Editorial for GFSSOC '14 Winter J3 - Waiting

Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
Submitting an official solution before solving the problem yourself is a bannable offence.

Split each time into seconds, minutes, and hours, and then get the total number of seconds using the formula:

$\displaystyle \text{total} = \text{seconds} + \text{minutes} \times 60 + \text{hours} \times 3600$

The difference between the two totals is the answer.

Skills needed: String manipulation, simple math

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

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