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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.)
re(4): Haley's Comet vrs. Penny's Loafer: And the winner is.... | Comment 19 of 29 |
(In reply to re(3): Haley's Comet vrs. Penny's Loafer: And the winner is.... by Ken Haley)

When I change that 7 to a zero in my QuickBasic program it takes 7 minutes 21 seconds to find 82 solutions.
  Posted by Charlie on 2005-05-16 14:10:44

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