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友人-A:
博客地址:https://www.cnblogs.com/Friends-A/
Codeforces 888E:Maximum Subsequence(枚举,二分)
Codeforces 855B:Marvolo Gaunt's Ring(枚举,前后缀)
Codeforces 872B:Maximum of Maximums of Minimums(思维)
Codeforces 876B:Divisiblity of Differences(数学)
Codeforces 450E:Jzzhu and Apples(构造,数学)