All Questions
Tagged with lights-out logical-deduction
3
questions
10
votes
1
answer
1k
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How do I determine whether a 5x5 Lights-Out puzzle is solvable without trying to solve it?
The following two 5x5 Lights-Out puzzles are not solvable. Is there a way to find out why, without trying to solve them?
[1, 0, 0, 1, 0]
[1, 1, 1, 1, 0]
[1, 1, 1, 0, 0]
[0, 0, 1, 0, 0]
[1, ...
- 201
6
votes
3
answers
1k
views
Flipping coins in a circle
We have a set of N coins that are all placed in a circle. They all have "Tails" as their face up side. The coins are all distinct and have numbers (1,2,3...N) written on them.
In each move, ...
- 3,383
3
votes
1
answer
172
views
Fill 5 x 5 grid
In each cell of a 5 × 5 square there is a token that is black on
one side and white on the other. Initially all tokens are placed
with the white side facing up. On each move three tokens in
...
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