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Search in a maze Design

On an office floor , there are e entities - Walls , Cubicles , Coffee Rooms. 

In what data structure we should store this design that when a new member joins the company , the cubicle number which is empty and next closest to any coffee room should be assigned to it. 

Basically , data structure DS.pop() should return that cubicle number in the most efficient way. 

A Person can walk through cubicles to reach a coffee room but not through walls.

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