phase[classno] = 2;
习题链接：LeetCode 496. 下一个更大元素 I
，详情可参考搜狗输入法下载
* @param n 数组长度
Cold emails are mostly sales emails that are sent with content align to the needs of the recipient. It is usually personalized and includes a business perspective. However, it is still an unsolicited email. And all unsolicited emails are marked as SPAM.
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