CCC '16 J4 - Arrival Time

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Points: 5
Time limit: 2.0s
Memory limit: 64M

Problem type
Allowed languages
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Fiona commutes to work each day. If there is no rush-hour traffic, her commute time is 2 hours. However, there is often rush-hour traffic. Specifically, rush-hour traffic occurs from 07:00 (7am) until 10:00 (10am) in the morning and 15:00 (3pm) until 19:00 (7pm) in the afternoon. During rush-hour traffic, her speed is reduced by half.

She leaves either on the hour (at XX:00), 20 minutes past the hour (at XX:20), or 40 minutes past the hour (at XX:40).

Given Fiona's departure time, at what time does she arrive at work?

Input Specification

The input will be one line, which contains an expression of the form HH:MM, in which HH is one of the 24 starting hours (00, 01, ..., 23) and MM is one of the three possible departure minute times (00, 20, 40).

Output Specification

Output the time of Fiona's arrival, in the form HH:MM.

Sample Input 1

05:00

Output for Sample Input 1

07:00

Explanation for Output for Sample Input 1

Fiona does not encounter any rush-hour traffic, and leaving at 5am, she arrives at exactly 7am.

Sample Input 2

07:00

Output for Sample Input 2

10:30

Explanation for Output for Sample Input 2

Fiona drives for 3 hours in rush-hour traffic, but only travels as far as she normally would after driving for 1.5 hours. During the final 30 minutes (0.5 hours) she is driving in non-rush-hour traffic.

Sample Input 3

23:20

Output for Sample Input 3

01:20

Explanation for Output for Sample Input 3

Fiona leaves at 11:20pm, and with non-rush-hour traffic, it takes two hours to travel, so she arrives at 1:20am the next day.


Comments


  • -7
    Eason_Hao1019  commented on Jan. 9, 2021, 12:22 a.m.

    This comment is hidden due to too much negative feedback. Click here to view it.


    • 0
      littlemouseAM  commented on Jan. 9, 2021, 12:22 p.m.

      13j4 was the easiest for me. This one I actually found rather difficult.


  • 0
    cz52013141834  commented on Dec. 31, 2020, 1:39 p.m.

    还好吧,我一个刚学Java的都做出来了


  • -4
    wome  commented on Oct. 31, 2020, 2:21 p.m.

    确实很难


    • 1
      alexzhang  commented on Oct. 31, 2020, 6:00 p.m.

      不难还算是题吗


  • 0
    MisakaMikoto  commented on Jan. 4, 2020, 2:11 p.m.

    有点难