# Problem Definition

## Description

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

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

### Examples

```plaintext
["2", "1", "+", "3", "*"] -> ((2 + 1) * 3) -> 9
["4", "13", "5", "/", "+"] -> (4 + (13 / 5)) -> 6
```

## Notes

1. [ProgramCreek](https://www.programcreek.com/2012/12/leetcode-evaluate-reverse-polish-notation/)
1. [LeetCode discussion](https://leetcode.com/problems/evaluate-reverse-polish-notation/discuss/47430)