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Solution: Evaluate Reverse Polish Notation
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Problem Statement

Given an array of strings tokens that represents an arithmetic expression in Reverse Polish Notation (RPN), evaluate the expression and return the resulting integer value.

  • The valid operators are '+', '-', '*', and '/'.
  • Each operand can be an integer or another expression.
  • Division between two integers should truncate towards zero.
  • No division by zero will occur.
  • The input is a valid RPN expression.
  • All results fit within a 32-bit integer.

Examples

Example 1

  • Input: tokens = ["2", "11", "5", "/", "+"]
  • Output: 4

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