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 Lights Out! (2) (Posted on 2022-10-31)
Imagine there is a 7x7 grid of lights, and only the middle in the grid is on.

The lights are wired such that when you flip the switch for one light (from on to off or off to on) the others next to it (not diagonally) flip as well.

Using this weird wiring of lights, what is the fewest number of switch changes it takes to turn all the lights off, and which lights should you switch?

Note: Assume all the switches work in the manner explained, and there is one switch for each of the lights.

 See The Solution Submitted by K Sengupta Rating: 5.0000 (1 votes)

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 re(4): extension of the problem -- 13 and 15 | Comment 8 of 24 |
(In reply to re(3): extension of the problem by Charlie)

```size  13
0  1  1  1  0  1  1  1  0  1  1  1  0
1  0  1  0  0  0  1  0  0  0  1  0  1
1  1  0  0  0  0  0  0  0  0  0  1  1
1  0  0  0  0  0  1  0  0  0  0  0  1
0  0  0  0  0  1  1  1  0  0  0  0  0
1  0  0  0  1  0  0  0  1  0  0  0  1
1  1  0  1  1  0  1  0  1  1  0  1  1
1  0  0  0  1  0  0  0  1  0  0  0  1
0  0  0  0  0  1  1  1  0  0  0  0  0
1  0  0  0  0  0  1  0  0  0  0  0  1
1  1  0  0  0  0  0  0  0  0  0  1  1
1  0  1  0  0  0  1  0  0  0  1  0  1
0  1  1  1  0  1  1  1  0  1  1  1  0

65

size  15
0  0  0  0  0  0  0  1  0  0  0  0  0  0  0
0  0  0  0  0  0  1  1  1  0  0  0  0  0  0
0  0  0  0  0  1  0  0  0  1  0  0  0  0  0
0  0  0  0  1  1  0  1  0  1  1  0  0  0  0
0  0  0  1  0  1  0  1  0  1  0  1  0  0  0
0  0  1  1  1  0  0  0  0  0  1  1  1  0  0
0  1  0  0  0  0  0  1  0  0  0  0  0  1  0
1  1  0  1  1  0  1  1  1  0  1  1  0  1  1
0  1  0  0  0  0  0  1  0  0  0  0  0  1  0
0  0  1  1  1  0  0  0  0  0  1  1  1  0  0
0  0  0  1  0  1  0  1  0  1  0  1  0  0  0
0  0  0  0  1  1  0  1  0  1  1  0  0  0  0
0  0  0  0  0  1  0  0  0  1  0  0  0  0  0
0  0  0  0  0  0  1  1  1  0  0  0  0  0  0
0  0  0  0  0  0  0  1  0  0  0  0  0  0  0

61```

Edited on November 11, 2022, 2:04 pm
 Posted by Charlie on 2022-11-11 14:02:56

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