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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. #define N 15
  6. char           *s, *w;
  7. int             n;
  8.  
  9. void
  10. placement(int x)
  11. {
  12.   int             i;
  13.   char            t;
  14.  
  15.   if (x == 0) {
  16.     for(i=0; i<n-1; i++) {
  17.       printf("%c,", w[i]);
  18.     }
  19.     printf("%c\n", w[i]);
  20.     return;
  21.   }
  22.   for (i = n; i; i--) {
  23.     if (s[i - 1] == ' ')
  24.       continue;
  25.     w[x - 1] = s[i - 1];
  26.     t = s[i - 1];
  27.     s[i - 1] = ' ';
  28.     placement(x - 1);
  29.     s[i - 1] = t;
  30.   }
  31. }
  32.  
  33. int
  34. main(int argc, char **argv)
  35. {
  36.   n = atoi(argv[1]);
  37.   s = malloc(sizeof(char) * (N + 1));
  38.   strncpy(s, "abcdefghijklmno", n);
  39.   w = malloc(sizeof(char) * (N + 1));
  40.   strcpy(w, s);
  41.   placement(n);
  42.  
  43.   return 0;
  44. }
Runtime error #stdin #stdout 0.02s 1716KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/D1qik
language:
C (gcc 8.3)
created:
11 years ago
visibility:
secret

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