Created
December 29, 2015 08:48
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// C program to print all permutations with duplicates allowed | |
#include <stdio.h> | |
#include <string.h> | |
/* Function to swap values at two pointers */ | |
void swap(char *x, char *y) | |
{ | |
char temp; | |
temp = *x; | |
*x = *y; | |
*y = temp; | |
} | |
/* Function to print permutations of string | |
This function takes three parameters: | |
1. String | |
2. Starting index of the string | |
3. Ending index of the string. */ | |
void permute(char *a, int l, int r) | |
{ | |
int i; | |
if (l == r) | |
printf("%s\n", a); | |
else | |
{ | |
for (i = l; i <= r; i++) | |
{ | |
swap((a+l), (a+i)); | |
permute(a, l+1, r); | |
swap((a+l), (a+i)); //backtrack | |
} | |
} | |
} | |
/* Driver program to test above functions */ | |
int main() | |
{ | |
char str[] = "ABC"; | |
int n = strlen(str); | |
permute(str, 0, n-1); | |
return 0; | |
} |
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code snippet (C++) for generating the permutation of a given string