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- ary = []
- # 入力値を配列へセット
- while line = gets
- ary.push(line.chomp.to_i.abs)
- end
- # グループ化してキーが値が一つの要素を除外し重複した数を出力
- p ary.group_by{|i| i}.reject{|k,v| v.one?}.keys.count
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