README_EN.md

150. Evaluate Reverse Polish Notation

中文文档

Description

Evaluate the value of an arithmetic expression in Reverse Polish Notation.

Valid operators are +, -, *, /. Each operand may be an integer or another expression.

Note:

<li>Division between two integers should truncate toward zero.</li>

<li>The given RPN expression is always valid. That means the expression would always evaluate to a result and there won&#39;t&nbsp;be any&nbsp;divide&nbsp;by zero operation.</li>

Example 1:

Input: ["2", "1", "+", "3", "*"]

Output: 9

Explanation: ((2 + 1) * 3) = 9

Example 2:

Input: ["4", "13", "5", "/", "+"]

Output: 6

Explanation: (4 + (13 / 5)) = 6

Example 3:

Input: ["10", "6", "9", "3", "+", "-11", "*", "/", "*", "17", "+", "5", "+"]

Output: 22

Explanation: 

  ((10 * (6 / ((9 + 3) * -11))) + 17) + 5

= ((10 * (6 / (12 * -11))) + 17) + 5

= ((10 * (6 / -132)) + 17) + 5

= ((10 * 0) + 17) + 5

= (0 + 17) + 5

= 17 + 5

= 22

Solutions

Python3

Java

...