第三屆中國計量大學ACM程序設計競賽我的賽（同步賽）——L

連接：https://ac.nowcoder.com/acm/contest/5795/L 來源：牛客網 題目描述 One day, Little Gyro was playing with a series of Bracket Sequences, A Bracket Sequence is a string that only contains two kinds of characters

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