Evaluate expression without stack, constant space

Q: Evaluate expression without stack, constant space

This question evaluates a candidate's ability to parse and evaluate arithmetic expressions using constant extra space, covering skills in string parsing, handling multi-digit numbers, operator precedence resolution, integer arithmetic semantics (including truncating division), and in-place algorithm design.

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Question

Given a string s representing a valid arithmetic expression containing non-negative integers, '+', '-', '*', '/', and spaces (no parentheses), evaluate and return its value. Implement a single-pass solution in O(n) time using O(

extra space; you may not use an explicit stack. Division should truncate toward zero. Explain how you handle multi-digit numbers and operator precedence without a stack.

Evaluate expression without stack, constant space

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