Introduction - If you have any usage issues, please Google them yourself
Were used to sequence the table and a single list as the storage structure, completed: (1) to achieve a linear form (a0, a1, a2, a3, ..., an-1) in situ reverse set operation. (2) to achieve an x into a list L in increasing order and make an ordered list L remains. (3) The realization of statistics in an input string of different characters in the frequency of emergence.