C++ :: Permutation Combination With Range Of N
Aug 10, 2013
#include <iostream> // std::cout
#include <algorithm> // std::next_permutation, std::sort
int main () {
int myints[] = {1,2,3};
std::sort (myints,myints+3);
std::cout << "The 3! possible permutations with 3 elements:
[Code] ....
this will result
123
132
213
231
312
321
The question is : If I want to get a permutation combination with range of N
What should i do?
if N = 2
result should be 12,13,21.....such and such
Eliminate the last digit is working for 3 combination but if its going to a bigger number it does not work ...
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Nov 7, 2013
I got a permutation question, I got two different std::list:
list<string> slist;
slist.push_back("str111");
slist.push_back("str222");
slist.push_back("str333");
list<int> ilist;
ilist.push_back(100);
ilist.push_back(200);
I need the permutation for both two lists, the result should be like this:
#include <iostream>
#include <string>
#include <list>
#include <algorithm>
using namespace std;
template <typename value_t>
void dump_list(const list<value_t>& lst) {
[Code] ....
See, there are two do while loop, if I need a permutation with more than two lists, there'll be more and more do-while loops, that's make code looks ugly, I wonder if stl has some tricky way that can do this with just one next_permutation.
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Jan 29, 2015
I need to be able to find every possible permutation using all possible values of a char. But I have to make it be able to form permutations from a length of 1 to variable N. For example, if N=3, I need it to be able to come up with
0x00
0x01
.......
0x00 0x00
0x01 0x01
.......
0xff 0xff 0xfe
0xff 0xff 0xff
How could I do this. (I would like to avoid recursion, since N might be as large as 50 or 60 and using recursion would most likely cause a stack overflow)
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May 11, 2013
I wrote this code to solve a problem in which the user inputs a permutation of size 'N' and the next permutation of the same elements has to be generated.
I went about this in this way: given 3 2 5 4 1, starting from the right, the first no. has to be searched which has a no. greater to it on its right. Here it is 2. Now an array is generated containing all no.s on its right and greater than it. For 2, it is: 5,4. Out of these the smallest member is searched for and switched with 2. So, 4 is switched with 2 to get the Next Permutation: 3 4 5 2 1.
The code I wrote does not show any error but does not return the correct value when run and gives the same value instead. If I enter '3 2 5 4 1' it returns the same value as the answer.
#include<iostream.h>
#include<conio.h>
void main() {
clrscr();
int N,M,i,n,c,swap,flag,count,small,m;
int Array[100],Key[100];
[Code] .....
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Jan 17, 2015
I need to create such a function that the content of the first is put into the second, the content of the second into the third and the content of the third into the first.
For example, output should be like this
3
2
1
But the code below prints out:
1
2
2
Where am I making a mistake?
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <ctype.h>
[Code]....
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Jul 8, 2014
This part of the code i suppose to get generate all possible combination of number and numbers and combination can't repeat. There 6 set of numbers the first 5 can't repeat, here is what I have so far. Its not efficient and is time consuming for my PC. probably will take upto 10 minutes to complete.
Code:
void Gen2(int limit){
FILE *fPtr;
struct Ticket set;
struct Ticket nSet;
struct Ticket checkSet;
int pass;
[Code] .....
The repeatCheck function returns the correct value but is just repeats constantly.
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Feb 16, 2013
I'm currently working on assignment which requires to generate a random permutation of the first N integers. For example, if N = 4, one possible answer is {3,1,2,4} without duplicates. {3,3,2,4} is not correct
to fill a[4], generate random numbers until you get one that is not already in a[0], a[1], ..., a[n-1]. for a[0] whatever random number you generate can be put in it. So here is my code. It seem to works but sometime it give duplicates.
#include <iostream>
#include <stdlib.h>
#include <time.h>
[Code].....
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Aug 10, 2013
For example let say there is vector [1,2,3,4,5,6,7,8,9] and let say there is int n
if i say n=3
I want to find all possible 3 combination
[1,2,3][1,2,4].....such and such
if i say n=4
[1,2,3,4][1,2,3,5]......
I want to know how you write the code depend on the input n. Is it call dynamic programming?
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Jul 24, 2012
ShAltGr+A represents a foreign character in a font set.
How to make a CString variable for this so it can be displayed in a text editor programmatically?
Typing the combination of course works.
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Mar 27, 2014
I have been given an assignment that has to do with permutations. I am suppose to read a text file that contains the permutation rules and the text to be "permutated", and then output the rules and the new text into an output file.
