摘要：
Time Limit: 3000MS Memory Limit: 30000K Total Submissions: 18043 Accepted: 8742 Description For each prefix of a given string S with N characters (eac 阅读全文
摘要：
UVALive - 3942 Remember the Word Neal is very curious about combinatorial problems, and now here comes a problem about words. Knowing that Ray has a p 阅读全文