2019-2020 ICPC, Asia Jakarta Regional Contest (Online Mirror, ICPC Rules, Teams Preferred)
2019-2020ICPC,AsiaJakartaRegionalContest(OnlineMirror,ICPCRules,TeamsPreferred)easy:ACEGHKmedium-easy:BJLmedium:D?????:IA.B.C.对\(R[],C[]\)分别按奇偶性分段。网!D.考虑check一个串,枚举右走对应的前缀pre,下走对应的后缀suf。把每行反串拼接中间连特殊字符