Codeforces Round #697 (Div. 3)
本文共 837 字，大约阅读时间需要 2 分钟。
??A???n?????1?????
???????n?????1?????????????????
????2??n????2?????????? ??????????????1?????????n???????????1????n????1?????? ???
- ??n=28???2?????7?7????????1??????YES??
- ??n=16???2?????1?1????1?????????NO??
??B???n??????x?2020?y?2021??
?????????????n???????x?2020?y?2021???
?????????????x?y??????????????????n? ???????x?????????????x???y??????????????n? ???
- ??n=4040?x=2?y=0????4040??????YES??
- ??n=4041??????????x?y??????NO??
??C???????????????
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?????????????????????????? ???????????????????????????????????? ???????????????????????????????? ???
- ?????[1, 1, 2, 1]
- ?????[1, 4, 1, 1]
- ????????(1,1), (1,4), (2,1), (1,1), (2,4), (1,1)
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