Implement regular expression matching with support for '.' and '*'.
'.' Matches any single character.
'*' Matches zero or more of the preceding element.
The matching should cover the entire input... 查看全文
You are given a string expression representing a Lisp-like expression to return the integer value of.
The syntax for these expressions is given as follows.
An expression is either an integer, a let... 查看全文
Given a string representing arbitrarily nested ternary expressions, calculate the result of the expression. You can always assume that the given expression is valid and only consists of digits 0-9,... 查看全文
About the Cron Expression
Cron is use in Linux for the time schedule
Seconds Minutes Hours DayofMonth DayofWeek [Year]The value of each row
, - * ... 查看全文