Question
Evaluate an integer arithmetic expression string containing non-negative integers, single- or multi-letter variable names, the operators `+ - * /`, parentheses, and arbitrary spaces. A dict maps each variable name to an integer value. Standard precedence applies (`* /` before `+ -`), `/` is integer division truncated toward zero, and the input is well-formed. Return the integer result.
eval_with_vars(expr: str, varmap: dict) → int["a + b * 2",{"a":3,"b":4}]out11State 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.