CCF的习题
201912-1:已做，用时（2020/7/05）2：13
201912-2:已做，用时（2020/7/06）3：39
202012-3:已做，用时（2020/7/08） 9小时（给的输入样例全部正确，但只拿到了90分）
201909-1：已做（2020/7/18），用时 0：40
201909-2：已做（2020/7/18），用时 1：30（给的输入样例全部正确，但只拿到了90分）
201909-3：傻屌题
201903-1：已做（2020/8/10），用时1：28（没注意题目要求，不能整除的要求保留1位小数）
201903-2：已做（2020/8/11），用时2：30（搞不明白为什么只有50分）
201812-1：已做（2020/8/12），用时0：20
201812-2：已做（2020/8/12），用时1：27
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