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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
void swap(char *a, char *b);
void permute(char *s, int l, int r);
unsigned long long fact(int n);
const char red[] = "\033[31m";
const char white[] = "\033[37m";
const char norm[] = "\033[0m";
int main(int argc, char **argv) {
if (argc != 2) {
printf("%scmb%s>%s at least give me a string :(\n", red, white, norm);
return 1;
}
char warn = 'n';
char *str = strdup(argv[1]);
unsigned long long iter_num = fact(strlen(str));
printf("%scmb%s>%s iteration count: %ld! = %llu\n", red, white, norm, strlen(str), iter_num);
if (strlen(str) >= 6) {
printf("%scmb%s>%s warning, your string is %ld characters long.\n", red, white, norm, strlen(str));
printf("%scmb%s>%s the output %s*will*%s be %shuge%s, continue? (y/n)\n? ", red, white, norm, red, norm, red, norm);
scanf(" %c", &warn);
if (warn == 'n') {
printf("%scmb%s>%s quitting gracefully..\n", red, white, norm);
free(str);
return 1;
}
}
printf("%scmb%s>%s ", red, white, norm); // without \n -> prints the given string, *wink* *wink* :)
permute(str, 0, strlen(str) - 1);
free(str);
return 0;
}
void swap(char *a, char *b) {
char tmp = *a;
*a = *b;
*b = tmp;
}
void permute(char *s, int l, int r) {
if (l == r) {
printf("%s\n", s);
return;
}
for (int i = l; i <= r; i++) {
swap(&s[l], &s[i]);
permute(s, l + 1, r);
swap(&s[l], &s[i]);
}
}
unsigned long long fact(int n) {
return (n <= 1) ? 1 : n * fact(n - 1);
}
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