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# 第13回オフラインリアルタイムどう書くの参考問題をRubyで解く

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http://qiita.com/Nabetani/items/89fb0e2e712d4b396535

```def solve(q)
target = q.to_i
done = {0=>0}
cur = [0]
(1..target).each{|nest|
nxt = []
cur.each{|num|
if done[num - 1].nil?
done[num - 1] = nest
nxt << num - 1
end
if done[num + 1].nil?
done[num + 1] = nest
nxt << num + 1
end
if done[num * 2].nil?
done[num * 2] = nest
nxt << num * 2
end
}
return nest if nxt.include?(target)
cur = nxt
}
-1
end

no,q,a,*s = line.chop.split(/\s+/)
ans = solve(q)
print no + "\t" + ans.to_s
puts ans == a.to_i ? ' o' : ' x'
end
__END__
0   59  9    +1 ×2 ×2 ×2 ×2 -1 ×2 ×2 -1
1   10  5    +1 +1 ×2 +1 ×2
2   11  6    +1 ×2 ×2 +1 ×2 +1
```
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