So far, I've gotten this:
Code:
# include <stdio.h>
void printArray(FILE* file, char* array, int maxSize)
{
int i;
for (i = 0; i<maxSize; i++)
fprintf(file, "%c", *(array + i));
[Code] ....
Here is what the input file looks like:
Code:
0 1 2 3 4 5 6 7 8 9
4 5 6 0 9 7 8 1 2 3
Moderation in temper, is always a virtue; but moderation in principle, is a species of vice.
Here is what the output file is suppose to look like:
Code:
0 1 2 3 4 5 6 7 8 9
4 5 6 0 9 7 8 1 2 3
ratMnioodetem rpein al,ywa isvirsetu a t m;eod
buon r inaticipp,lerina s cpeis of icvies - Temho.
-ainaPes
The first two lines are the permutation rules. Currently I have figured out how to read the file into an array and then print it back out into a text.
What I want to do is figure out how to read only the first two line of the input file and store that as a permutation rules, and then continue reading the rest of the input file and store that separately as the text to be "permutated". And then eventually figure out how to apply the permutation to the text.
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Feb 16, 2014
I need to create a function with the following prototype:
bool isPermutation( const unsigned a[], unsigned elements );
unsigned a[] = {3, 0, 2, 1};
bool P1 = isPermutation( a, 4 );
would set P1 to true because the set of subscripts is {0, 1, 2, 3}, and the values are just a reordering of those values. On the other hand,
unsigned a[] = {3, 0, 2, 3};
bool P2 = isPermutation( a, 4 );
would set P2 to false because the set of subscripts is {0, 1, 2, 3}, but there’s no value that’s equal to 1.
I'm not exactly sure how to do this. I thought about it a couple different ways. I first thought about taking the range (max/min) and then checking to see if the numbers in between are equal from each other, distance-wise.
I then thought that I should just make this basically a sort function (I used bubble-sort), and then to just check if the numbers are equi-distant from each other.
This is my basic bubble-sort. Perhaps it is wrong, but I'm not certain...Perhaps I am making this function harder than it has to be.
unsigned temp = 0;
for (unsigned i = 0; i < elements; i++){
for (unsigned k = 0; k < elements-1; k++){
if (a[k] > a[k+1]){
temp = a[k+1];
a[k+1] = a[k];
a[k] = temp;
}}}
Should I do a sort like this, and then do something where I subtract a[i+1] - a[i], and see if that equals '1'?. I would think that would mean they would have to be equidistant. Even if this is correct, I feel like it could be more efficient.
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Mar 21, 2014
Write a function that computes and returns the score for a permutation, i.e. the number of reversals required to make arr[0] == 1.
HAVE TO USE FOLLOWING FORMAT:
Code:
// POST: Returns the number of reversals needed to make arr[0] == 1
// if the reversal game were played on arr
// Note: If arr[0] == 1 initially, then score(arr, n) returns 0 AND this is what i could muster;
[code]....
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Nov 22, 2013
I have been struggling with this program. I am somewhat new to c and suck at logic. I have a personal program I want to make that I will try to get extra credit for in school. I have a printed set of winning lottery numbers form the last 10 years. I chose the easiest one do do logically which is just 5 numbers none repeating.
I am trying to find out how I can print the least common 10 sets. I think if there are any set which have not been picked I would have to print all of those because logically they would all be equal, then print sequentially the sets least picked up to 10.
I have pseudocode which I am sure is wrong but will post it just to show that I am trying. My first attempt was to add the numbers but quickly realized that that wouldn't work ...
5 Nums Pseudocode
Code:
Read Nums
Parse Into Ints
Make Array [185] //39+38+37+36+35 The highest the numbers added together can go
//LOGIC
[Code] ....
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Feb 23, 2014
Suppose I have to take "100" from the string "1001", whats the process to do it?
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Jan 1, 2014
Im about to program a RPG and, of course, the player has got an inventory. The items in this inventory are stored in a linked list and have IDs in form of strings.
player.cpp: (just the most relevant)
#include <list>
#include <string>
using namespace std;
[Code] ....
Of course, when the player saves the game, the inventory has to be saved too.
game.cpp(just the m. R.)
#include <fstream>
using namespace std;
class CGame{
[Code] .....
