比赛地址：https://bbs.huaweicloud.com/forum/thread-29407-1-1.html
>初级赛题：判断输入天数为当年的第几天
·题目介绍
输入一个日期，格式为xxxx-xx-xx，判断这一天为当年的第几天？
·示例
输入：2019-1-2
输出：2
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