【Codeforces Round #518 (Div. 2)】

A:https://www.cnblogs.com/myx12345/p/9847588.html

B:https://www.cnblogs.com/myx12345/p/9847590.html

C:https://www.cnblogs.com/myx12345/p/9850705.html

D:https://www.cnblogs.com/myx12345/p/9851785.html

E:

F:

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