Now, in my code I write the linked list into the file savegames.sav
void CGame::save(CPlayer* player){
m_out.open("savegames.sav", ios::out);
m_out.write((char* ) &player->m_inventory, sizeof(player->m_inventory));
m_out.close();
}
In another function i load the list:
void CGame::load(CPlayer* player){
m_in.open("savegames.sav", ios::in);
m_in.read((char* ) player->m_inventory, sizeof(player->m_inventory));
m_in.read();
}
And when i access the loaded linked list with the .empty() function or so, Windows says the following:
<Mygame.exe> funktioniert nicht mehr (in English: doesnt run anymore).
I tried so much to fix that but i dint reach my aim.
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Jul 15, 2013
I have N vectors which look like this:
[1→m] [m+1→2m] [2m+1→3m] [3m+1→4m] [4m+1→5m]..... [{(N-1)m}+1→Nm]
I want to select 1 element from each vector without duplication of any combinations. Essentially only when all combinations are done with 1st element in first vector ,only then it should move to next element in first vector.
Say i have elements :[123] [456] [789]
my combinations should be like
147
148
149
157
158
159
167
168
169
247....
Also, I cant have any repetitions and only after all combinations of 1 are done only then the loop has to move to next combination ie 247 combination and so on.
I tried NCK (n choose k) command but it gave me random combinations. How should i go about it with using minimal for loops?
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Mar 24, 2013
I'm trying to write a recursive function that takes in a vector of strings that contains
"1 forward", "2 forward", "rotate left", "2 backwards" ... etc
how can I write recursive function that creates a vector of every unique combination of commands?
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Oct 10, 2014
I want to read a string of unknown length from stdin. I tried to follow the approach from this link.
[URL]....
My code is like this:
Code:
#include <iostream>
#include <string>
using namespace std;
int n;
cin >> n;
cout << "The value of n is " << n << endl;
string str;
getline(cin, str);
cout << "The entereed string is " << str << endl;
What I have noticed is that if I take integer input from cin (cin >> n in the above code before getline, the control does not stop on getline to take str as input from the console. If I don't do (cin >> n) before getline then the control stops on getline and takes the string as input.
What is the best way to read from console multiple strings of unknown length in combination with the integers?
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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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Nov 23, 2013
What the range of values and how to calculate them?
int Num = rand() % 350 + 13 / 10
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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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Feb 17, 2013
I have an assignment where I have to use two for loops. I need to ask the user for any two numbers and be able to list all the numbers in between and their factors and state whether or not the number is prime or not.
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Feb 16, 2014
In Particular:
N3337 wrote:86) this ensures that a top-level comma operator cannot be reinterpreted as a delimiter between init-declarators in the declaration of __range.
What in the world would be a valid example of when this might occur? (IE one that isn't blatantly misusing the quirks of the language).
This topic can also serve as a review topic on this presentation as well: [URL] .....
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Nov 3, 2013
I've been debugging this program since yesterday and I continue to run into a string subscript error. I pasted the code in a pastebin (it's only 400 lines), to see why I'm getting this. The problem seems to come up during a debug assertion failure.
[URL] ....
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Feb 26, 2014
whenever I try to use either <string> or any STL container. Everyone I saw so far, says that "using a .reserve(n)" before adding items to random positions is enough. However, each time I run the code, I still get the same error, unless I actually write the memory with some initial data, and only after access random positions.I am fully aware of the fact that the STL containers and <string> are dynamic data types and memory allocation is done dynamically. However, if I need to allocate all those memory slots before knowing how many I need, would lead me to the same memory complexity as using a char [] array (which is static -- size declaration at first).
how is it possible to keep the <string> dynamic, while being able to add elements on random positions (if possible). I know the strings have the ending char '', but there should still be something that would allow it to work. Okay, long story short, here is my example. I am trying to read from file rows of data. The first char on each row represents a normal char c. The rest of the row is a string which contains numbers (integers between 1 and 250) which represent the position at which the char c (read before) will have its location.
For example the input file:
#include <fstream>
#include <deque> // for later use
#include <string>
#include <sstream>
#include <algorithm> // for later use
[code].....
The program works perfectly, if instead of text.reserve(250); I use text.resize(250);. However, what is the difference between the two? I mean, why isn't reserve enough?
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Aug 18, 2014
I keep getting this "Debug Assertion Failed" error that says:
expression: vector subscript out of range
I tried to make the loop the same as the vector size, but I'm still getting the same errors.
void Grid::output(ostream & out) {
vector<vector<int>> grid(4);
int rows, columns;
out << " 0 1 2 3 " << endl;
out << " +---------+" << endl;
for( rows=0; rows<grid.size(); ++rows ) // make each row
[code]....
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