BZOJ-2124: 等差子序列
Description 给一个1到N的排列{Ai}，询问是否存在1<=p1< p2< p3< p…
BZOJ-1355: [Baltic2009]Radio Transmission
Description 给你一个字符串，它是由某个字符串不断自我连接形成的。 但是这个字符串是不确定的，现在只想知道它的…
HDU-3336:Count the string
Description It is well known that AekdyCoin is good at strin…
HDU-2752:Seek the Name, Seek the Fame
Description The little cat is so famous, that many couples t…
POJ-2406 Power Strings
Description Given two strings a and b we define a*b to be th…