Statement

For the past months you've been investigating the theft of the Golden Helmet of Coțofenești. You managed to narrow down the list of possible hiding spots down to N locations, but can't make further progress, so you resort to the help of Mob, a psychic with supernatural abilities. You can give your friend Mob 2 locations amongst the N on the list and he will use his psychic abilities to tell you if the stolen helmet is closer (measured by Euclidean distance) to the 1st or the 2nd location. However, great power comes with great energy consumption, so he needs a whole day of rest after each search. Since you want to solve the case as soon as possible you'll need to make good use of Mob's powers.