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  1. #include <stdio.h>
  2.  
  3. char list[10];
  4.  
  5. void show(int n) {
  6.     printf("(%c", list[0]);
  7.     for (int i = 1; i < n; i++)
  8.         printf(",%c", list[i]);
  9.  
  10.     printf(")\n");
  11. }
  12.  
  13. void Swap(int k, int i) {
  14.     int temp = list[k];
  15.     list[k] = list[i];
  16.     list[i] = temp;
  17. }
  18.  
  19. void Perm(int k, int n) {
  20.     if(k == n) {
  21.         show(n);
  22.     } else {
  23.         for(int i = k; i < n; i++) {
  24.             Swap(k, i);
  25.             Perm(k + 1, n);
  26.             Swap(i, k);
  27.         }
  28.     }
  29. }
  30.  
  31. int main(void) {
  32.     int num;
  33.  
  34.     scanf("%d", &num);
  35.  
  36.     for(int i = 0; i < num; i++)
  37.         list[i] = '1' + i;
  38.     Perm(0, num);
  39.  
  40.     return 0;
  41. }
  42.  
Success #stdin #stdout 0s 9424KB
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()
https://ideone.com/LvwbVq
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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