Given string S representing a postfix expression, the task is to evaluate the expression and find the final value. Operators will only include the basic arithmetic operators like *, /, + and -.
Example 1:
Input: S = "231*+9-"
Output: -4
Explanation:
After solving the given expression,
we have -4 as result.
Example 2:
Input: S = "123+*8-"
Output: -3
Explanation:
After solving the given postfix
expression, we have -3 as result.
Your Task: You do not need to read input or print anything. Complete the function evaluatePostfixExpression() that takes the string S denoting the expression as input parameter and returnsthe evaluated value.
Expected Time Complexity: O(|S|) Expected Auixilliary Space: O(|S|)
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Avoid using static/global variables in coding problems as your code is tested
against multiple test cases and these tend to retain their previous values.
Passing the Sample/Custom Test cases in coding problems does not guarantee the
correctness of code. On submission, your code is tested against multiple test cases
consisting of all possible corner cases and stress constraints.
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