Average downtime per stop
Support wants a single number for "how long stops usually take", averaged over every recorded event.
- The average is the total duration divided by the count, truncated down.
- With no events at all the average is treated as zero.
meanDowntime(durations: list<int>) → int
Java 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
int meanDowntime(List<Integer> durations) {
}Worked examples
| Call | Result |
|---|---|
meanDowntime(Main.<Integer>ls(10, 20, 30)) | 20 |
meanDowntime(Main.<Integer>ls(5, 6)) | 5 |
meanDowntime(Main.<Integer>ls()) | 0 |
meanDowntime(Main.<Integer>ls(100)) | 100 |
Hint
Sum then divide by the length; guard the empty case.
Reference solution in Java
int meanDowntime(List<Integer> durations) {
if (durations.isEmpty()) return 0;
int sum = 0;
for (int d : durations) sum += d;
return sum / durations.size();
}