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コメントを受けて追記
answer
CHANGED
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@@ -12,4 +12,21 @@
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]
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p gr_a.inject(&:&).max_by{|x| gr_b.select{|y| y.include?(x)}.size}
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```
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#修正後の問題
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```Ruby
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require "date"
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gr_a = [
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["2018/02/18","2018/02/19","2018/02/20","2018/02/24"],
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["2018/02/18","2018/02/19","2018/02/20","2018/03/1"],
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]
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gr_b = [
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["2018/02/18","2018/02/19","2018/03/05"],
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["2018/02/22","2018/02/19"],
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["2018/02/18","2018/02/23"] ,
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]
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p gr_a.inject(&:&).sort_by{|x| [-gr_b.select{|y| y.include? x}.size,Date.parse(x)]}.first
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```
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