Leetcode Çözümleri – Evaluate Reverse Polish Notation

Leetcode içerisinde bulunan “Evaluate Reverse Polish Notation” sorusunun açıklaması ve çözümü. Bu soruda size verilen bir “reverse polish notation”‘ın sonucunu geriye döndürmeniz isteniyor.

➡️ Reverse Polish Notation nedir? https://en.wikipedia.org/wiki/Reverse_Polish_notation

➡️ LeetCode 150. Evaluate Reverse Polish Notation: https://leetcode.com/problems/evaluate-reverse-polish-notation/

➡️ Problem açıklaması:

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

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

Note that division between two integers should truncate toward zero.

It is guaranteed that the given RPN expression is always valid. That means the expression would always evaluate to a result, and there will not be any division by zero operation.

Example 1:

Input: tokens = [“2″,”1″,”+”,”3″,”*”]

Output: 9

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

Example 2:

Input: tokens = [“4″,”13″,”5″,”/”,”+”]

Output: 6

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

Example 3:

Input: tokens = [“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

Constraints:

1 <= tokens.length <= 10^4

tokens[i] is either an operator: “+”, “-“, “*”, or “/”, or an integer in the range [-200, 200].

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