Problem of the week #2
Well after a reasonable show of interest to problem of the week 1, of which the solution is now posted, this week it shall be an exercise in pure logic. Given the response to that Einstein riddle thing on the front nomadlife page a few weeks ago, I think we will all have more success with this one. It seems that the game of Sudoku has become quite popular recently in a few newspapers around the world, especially London, and so I've taken my problem from this game.
Basically the idea is this: You have a 9*9 grid, which is also divided up into nine 3*3 squares. The idea is to fill in all 81 squares so that every row, every column and each of the nine 3*3 squares all contain the digits 1 through 9. And no row, column or 3*3 square can use a digit twice. Some of the numbers are provided at the start, and these cannot be changed.
Again like last week I am posting an easy version and a hard version. Enjoy :)
The easy version:
The hard version:
Basically the idea is this: You have a 9*9 grid, which is also divided up into nine 3*3 squares. The idea is to fill in all 81 squares so that every row, every column and each of the nine 3*3 squares all contain the digits 1 through 9. And no row, column or 3*3 square can use a digit twice. Some of the numbers are provided at the start, and these cannot be changed.
Again like last week I am posting an easy version and a hard version. Enjoy :)
The easy version:
The hard version:
8 Comments:
Okay, well my friend Roslyn had left a comment that took all the fun out of this problem, and so I have sent her comment off into the vast abyss of cyber-space nothingness.
The challenge here lies in actually completing the puzzle on your own, by hand, something which can still be done even after you see the solution, since the solution gives you no clues as to how to arrive at the solution. Integrity is also called for - if you post an answer, then it should be because you discovered it for yourself :)
Hahahhhaahaha!
Way harsh, dude. I discovered the solution finder by myself, surely that should count for something? Initiative, etc?
Yes Roslyn, it does count for initiative, and it is the sort of approach to solving a problem that does not surprise me coming from you. And I think that's a good thing. So hooray for you.
But of course I don't want to make it easy for other people to do the same. So i said bye-bye to your comment.
I think what I should have done is posted a problem on a grid size different to 9*9. This would make it much more difficult to do by anyway other than hand. Having said that, the take up rate on the 9*9 problem doesn't seem to be too great, so maybe it's a non issue.
*gives roslyn a prize for being net-savvy*
how many solutions are there to the "hard" problem anyways? I found at least 3, but I lost interest shortly after finding this many.
There is only 1 solution. If you have found 3, then I think you have gone wrong somewhere...
Time's up I've decided.
To see the solution for either puzzle (and I assure you all there is only one solution to each puzzle), I shall renew Roslyn's original suggestion and tell you all to just go here, and enter the clues to the puzzle, and click solve.
started PORW #2 today as posted on nomadlife home.
531896247
974321658
682574193
853412976
296758431
147639825
718945362
369287514
425163789
Didn't bother with a solution finder. Went after it myself.
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