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  1. #include <stdio.h>
  2.  
  3. int div3(int x){
  4. 		const int t[]={0,0,0,1,1,1,2,2,2,3};
  5. 		//int y = (x>>2) + (x>>4) + (x>>6); // max error is 12 of done one-line
  6. 		int y = (x>>2) + (x>>4);
  7. 		y+=y>>4;
  8. 		int b = x - (y<<1) - y;
  9. 		y+=(t[b]);
  10. 		return y;
  11. }
  12.  
  13. int main(void) {
  14. 	for(int i=0;i<=255;i++){
  15. 		int y = div3(i);
  16. 		if(y!=i/3){
  17. 			printf("%d vs %d at %d\n", y, i/3, i);
  18. 		}
  19. 	}
  20. 	return 0;
  21. }
  22.  
Success #stdin #stdout 0s 5520KB
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https://ideone.com/HZIstv
language:
C (gcc 8.3)
created:
1 year ago
visibility:
secret

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