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  1. #include <stdio.h>
  2.  
  3. int div3(int x){
  4. 		int y = (x>>2) + (x>>4);
  5. 		y+=y>>4;
  6. 		x=(x-y-(y<<1));
  7. 		y+=((x<<3)+(x<<1)+x)>>5;
  8. 		return y;
  9. }
  10.  
  11. int main(void) {
  12. 	for(int i=0;i<=255;i++){
  13. 		int y = div3(i);
  14. 		if(y!=i/3){
  15. 			printf("%d vs %d at %d\n", y, i/3, i);
  16. 		}
  17. 	}
  18. 	return 0;
  19. }
  20.  
Success #stdin #stdout 0s 5520KB
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https://ideone.com/y5rWch
language:
C (gcc 8.3)
created:
1 year ago
visibility:
secret

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