Problema
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.
Vincoli
0 ≤ seconds ≤ 1,000,000,000. Hours may exceed 23; this is a duration, not a time of day.
Esempi
Input:
seconds = 7325
Output atteso:
expected = "2h 2m 5s"Input:
long long seconds = 7325;
Output atteso:
std::string expected = "2h 2m 5s";Input:
long seconds = 7325;
Output atteso:
string expected = "2h 2m 5s";Spiegazione
7325 = 2 × 3600 + 2 × 60 + 5.
Input:
seconds = 120
Output atteso:
expected = "2m"Input:
long long seconds = 120;
Output atteso:
std::string expected = "2m";Input:
long seconds = 120;
Output atteso:
string expected = "2m";Spiegazione
120 seconds is exactly 2 minutes. Omit the zero hours and seconds.
Come affrontarlo
Prova prima da solo, poi apri un suggerimento alla volta.
Suggerimento 1
Break the total seconds into larger units first, then format only the nonzero parts.
Suggerimento 2
Keep hours, minutes, and seconds in that order, with spaces between included units.
Suggerimento 3
If every larger unit is zero, still make sure the output is exactly 0s when the duration is zero.
Complessità attesa
O(1) time, O(1) extra space
Riferimenti
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