How much room is left
A venue has a maximum capacity and a list of party sizes arriving. Return how many more guests can still enter.
- Sum all party sizes and subtract from capacity.
- If the parties already fill or exceed the room the answer is zero, never negative.
- An empty party list means nobody arrived yet.
capacityLeft(capacity: int, partySizes: 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 capacityLeft(capacity int, partySizes []int) int {
}Worked examples
| Call | Result |
|---|---|
capacityLeft(100, []int{20, 25, 30}) | 25 |
capacityLeft(50, []int{10, 20, 25}) | 0 |
capacityLeft(100, []int{20, 25, 30, 15, 12}) | 0 |
capacityLeft(200, []int{}) | 200 |
Hint
Sum the list, subtract from capacity, and floor at zero.
Reference solution in Go
func capacityLeft(capacity int, partySizes []int) int {
total := 0
for _, s := range partySizes {
total += s
}
if capacity > total {
return capacity - total
}
return 0
}