leetcode笔记:Evaluate Reverse Polish Notation(逆波兰式的计算)
一.题目描述EvaluatethevalueofanarithmeticexpressioninReversePolishNotation.Validoperatorsare+,-,*,/.Eachoperandmaybeanintegeroranotherexpression.Someexamples:["2","1","+","3","*"]->((2+1)*3)->9["4","13","5