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", "*"]…

Question 150. Evaluate Reverse Polish Notation Solution 2 1 + 3 * 是((2+1)*3)的后缀(postfix)或逆波兰(reverse Polish)记法,计算这个表达式容易想到栈,当见到一个数时就入栈,见到操作符时该运算符作用于从该栈中弹出的两个数上,将所得结果入栈. public int evalRPN(String[] tokens) { Stack<Integer> stack = new Stack<>()…

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", "*"] -&g…

原题链接:https://oj.leetcode.com/problems/evaluate-reverse-polish-notation/ 题目大意:给出逆波兰式,然后求其结果. 解题方法:单个栈 思路:遍历逆波兰式,若为数字.则入栈.若为操作符.则弹出栈顶的2个元素,然后将其相应该操作符的结果入栈.遍历完毕后,栈中元素就是所求结果. 时间复杂度:O(N)  空间复杂度 : O(1) class Solution { public: int evalRPN(vector<string> &…

150. 逆波兰表达式求值 150. Evaluate Reverse Polish Notation 题目描述 根据逆波兰表示法,求表达式的值. 有效的运算符包括 +, -, *, /.每个运算对象可以是整数,也可以是另一个逆波兰表达式. 说明: 整数除法只保留整数部分. 给定逆波兰表达式总是有效的.换句话说,表达式总会得出有效数值且不存在除数为 0 的情况. 每日一算法2019/5/27Day 24LeetCode150. Evaluate Reverse Polish Notation 示…

LeetCode: Reverse Words in a String:Evaluate Reverse Polish Notation 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&q…

Evaluate Reverse Polish Notation 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", "+",…

[LeetCode]150. Evaluate Reverse Polish Notation 解题报告(Python) 标签: LeetCode 题目地址:https://leetcode.com/problems/evaluate-reverse-polish-notation/description/ 题目描述: Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operator…

Evaluate Reverse Polish Notation 题目描述: 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", "+"…

Evaluate Reverse Polish Notation 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", "+",…