Editorial for New Year's '18 P1 - Happy New Year!

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Author: Kirito

We can convert $h$ ~h~ and $m$ ~m~ into seconds and add them to $s$ ~s~. The number of seconds the task takes is $s \bmod 60$ ~s \bmod 60~ and the number of minutes $\left\lfloor \dfrac s {60} \right\rfloor \bmod 60$ , and the number of hours is $\left\lfloor \dfrac s {3600} \right\rfloor \bmod 12$ . Then, subtract that from 12:00:00 to get the answer. Note that the hours output should be between $0$ ~0~ and $11$ ~11~.

Time Complexity: $\mathcal O(1)$ ~\mathcal O(1)~

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