Sunday, July 8, 2007

Write a C program generate permutations.

Iterative C program


#include < stdio.h >
#define SIZE 3
int main(char *argv[],int argc)
{
char list[3]={'a','b','c'};
int i,j,k;

for(i=0;i < SIZE;i++)
for(j=0;j < SIZE;j++)
for(k=0;k < SIZE;k++)
if(i!=j && j!=k && i!=k)
printf("%c%c%c\n",list[i],list[j],list[k]);

return(0);
}



Recursive C program


#include < stdio.h >
#define N 5


int main(char *argv[],int argc)
{
char list[5]={'a','b','c','d','e'};
permute(list,0,N);
return(0);
}


void permute(char list[],int k, int m)
{
int i;
char temp;

if(k==m)
{
/* PRINT A FROM k to m! */
for(i=0;i < N;i++){printf("%c",list[i]);}
printf("\n");
}
else
{
for(i=k;i < m;i++)
{
/* swap(a[i],a[m-1]); */
temp=list[i];
list[i]=list[m-1];
list[m-1]=temp;

permute(list,k,m-1);

/* swap(a[m-1],a[i]); */

temp=list[m-1];
list[m-1]=list[i];
list[i]=temp;
}
}
}

60 comments:

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Anonymous said...

The recursive answer has some extraneous stuff in it. You'll note that the 2nd param to permute() will always be 0. So, you really don't need it. Then the check to print it out will be if ( m == 0 )

shery said...

how to write a c++ program to generate all the permutations of a number using stack.

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kingsley said...

Right code in C++(Kingsley Sithole):

#include "stdafx.h"
#include
#include

using namespace std;

void ReverseString(char *left, char *right)
{
char text;
while (left < right)
{
text = *left;
*left = *right;
*right = text;
++left;
--right;
}
}

void ReverseWords(char *Reverse)
{

char *start = Reverse;
char *stop = Reverse;
while (*stop != '\0')
++stop;
--stop;

ReverseString(start, stop);

while (*start != '\0')
{

for ( ; *start != '\0' && *start == ' '; start++);

for (stop = start; *stop != '\0' && *stop != ' '; stop++);
--stop;
ReverseString(start, stop);
start = ++stop;
}
}
int main (int argc, char * const argv[]) {

char Sentence[200] ;
cout<<"Enter Sentence:"<<endl;
cin.getline(&Sentence[0],'0');
cout << "Before Reversal = '" << Sentence<< "'" << endl;
ReverseWords(Sentence);
cout << "After Reversal = '" << Sentence<< "'" << endl;

return 0;
}

Gauz said...

Code in Java

public class Test{
public static void main(String []args)
{
permute("dog");
}

private static void permute(String str)
{
int length = str.length();
boolean used[] = new boolean[length];
StringBuffer out = new StringBuffer();
char[] in = str.toCharArray();

doPermute(in, out, used, length, 0);
}

private static void doPermute(char[] in, StringBuffer out, boolean []used, int length, int level)
{
if(level == length)
{
System.out.println(out.toString());
return;
}

for(int i = 0; i < length; i++)
{
if(used[i])
continue;
out.append(in[i]);
used[i] = true;
doPermute(in, out, used, length, level+1);
used[i] = false;
out.setLength(out.length()-1);
}
}
}

Anonymous said...

void perm(char *str,int start, int end){

int i;
char temp[256];
strcpy(temp,str);
if(start == end){
printf("%s\n",str);
}else{
for(i = start; i <= end; i++){
if(str[i] != str[start])
str[i]^= str[start]^= str[i]^=str[start];
perm(str,start+1,end);
}
strcpy(str,temp);
}
}

subburajr said...

the one which I tried
oid perm(char *str,int start, int end){

int i;
char temp[256];
strcpy(temp,str);
if(start == end){
printf("%s\n",str);
}else{
for(i = start; i <= end; i++){
if(str[i] != str[start])
str[i]^= str[start]^= str[i]^=str[start];
perm(str,start+1,end);
}
strcpy(str,temp);
}
}

Anonymous said...

Good post, adding it to my blog now, thanks. :)

Jasonjin said...

Can anyone explain the algorithm of this recursive permutation?

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