Problem
Split a duration into hours, minutes, and seconds. Write units as h, m, and s, in that order, with one space between units. Omit any zero-valued unit, except that zero seconds is written as 0s.
Implement format_duration(seconds).
Input
seconds: The total duration in seconds.
Output
Return the formatted duration, for example 2h 2m 5s.
Constraints
0 ≤ seconds ≤ 1,000,000,000. Hours may exceed 23; this is a duration, not a time of day.
Examples
Input:
seconds = 7325
Expected output:
expected = "2h 2m 5s"Input:
long long seconds = 7325;
Expected output:
std::string expected = "2h 2m 5s";Input:
long seconds = 7325;
Expected output:
string expected = "2h 2m 5s";Explanation
7325 = 2 × 3600 + 2 × 60 + 5.
Input:
seconds = 120
Expected output:
expected = "2m"Input:
long long seconds = 120;
Expected output:
std::string expected = "2m";Input:
long seconds = 120;
Expected output:
string expected = "2m";Explanation
120 seconds is exactly 2 minutes. Omit the zero hours and seconds.
How to approach it
Try on your own first, then open one hint at a time.
Hint 1
Break the total seconds into larger units first, then format only the nonzero parts.
Hint 2
Keep hours, minutes, and seconds in that order, with spaces between included units.
Hint 3
If every larger unit is zero, still make sure the output is exactly 0s when the duration is zero.
Expected complexity
O(1) time, O(1) extra space
References
This challenge is adapted for CodeUtility. Follow the statement and constraints above.