Brex Software Engineer Phone Screen Questions

Implement a basic calculator that can perform addition and multiplication based on a string.

## Problem Parse and evaluate algebraic expressions written in English words or natural language form. ## Likely LeetCode equivalent None identified with high confidence. ## Tags coding, strings, parsing, phone

## Problem You are given a list of transactions `(account_id, timestamp, amount)`. Flag any account where the total transaction amount exceeds a daily limit `L` on any single calendar day. Return a list of `(account_id, date)` pairs that were flagged, sorted by account then date. ```python from datetime import date def flag_accounts( transactions: list[tuple[int, int, float]], # (account_id, unix_ts, amount) daily_limit: float ) -> list[tuple[int, date]]: pass ``` ``` Input: transactions = [ (1, 1700000000, 500.0), (1, 1700000100, 600.0), # same day as above (2, 1700000000, 100.0), ] daily_limit = 1000.0 Output: [(1, date(2023, 11, 14))] # Account 1 total on that day = 1100 > 1000 # Account 2 total = 100 <= 1000 ``` ## Follow-ups 1. How do you handle timezone-aware vs. UTC timestamps when grouping by calendar day? 2. If transactions stream in real time, how do you efficiently update daily totals without reprocessing all records? 3. Extend to flag accounts that exceed a rolling 24-hour window, not just a calendar day. 4. How would you write a SQL query to solve this problem instead?