C/C++ :: Find All Permutations Of A List
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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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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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 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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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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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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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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Apr 27, 2013
i have to make a program where a user inputs one number and i have to find the number of a certain amount of number in the program.
for example:
user input: 2349354787839
output: There are two sevens
i know it has the use of loops but i am having trouble finding a way to scan each individual digit in the input to find if it is a seven or not.
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Feb 9, 2014
I'm have troubles with this program that requires me to make a search through a Linked List and find a specified value. It also needs to be a template function. I've completed the rest of the program fine and everything runs ok except for the search function. Code below:
Linked.h
#ifndef LINKED_H
#define LINKED_H
#include<iostream>
template <class T>
class Linked {
[Code] ....
I have commented out my attempt at the search function. When uncommenting the function I get several errors about <template> being incorrect syntax.
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Jan 7, 2014
I am very much new to C programming. However, I have an assignment regarding linked list.
Problem Statement is: Using linked list store the coordinates of four cartesian points and then find the coordinates having longest distance from its origin.
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Mar 8, 2013
I have a text file that needs to be read by command line arguments. The text are all numbers and can have multiple numbers on one line separated by a space. I cannot use an array or sort the numbers.So say I have a text file, listNums.txt:
12
473 8 29
30 1
8
248 17 55
29 84
5
Basically I need to read one number, find out if its odd or even by dividing by 2, search the odd or even doubly linked list that it would go into to see if its in there, if its not then add it to the bottom of the list.
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Mar 18, 2013
im using a for loop to find the index values of the tied high scores and store them into string list then reference list in the second for loop to output it to screen however it isnt letting me use an array with index i as an index its self.
void printHighest(Student s[], int length){
int index;
string list[10];//you're never going to have more than 10 people with a tieing highscore.
index = findMax(s, length);
[Code] ....
For the time being I simply removed the idea of string list and just put the contents of the second for loop into the if statement above it. However, I am still curious as to if I can reference an index of an array in an index of another array.
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Jan 18, 2015
I'm trying to write a simple program that finds the minimum difference between two pairs of integers in a list/array. Of no surprise, it not work the first time I ran it so naturally i chucked in a whole bunch of print statements to debug
I encountered a peculiar error that is really stumping me.
#include <iostream>
using namespace std;
int closest_pair(int arr[]) {
int i=0;
int j=0;
int size=0;
int min=0;
[Code] .....
OUTPUT:
size_main: 20
arr_main: 80
arr[0]_main: 4
size: 2
arr: 8
arr[0]: 4
0: 34
1: -12
2: 18
3: 61
19: 75
closest_pair: 0
I'm printing the size of the array in main and inside the function...and inside the function its giving me a size = 2 which is incorrect though the size printed in main is correct (size = 20). I further narrowed down the discrepancy to this statement: sizeof(arr)
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Apr 23, 2013
From HP / Microsoft (Visual Studio C++) <list>:
Code:
struct _Node
{ // list node
_Genptr _Next; // successor node, or first element if head
_Genptr _Prev; // predecessor node, or last element if head
_Ty _Myval; // the stored value, unused if head
};
The stored value is wasted space for the list head. Is there any advantage to implementing list using the same structure for a list head and node?
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Dec 31, 2014
Code:
// Write a function called insertEntry() to insert a new entry into a linked list.
Have the procedure take as arguments a pointer to the list entry to be inserted (of type struct entry as defined in this chapter), and a pointer to an element in the list after which the new entry is to be inserted.
// The function dveloped in exercise 2 only inserts an element after an existing element in the list, thereby prenting you from inserting a new entry at the front of the list.
(Hint: Think about setting up a special structure to point to the beginning of the list.)
#include <stdio.h
struct entry1 {
int value;
struct entry1 *next;
};
[code]...
This is a working version of the exercise, but I don't think I'm doing what's asked. I was able to add an element to the beginning of the list using an if statement, not creating a special structure that points to the beginning of the list. How would I go about creating a special structure that points to the beginning of the list to add a new element at the beginning of the list?
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Jan 20, 2015
I'm trying to display a list of MSMQ messages in a list box based on a drop-down list holding the environment.So i've setup the binding and i know that the list loads but nothing shows up in the list? I should be setting like a display member or something but i'm not entirely sure
const String msmqAccelaDev = "FormatName:DIRECT=OS:tcc-intsrvTCCIntegration.MSMQ.Service.Dev/TCCMessagingService.svc";
const String msmqAccelaProd = "FormatName:DIRECT=OS:tcc-intsrvTCCMSMQFail";
const String msmqAccelaTest = "FormatName:DIRECT=OS:tcc-intsrvTCCIntegration.MSMQ.Service.Test/TCCMessagingService.svc";
String currentQueue = "";
private void environmentChange()
[Code]...
