I have multiplied two 3-digit numbers and coded the whole process twice:

In the 1st coding O replaces an odd digit and E the even.

   OOO
 * EOE
  OEOE
  OOO
 OEE  
 OOOEE 

In the 2nd coding S replaces a digit smaller than 6 and B a digit bigger than 5.

   SBB
 * SSB
  SSSB
  SSS
 BSB  
 BBSSB

Try to get my original numbers(digit 9 does not appear in the multiplication) and all other possible solutions, if any.

(In reply to re: Not that hard (spoiler)-Ady reverts by Ady TZIDON)

I hope I didn't offend.  It's a fine problem, Ady.  Thanks.  I was just afraid that people might have been afraid to tackle it on account of the rating, and I wanted to encourage others to tackle it.

Posted by Steve Herman on 2011-06-10 13:19:37