Question
Evaluate a string arithmetic expression containing non-negative integers, the binary operators + - * /, and parentheses, with standard precedence (* and / before + and -) and left associativity. Division is integer division truncating toward zero. The expression may contain spaces. Return the integer result. Assume the expression is valid; length up to a few thousand.
evaluate_expression(expr: str) → int["2+3*4"]out14State your approach and its time/space complexity out loud before you optimize. Handle the edge cases (empty input, duplicates, overflow), and say why you chose this over the brute force. Green tests are the floor, not the grade.
Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.