题目描述
例如，对于括号序列 ((()，只需要添加两个括号就能让其合法，有以下几种不同的添加结果：()()()、()(())、(())()、(()()) 和 ((()))。
输入格式
右括号。
输出格式
样例输入
((()
样例输出
5
提示
比赛公告
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