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Warm-up
The Reverse Calculator
You are given a mathematical expression in Postfix notation (Reverse Polish Notation) containing only non-negative integers and two operators: '+' and '-'. In Postfix, the operator follows its operands (e.g., '3 4 +' means 3 + 4). Process the expression and print the final result. You can assume the expression provided is always valid.
Example:
Input: 10 5 - 3 +
Output: 8
Key concepts
stackarithmetic
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