enter image description here

Find the time of screening of each of the movies in each of the screens. Need help to solve this.Please share Approach.

Source : IMS

  • $\begingroup$ Sorry if I missed this, what exactly are we trying to solve? $\endgroup$
    – Robert S.
    Oct 15, 2018 at 14:35
  • 2
    $\begingroup$ @RobertS. I am currently thinking we have to figure out when the movies were screened on all 3 screens $\endgroup$
    – gabbo1092
    Oct 15, 2018 at 14:37

2 Answers 2


Screen 1:

10 AM : A
12:30 PM : A
3 PM : A
5:30 PM : B
7:30 PM : C
10:30 PM : D

Screen 2:

10 AM : D
12:30 PM : B
2:30 PM : B
4:30 PM : D
7 PM : C

Screen 3:

10 AM : C
1 PM : A
3:30 PM : D
6 PM : B
8 PM : C
11 PM : D

Method for solving:

Started by solving for what movies were played on screen 3 with the info on the 2nd table. For example, since there are 4 screening of movie A and 3 of them are being screened on screen 1 and none on screen 2 there is one screening on screen 3. Using similar logic for the rest I deduced that there was 1 screening of A, 1 of B, 2 of C, and 2 of D on screen 3.

Next I started by figuring out the times possible, which lead to my solving of screen 1. Since 3 screening must happen of A on screen 1 only one slot would not be possible. If you look at the lengths of the films you can tell that you cannot have both the 12:30 PM and 1 PM slot happen at the same screen becuase movie A is too long. This means that the 10 AM slot and the 3PM slot of A were guaranteed to be in screen 1. After that I basically went through A and found the time slots that would be possible for each movie based on their lengths and and which movies needed to be screened in screen 1.
After screen 1 was solved I tried to work out the rest starting with screen 3 (because I had figured out that movie A had to be screened there at 1 PM). Similarly to how I solved for A, I tried to optimize times by looking at the ending and starting times for movies and fit them all best I could which lead to my answer for screen 3 and screen 2 (since it just filled in the leftovers).

  • 1
    $\begingroup$ This is close, but Screen 2 has too large a gap between 12:30 and 3:30 for movie B, and Screen 3 has too short a gap between 1:00 and 2:30. Switching these around should fix the answer. $\endgroup$
    – Yessoan
    Oct 16, 2018 at 0:50
  • $\begingroup$ Your answer is partially correct. There is an error in screen 1 12:30 pm and 1:00 pm cant be together for movie A. Thanks for your approach. It was helpful. @gabbo1092. $\endgroup$
    – sam
    Oct 16, 2018 at 2:46
  • $\begingroup$ @Yessoan Thanks somehow I had misinterpreted the rules as a minimum of 15 min difference not a set minimum. Had to do some adjusting but should all be fixed now. $\endgroup$
    – gabbo1092
    Oct 16, 2018 at 12:22

A is shown in theaters

1, 1, 3, then 1
This can be deduced directly from the tables.

B is shown in theaters

2, 2, 1, then 3
Theater 1 is occupied by A from 10-5:30, so the only B slot that fits is 5:30.

C is shown in theaters

3, 2, 1, then 3
C is across all three theaters at 7-8, so must start in theater 3.

D is shown in theaters

2, 3, 2, 1, then 3.
Must start in theater two, fill in the rest of the gaps.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.