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f=->*a{a.product([~n=$_.to_i,-1,1,n+1]){|p,d|a|=[p]if$_[p+=d]<?.}!=a ?f[*a]:a.size}
gets(p).scan(/ /){$*<<f[$`.size]}
p$*.max<f[~/X/]

Success #stdin #stdout 0.02s 7456KB

stdin

5
.....
.X. .
. ...
. . .
.....

stdout

true

https://ideone.com/8A8MBD

language:

Ruby (ruby 2.5.5)

created:

visibility:

public

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