to pad) making it easier to retrieve specific records. For example, three records stored in the file would like like this: (the underscores are simply to illustrate the distance, they are not in the file itself)
_______lastname_______firstname__90__________lname __________fname_100___________last___________first __60
When printed out, the names are formatted as follows:
lastname, firstname: 90
lname, fname: 100
last, first: 60
However, when I print them out this is what I get:
lastname, firstname: 90
lname, fname: 100$
last, first: 60H
For some reason, for any record after the first, an extra character is added to the end. These characters are not in the file, so I was thinking that the array for some reason wasn't being filled completely, (the array is initialized to size 36 and 36 characters are read from the file using fread) so it was printing out a random character assigned to the 36th array position. Except the character never changes, (always a $ for record 2, H for record 3, l for record 4 if i remember) and I've tried reducing the array size or the number of character read and it's the string that gets altered, the random character always remains. I figure the problem must be in the print_records function (appending seems to work no problem). Anyway here is my print records and appending records code.
Code: /*
- Prints a single record stored in the file pointed to by ifp.
*/
void print_record(FILE *ifp, int record) {
[Code]......
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Nov 12, 2014
This has been bothering me for a while now, and I finally put together an example:
#include <iostream>
#include <string>
using namespace::std;
[Code]....
In the code above, the two classes hold pointers to each other, and that's fine but it doesn't seem right since C++ prefers to pass by reference. Yes, it can still do that (see testbox and testball) but even that seems odd to me because still you need to use pointer notation for the enclosed object. Am I the only one who feels this way, and should I just get over it? Or am I missing something that would allow an object to hold a reference?
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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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Mar 1, 2015
I am a very very beginner at programming with C. Well, basically i have to generate a real number between 0 and 1 (which as the same as from 0 to 100 k and than dividing everything with 100 k).
Why I am constantly talking about 100 k? Because I would need approx 50 000 random numbers between 0 and 1. My code currently looks something like this:
Code:
int main(int argc, char** argv) { int min,max;
double number;
srand((unsigned)time(NULL));
number = 1 + rand()%100;
printf("The number is: %lf",number);
sleep(2);
return (EXIT_SUCCESS);
}
And If I am not mistaken, should generate numbers between 0 and 100. But I can't figure it out how to change to code in order to get enough numbers.
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Nov 20, 2013
Using loops that would generate the same results. I need to use a loop that would make the syntax less lengthy ....
Code:
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<iostream>
float check(float s);
void load(float*);
[Code] .....
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