Problem: Evaluate Reverse Polish Notation
Explore how to use a stack to evaluate arithmetic expressions given in Reverse Polish Notation. Understand how to process tokens sequentially, apply operators to operands stored in the stack, and return the computed result. This lesson helps you grasp the practical application of stacks in expression evaluation and improves your problem-solving skills in data structures.
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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.lengthtokens[i]is either an operator:"+","-"...