| Parking Lot |
At a certain college, a small parking lot is arranged in a rectangular shape, with 20 spaces numbered 1, 2, 3..... 19, 20. Traffic flow is one way in a counter- clockwise direction. The lot looks something like this:
______________________________________________________
| |
| 20 19 18 17 16 15 14 13 12 11 |
Exit <<<< < < < < < < < < < |
| v ^ |
Entrance >>>> > > > > > > > > > |
| 1 2 3 4 5 6 7 8 9 10 |
|______________________________________________________|
Note that the first position encountered upon entering is 1 and the last is 20. Cars may exit or continue to drive in a counter-clockwise direction. The following assumptions apply to this problem:
Positions are vacated in the order in which their numbers appear in the second part of the data. Read these until end of file.
6 19 17 13 1 99 1 3 20 16
Original position 6 parked in 16 Original position 19 parked in 3 Original position 17 did not park Original position 13 parked in 20 Original position 1 parked in 1