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May 30, 2013
I'm working on a linked list and was wondering how this looks to everybody else for a deleteList function.
void deleteList(Node* head)
{
Node* iterator = head;
while (iterator != 0)
[code].....
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Mar 11, 2013
I need to find S and how did you find S in N is 4
#include <iostream>
int main () {
int n,i,s;
cout<<"Put the number of n"<<endl;
cin>>n;
s=0
for (i=1;i<=n;i++)
s=s+i
cout<<"S is<<s<<endl;
return 0
}
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Jun 29, 2013
I have a linked list comprised of chars like so...
Code:
node1 - "p"
node2 - "o"
node3 - "p"
I need a function that will take in three perameters...node *replaceChar(node *head, char key, char *str)Stipulations of this function. head is the head of the list, 'key' and 'str' are guaranteed to contain alphanumeric characters only (A-Z, a-z, and 0-9). str can range from 1 to 1023 characters (inclusively). So if I call this function with these perameters..
Code:
node *head == /*the head of the list to be examined*/
char key == "p"char *str == "dog"The new list will look like this...
node1 - 'd'
node2 - 'o'
node3 - 'g'
node4 - 'o'
node5 - 'd'
node6 - 'o'
node7 - 'g'
All instances of 'p' were replaced with 'dog' I have a toString function which takes in a string and converts it to a linked list and returns the head. So assume that you can call the function on str = "dog" so...
Code:
toString(str) == /*this will return the head to the list made from the str*/
If it's unclear what my question is...I am stumped on how to write the replaceChar function the one that takes in three perameters..
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Aug 20, 2013
I'm a beginner in C and system programming. I need to use multiple process and POSIX shared memory to find all primes between 0 and 100. My code compiles, but the result is not correct, it shows all the multiples of 3 as primes.My instructor also mentioned that the multi-process portion will fork() the appropriate number of child processes. The parent process will create a POSIX shared memory object to which the sub-processes will attach. I am confused about the things he said about parent process.why I'm not getting the right primes?
Code:
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/mman.h>
[Code]....
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Mar 16, 2013
I just got assigned a project in my C programming class. The objective is to find the min and max number out of a .txt file full of numbers on separate lines called "data.txt". I am pretty much stuck at this point. I don't know how to actually scan the file and print the min and max. Also, the list of numbers in the data.txt file contains hundred on hundreds of numbers. So I couldn't specify the exact amount of numbers listed in the file. I must also find the count number, sum, and the average of the given data, So far I have:
Code:
#include<stdio.h>
int main()
{
int counter=0;
int maximum=0, minimum=1;
int num_data_points, avg;
double max, min;
FILE *sensor;
sensor = fopen("data.txt", "r");
[Code]...
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Aug 3, 2012
This is the first time I'm trying to program in C# and I'm having some trouble.I can't find a way to compile whatever I do.I don't think it's a problem of what I wrote but I might not have what is necessary.I tried: C:>csc fisrt.cs csc was not a valid command.
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Oct 20, 2013
I am working on a homework lab in which we have to find all the subsets equal to a given sum from an array of numbers.For example, an array of 7 numbers (1, 3, 4, 6, 7, 10, 25) with a sum of 25 would be (1, 3, 4, 7) and (25)...We are supposed to use dynamic programming to solve this.Now using the code below that we went over in class (Sedgewick's subsetSum), I understand how to this finds the first subset that adds up to the sum given. What's stumping me is how to find multiple subsets.
Code:
main(){
// Get input sequence
int n; // Size of input set
int m; // Target value
int *S; // Input set
int *C; // Cost table
int i,j,potentialSum,leftover;
}
[code]....
In class the teacher said it would be mainly just modifying the code we went over in class.
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Jun 9, 2014
when I try to run the program (new to VC++, I click the green arrow next to "Debug" in the toolbar, right) and I get a message box - code builds without errors - but the debugger says: "Unable to start program 'c:users/sal/documents/visual studio 2010/Projects/SFML App/Debug/SFML App.exe Cannot find file specified"...well, I go to the directory it says, and nothing is even in the Debug file.
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Dec 2, 2013
how to get this program to find the palindrome? Here is my program:
#include <iostream>
#include <string>
using namespace std;
using std::string;
[code].....
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