Power StringsTime Limit: 3000MSMemory Limit: 65536KTotal Submissions: 14072Accepted: 5890<br />DescriptionGiven two strings a and b we define a*b to be their concatenation. For example, if a = "abc" and b = "def" then a*b = "abcdef". If we think of concate

PeriodTime Limit: 3000MSMemory Limit: 30000KTotal Submissions: 6019Accepted: 2556<br />DescriptionFor each prefix of a given string S with N characters (each character has an ASCII code between 97 and 126, inclusive), we want to know whether the prefix is