= Partner Units = <> == Problem description == Partner unit problem describes a people counting system. The problem includes three types of components, namely a door sensor, a zone and a communication unit. The problem requirements are: 1. Each zone as well as each door sensor must be connected to exactly one unit; 2. Each unit can control at most two door sensors and at most two zones; 3. If a unit controls a door sensor that contributes to a zone controlled by another unit, then the two units must be connected directly, i.e. one unit becomes a partner unit of the other and vice versa; 4. Each unit can have at most maxPU partner units which is constant for each problem instance. The solution of the partner unit problem is defined as follows: * Given a consistent configuration of door sensors and zones, a number of available units lower and a constant maxPU, find a valid assignment of units that satisfies all requirements. == Input format == == Output format == == Example == == Author(s) == * Anna Ryabokon * Alpen-Adria University, Austria * Andreas Falkner * Siemens AG * Gerhard Friedrich * Alpen-Adria University, Austria