#478Medium#34 in Yandex's list· asked at 9 companies
Evaluate Reverse Polish Notation
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What we know
Example 1
Input: tokens = ["2","1","+","3","*"] Output: 9
((2 + 1) * 3) = 9.
Example 2
Input: tokens = ["4","13","5","/","+"] Output: 6
(4 + (13 / 5)) = 6.
Example 3
Input: tokens = ["10","6","9","3","+","-11","*","/","*","17","+","5","+"] Output: 22
Constraints
- •
1 <= tokens.length <= 10^4 - •
tokens[i]is an operator or an integer in the range[-200, 200].