How much is still owed
Compare the amount due against a list of payments already received and return the shortfall.
- Shortfall is due minus total payments, clamped at zero.
- An empty payment list means the full amount is still owed.
balanceShortfall(due: int, payments: 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 balanceShortfall(due int, payments []int) int {
}Worked examples
| Call | Result |
|---|---|
balanceShortfall(10000, []int{3000, 4000}) | 3000 |
balanceShortfall(5000, []int{5000}) | 0 |
balanceShortfall(5000, []int{6000}) | 0 |
balanceShortfall(1000, []int{}) | 1000 |
Hint
Sum the payments and subtract from due.
Reference solution in Go
func balanceShortfall(due int, payments []int) int {
paid := 0
for _, p := range payments {
paid += p
}
if due > paid {
return due - paid
}
return 0
}