http://oj.leetcode.com/problems/evaluate-reverse-polish-notation/ According to the wiki page, the algorithm for evaluating any postfix expression is fairly straightforward. The following is the pseudo-code for evaluating a postfix expression. while there are input tokens left read the next token f...
The algorithm for evaluating any postfix expression is fairly straightforward: While there are input tokens left Read the next token from input. If the token is a value Push it onto the stack. Otherwise, the token is an operator (operator here includes both operators and functions). It is kn...
Notation),如:"+ - A * B C D",转换成中缀表达式为:"A - B * C + D";后缀表达式(Postfix Notation),比如前所述的中缀表达式转换为后缀表达式为:"A B C * - D +"。为了纪念波兰数学家鲁卡谢维奇(Jan Lukasiewicz),前缀表达式被称作波兰表达式,后缀表达式称为逆波兰表达式(Reverse Polish Notation)。
Postfix notation is a notation for writing arithmetic expressions in which the operands (numbers) appear before their operators. For example, the postfix tokens of the expression4*(5-(7+2))are represented in the arraypostfix = ["4","5","7","2","+","-","*"]. The classNodeis an ...