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
C# 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
public int BalanceShortfall(int due, List<int> payments) {
}Worked examples
| Call | Result |
|---|---|
BalanceShortfall(10000, new List<int> { 3000, 4000 }) | 3000 |
BalanceShortfall(5000, new List<int> { 5000 }) | 0 |
BalanceShortfall(5000, new List<int> { 6000 }) | 0 |
BalanceShortfall(1000, new List<int> { }) | 1000 |
Hint
Sum the payments and subtract from due.
Reference solution in C#
public int BalanceShortfall(int due, List<int> payments) {
int paid = 0;
foreach (int p in payments) paid += p;
return Math.Max(0, due - paid);
}