Replay a day of stock movements
The warehouse log holds a day of movements for one part: positive for receipts, negative for picks. Replay them to get the closing figure.
- Stock can never go below zero. A pick larger than what is there empties the shelf and stops — it does not go negative.
- Because of that floor, the order matters: you cannot just add everything up.
stockAfterMoves(opening: int, moves: list<int>) → int
Go needs a compiler and Drill does not host one yet, so this page is the reference rather than an exercise: the problem, worked examples, and the solution in full. To type it out, the same problem runs in Python.
Where you start
func stockAfterMoves(opening int, moves []int) int {
}Worked examples
| Call | Result |
|---|---|
stockAfterMoves(10, []int{-3, 5, -4}) | 8 |
stockAfterMoves(10, []int{-3, 5, -20}) | 0 |
stockAfterMoves(5, []int{-10, 3}) | 3 |
stockAfterMoves(0, []int{}) | 0 |
Hint
Apply one movement at a time and clamp at zero after each.
Reference solution in Go
func stockAfterMoves(opening int, moves []int) int {
level := opening
if level < 0 {
level = 0
}
for _, m := range moves {
level += m
if level < 0 {
level = 0
}
}
return level
}