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  1. #include <stdio.h>
  2. #include <math.h>
  3. void hanoi_tower(int n, char from, char tmp, char to)
  4. {
  5. 	if( n==1 ) printf("%c %c\n",from,to);
  6. 	else {
  7. 		hanoi_tower(n-1, from, to, tmp);
  8. 		printf("%c %c\n",from, to);
  9. 		hanoi_tower(n-1, tmp, from, to);
  10. 	}
  11. }
  12. int main(void)
  13. {
  14. 	int i;
  15. 	scanf("%d",&i);
  16. 	printf("%d\n",(int)pow(2,i)-1);
  17. 	hanoi_tower(i, '1', '2', '3');
  18. 	return 0;
  19. }
Success #stdin #stdout 0s 5312KB
comments (?)
stdin 
3
stdout 
7
1 3
1 2
3 2
1 3
2 1
2 3
1 3
https://ideone.com/UhJAoR
language:
C (gcc 8.3)
created:
14 days ago
visibility:
public

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