Problem: Evaluate Reverse Polish Notation
Explore how to evaluate arithmetic expressions formatted in Reverse Polish Notation by using a stack data structure. Understand how to process operators and operands sequentially to compute the expression's integer result efficiently. Learn the step-by-step procedure for implementing this approach and analyze the time and space complexity involved.
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Statement
You are given an array of strings tokens representing a valid arithmetic expression in Reverse Polish Notation (RPN). Your task is to evaluate the expression and return an integer representing the value of the expression.
Note: The valid operators are
'+','-','*', and'/'.
Each operand may be an integer or another expression.
Division between two integers always truncates toward zero.
There will not be any division by zero.
The input is guaranteed to represent a valid arithmetic expression in Reverse Polish Notation.
The answer and all intermediate calculations can be represented in a‑bit integer.
Constraints:
tokens.length...