第三届中国计量大学ACM程序设计竞赛我的赛（同步赛）——L

连接：https://ac.nowcoder.com/acm/contest/5795/L 来源：牛客网 题目描述 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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