Compute dasher pay from order events

## Dasher naive pay (active-time with overlapping orders) You are given a list of events describing when a delivery driver ("Dasher") accepts and fulfills different orders. ### Pay rules - Base rate: **$0.30 per minute**. - An order is **active** from the time it is **ACCEPT**ed until it is **FULFILL**ed. - Pay is **multiplicative by concurrency**: for each minute, the dasher earns \[ \text{pay per minute} = (\#\text{active orders during that minute}) \times 0.30 \] ### Input `events`: a list of records `(time, orderId, action)` where: - `time` is an integer timestamp in **minutes** (e.g., minutes since midnight). - `orderId` is a string identifier. - `action` is one of: `ACCEPT`, `FULFILL`. ### Output Return the **total pay** as a `double`, rounded to **two decimals**. ### Important details / assumptions - `events` may be unsorted; you must process them in increasing `time`. - If multiple events have the **same** `time`, process all `ACCEPT` actions **before** `FULFILL` actions at that same time. - Pay accrues over each interval between consecutive event timestamps. For an interval `[t_i, t_{i+1})`, the number of active orders is considered constant and equals the active set **after applying** all actions at `t_i`. - You may assume the input is valid: each order is accepted before it is fulfilled. ### Example Events: - 06:15 A ACCEPT - 06:18 B ACCEPT - 06:36 A FULFILL - 06:45 B FULFILL Pay: - 06:15–06:18: 1 active × 3 min × 0.3 = 0.9 - 06:18–06:36: 2 active × 18 min × 0.3 = 10.8 - 06:36–06:45: 1 active × 9 min × 0.3 = 2.7 Total = 14.4