"Evaluate Reverse Polish Notation" - evaluate an expression given in Reverse Polish Notation.

Publicado em: 27 Dezembro 2023
no canal de: Mastering Programming

"Evaluate Reverse Polish Notation," involves evaluating an expression given in Reverse Polish Notation (RPN).

RPN is a mathematical notation where operators follow their operands.

For instance, in RPN, the expression "2 3 +" is evaluated as 2 + 3.

The problem requires writing a function to evaluate an RPN expression, which involves basic arithmetic operations (+, -, *, /) and assumes valid input.

To solve it, you can use a stack data structure to keep track of operands while scanning the tokens (numbers and operators) of the expression.

When encountering an operand, push it onto the stack; when encountering an operator, pop the necessary operands from the stack, perform the operation, and push the result back onto the stack.

The final result obtained after iterating through all the tokens will be the evaluation of the RPN expression.

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Time Complexity = O(n), where 'n' is the length of the input array

Space Complexity = O(n), where 'n' is the length of the input array

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