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There is something missing (Posted on 2005-05-13) Difficulty: 3 of 5
This popular Japanese number puzzle has just one easy rule: In every Row, every Column and every 3x3 sub-grid, all the numbers from 1 to 9 should appear, but only once in each row, column and sub-grid.
+------+-------+------+
| 0 0 0 | 7 0 0 | 4 0 0 |
| 0 3 0 | 0 9 0 | 0 2 0 |
| 4 0 0 | 0 0 5 | 0 0 0 |
+------+-------+------+
| 0 0 8 | 0 0 0 | 0 0 5 |
| 0 9 0 | 0 3 0 | 0 7 0 |
| 6 0 0 | 0 0 0 | 3 0 0 |
+------+-------+------+
| 0 0 0 | 4 0 0 | 0 0 6 |
| 0 7 0 | 0 2 0 | 0 9 0 |
| 0 0 5 | 0 0 8 | 0 0 0 |
+------+-------+------+

Replace the 0's with the digits required to satisfy the rule.

See The Solution Submitted by Hugo    
Rating: 4.4000 (10 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Thanks... | Comment 22 of 29 |

Thanks, Hugo, for a fun one--I rated it a 5. 

Nikki, nice job on your manual solution.  I actually tried to solve it that way, but ran out of patience after deducing 3 squares and staring at the remainder for an hour.

The programming exercise was fun...it was an eye-opener for me to see how fast VB.Net is, compared to the older Microsoft Basic languages.  Compiling to native code certainly makes a difference.  Thanks to Penny and Charlie for the feedback.

Ken


  Posted by Ken Haley on 2005-05-17 03:31:09
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