摘要： 题目： Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, /. Each operand may be an integer or another expression. Some examples: ["2", "1", "+", "3"... 阅读全文

摘要： Given an input string, reverse the string word by word. For example, Given s = "the sky is blue", return "blue is sky the". 整体不是很难。里面java自带的spilt函数就可以将字符串分开。不过在过程中还是未考虑到一些特殊的情况。 比如... 阅读全文