Incuie usa si se grabeste spre lift.

 

A. Timp minim (10%)

Petru sta la etajul 8. Aude vecinul de la etajul 6 cand isi ia la revedere de la sotie si se suie in lift – acesta urca la 10, unde este administratorul blocului pentru a plati intretinerea. Liftul din blocul lui Petru se comporta ciudat: opreste pe rand la fiecare etaj, chiar daca nu exista nicio persoana care urca sau coboara din lift si continua neintrerupt (cand ajunge la parter incepe urcarea, cand ajunge la ultimul etaj incepe coborarea). Liftul urca / coboara un etaj de 2 ori mai rapid decat daca Petru ar cobori pe scari. Cum Petru se grabeste, doreste sa ajunga cat mai rapid la parter. Cum procedeaza el? Are mai multe posibilitati?

Sursa: problema originală (Ruxandra F. Olimid)

 

Petru locks the door and rushes to the elevator.

 

A. Minimum time (10%)

Peter lives at the 8th floor. He hears his neighbor from the 6th floor when they say goodbye to his wife and takes the elevator up - he goes up to the 10th floor, to pay maintenance. The elevator behaves strangely: it stops on each floor, even if there is no person going in and out, and it continues uninterrupted (when it reaches the ground floor, it goes up again, when it reaches the top floor, it starts to go down). The elevator goes up / down one floor two times faster than if Peter takes the stairs. Because Peter hurries, he wants to be downstairs as quickly as possible. What is Petru’s strategy to go down? Are there several possibilities?

Sursa: original problem (Ruxandra F. Olimid)

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