Codeforce Round #538(Div2)

比赛链接:https://codeforces.com/contest/1114

B.（字丑求轻喷QAQ）

标签：QAQ,contest,codeforces,丑求,Codeforce,https,Div2,538
来源： https://www.cnblogs.com/codeoosacm/p/10374135.html