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Bit filling in 5*5 grid! (Posted on 2019-04-26) Difficulty: 4 of 5
There is a 5×5 grid in front of you. You have to fill 25 squares with only 0 and 1.

But, every pair of neighboring squares (that is not diagonally adjacent) needs to have a product equal to 0.

How many possible grids are there?

No Solution Yet Submitted by Danish Ahmed Khan    
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One more thought..... Comment 3 of 3 |
(In reply to computer solution by Charlie)

I notice the bottom right corner never has a 1 in Charlie's 37 examples. Could the program have retraced back before trying to put a "1" in this spot?


Yes, that's it - if I don't count the ones with a 1 in the corner I only get  37869  like Charlie. 


Edited on April 30, 2019, 2:36 am
  Posted by Steven Lord on 2019-04-29 22:54:08

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