問題
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.
制約
0 ≤ seconds ≤ 1,000,000,000. Hours may exceed 23; this is a duration, not a time of day.
例
入力：
seconds = 7325
期待される出力：
expected = "2h 2m 5s"入力：
long long seconds = 7325;
期待される出力：
std::string expected = "2h 2m 5s";入力：
long seconds = 7325;
期待される出力：
string expected = "2h 2m 5s";解説
7325 = 2 × 3600 + 2 × 60 + 5.
入力：
seconds = 120
期待される出力：
expected = "2m"入力：
long long seconds = 120;
期待される出力：
std::string expected = "2m";入力：
long seconds = 120;
期待される出力：
string expected = "2m";解説
120 seconds is exactly 2 minutes. Omit the zero hours and seconds.
解き方のヒント
まずは自分で考えてから、ヒントを 1 つずつ開いてみましょう。
ヒント 1
Break the total seconds into larger units first, then format only the nonzero parts.
ヒント 2
Keep hours, minutes, and seconds in that order, with spaces between included units.
ヒント 3
If every larger unit is zero, still make sure the output is exactly 0s when the duration is zero.
目安の計算量
O(1) time, O(1) extra space
参考資料
この課題はCodeUtility用に調整されています。上記の説明と制約に従ってください。