摘要：
B -Power StringsTime Limit:3000MSMemory Limit:65536KB64bit IO Format:%I64d & %I64uSubmitStatusDescriptionGiven 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 concatenation as m 阅读全文