How to Solve Evaluate Reverse Polish Notation Problem
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Evaluate Reverse Polish Notation
You are given an array of strings tokens that represents an arithmetic expression in a Reverse Polish Notation. Evaluate the expression. Return an integer that represents the value of the expression. ...
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Understanding the Evaluate Reverse Polish Notation Problem
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Problem Statement
You are given an array of strings tokens that represents an arithmetic expression in a Reverse Polish Notation. Evaluate the expression. Return an integer that represents the value of the expression. Note that: The valid operators are '+', '-', '*', and '/'. Each operand may be an integer or another expression. The division between two integers always truncates toward zero. There will not be any division by zero. The input represents a valid arithmetic expression in a reverse polish notation. The answer and all the intermediate calculations can be represented in a 32-bit integer.
Evaluate Reverse Polish Notation
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Examples
tokens = ["2","1","+","3","*"]9((2 + 1) * 3) = 9
tokens = ["4","13","5","/","+"]6(4 + (13 / 5)) = 6
tokens = ["10","6","9","3","+","-11","*","/","*","17","+","5","+"]22((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 <= 104tokens[i] is either an operator: "+", "-", "*", or "/", or an integer in the range [-200, 200].How Interview Coder Helps with Leetcode Problems
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