Running total of order value
Given `orders` with columns `order_id`, `customer`, `amount`, `status` and `placed`, return a running total of `amount` in `placed` order as `running`. Return `order_id` and `running`, sorted by `placed` ascending.
Implement
running_total(orders: dataframe) → dataframeExamples
in
[{"__df__":[{"amount":120.5,"placed":"2024-01-05","status":"paid","customer":"ada","order_id":1},{"amount":80,"placed":"2024-01-07","status":"refunded","customer":"bo","order_id":2},{"amount":45.25,"placed":"2024-02-11","status":"paid","customer":"ada","order_id":3},{"amount":200,"placed":"2024-02-14","status":"paid","customer":"cy","order_id":4},{"amount":15.75,"placed":"2024-03-02","status":"pending","customer":"bo","order_id":5},{"amount":60,"placed":"2024-03-19","status":"paid","customer":"ada","order_id":6}]}]out[{"running":120.5,"order_id":1},{"running":200.5,"order_id":2},{"running":245.75,"order_id":3},{"running":445.75,"order_id":4},{"running":461.5,"order_id":5},{"running":521.5,"order_id":6}]What a strong answer looks like
State 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.
0:00 of about 11 min
solution.py
InputExpectedGot
[{"__df__":[{"amount":120.5,"placed":"2024-01-05","status":"paid","customer":"ada","order_id":1},{"amount":80,"placed":"2024-01-07","status":"refunded","customer":"bo","order_id":2},{"amount":45.25,"placed":"2024-02-11","status":"paid","customer":"ada","order_id":3},{"amount":200,"placed":"2024-02-14","status":"paid","customer":"cy","order_id":4},{"amount":15.75,"placed":"2024-03-02","status":"pending","customer":"bo","order_id":5},{"amount":60,"placed":"2024-03-19","status":"paid","customer":"ada","order_id":6}]}][{"running":120.5,"order_id":1},{"running":200.5,"order_id":2},{"running":245.75,"order_id":3},{"running":445.75,"order_id":4},{"running":461.5,"order_id":5},{"running":521.5,"order_id":6}]not run yetsample