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一次AC，我的算法，大家参考参考将P转换为01序列，0代表“（”，1代表“）” 遍历序列，查到1后回溯，遇到0，则将0变为2，并停止回溯； 遇到2，则sum++. 最后把sum存放到另外一个数组即可。 Followed by:
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