Problem 44761. Lights Out 9 - 5x5, light-only solution? II

Created by goc3
Appears in Number Manipulation IV

Difficulty:Rate

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Lights Out is a logic game wherein all lights need to be turned off to complete each board. See the first problem in the series for an introduction.

This problem contains boards that each require any number of moves to solve. The function you write has to determine if the initial state contains a potential answer—i.e., if toggling any given subset of the starting lights is sufficient to solve the board.

Prev.: 5x5, light-only solution? I — Next: 5x5, with wrapping, 6 moves

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23 Solutions
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Last Solution submitted on Feb 21, 2025

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goc3 on 2 May 2019

It has been updated.

Nikolaos Nikolaou on 26 Mar 2020

Test suite has crashed again plz fix

goc3 on 28 Mar 2020

@ Nikolaos: are you sure it's the test suite and not a server error? If you get the following message, it is due to a temporary server problem, not a specific problem: "While evaluating the solution, the server encountered an error caused by temporary unavailability of MATLAB Service. Wait a few minutes for the MATLAB Service to return, and then rescore." If you are getting this error, simply try the problem again later or on a different day.

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Number Manipulation IV

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