CLOCK:Author: Tushar Kadam Tester: Sangram Desai Editorialist: Tushar Kadam DIFFICULTY:SIMPLE PREREQUISITES:
PROBLEM:Given time in HH MM SS format and you have to find what will be time after hour hand moves by x degrees. EXPLANATION:If hour hand moves by 1 degree then 2 minutes will happen in 12 hour clock. As x is integer and smallest change in x can be only 1 degree hence second hand will come to its original position whatever may be the value of x i.e SS field will not change. Now find if minutes to add in MM field is greater than 60 or not . If final MM field > 60 then add extra minutes in hour by converting minutes to hour. Note : if x > 360 that means hour hand has moved by more than 360 degrees i.e several complete rotations have happened. so to solve one can do x = x%360 which will have same effect. Possible testcases where you may get wrong answers: input : 6 11 58 59 1 11 59 1 1 12 58 55 28 11 2 23 29 11 2 0 361 11 59 27 62 output: 12 0 59 12 1 1 1 54 55 12 0 23 11 4 0 2 3 27 AUTHOR'S AND TESTER'S SOLUTIONS:Author's solution Java Solution Tester's solution Python Solution.
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asked 09 Sep '18, 14:22

The preliminary step here is to find out what $1$ degree motion of the hour hand means in terms of time. 0ne full rotation of the hour hand is $12$ hours or $12\times 60 = 720$ minutes, and conveniently we have $720/360 = 2$ exactly; giving $2$ minutes per degree. If, instead of degrees, the question had asked the time after the hour hand is moved by $x$ gradians, which have $400$ for a full turn, we would have had to go down to an effect in seconds, with $720\times 60 = 43200$ second in a full turn of the hour hand and thus $108$ seconds per gradian. answered 13 Sep '18, 02:43
@joffan Thanks for your suggestion about use of gradians in problem . But I wanted to design an easy problem So I deliberately made a special case in which that it turns out that 1 degree corresponds to 2 minutes. So bonus question : x can be negative
(13 Sep '18, 23:43)
1
Oh sure, I wasn't complaining at all about the use of degrees. Just pointing out where the 1 degree = 2 minutes comes from. And my alternative example was gradians not radians  they would be much more difficult since a full turn in radians is $2\pi$. PS: re bonus question: my code already worked correctly. :)
(13 Sep '18, 23:51)
Oh my bad! Edited! And I just saw your code.
(14 Sep '18, 00:09)
