Question
Evaluate an arithmetic expression string containing non-negative integers, the binary operators + - * /, and parentheses. Standard precedence applies (* and / bind tighter than + and -); operators of equal precedence are left-associative. Division is integer division that truncates toward zero (like C). There may be spaces between tokens. The expression is always valid and contains no unary minus. Return the integer result. Assume no division by zero.
evaluate(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.