Codeforces Round #657 (Div. 2)——B. Dubious Cyrpto题解
2020/7/20题目:Pashalovestosendstrictlypositiveintegerstohisfriends.Pashacaresaboutsecurity,thereforewhenhewantstosendanintegern,heencryptsitinthefollowingway:hepicksthreeintegersa,bandcsuchthatl≤a,b,c≤r