EVacuate to Moon

Pesla needs to charge $N$ cars before sending them to space. The $i^{th}$ car has an energy capacity $A_i$ Watt-hours. There are $M$ power outlets. The $j^{th}$ outlet provides a power of $B_j$ Watt. If an outlet can charge **at most** one car and a car can be charged by **at most** one outlet, find the **maximum** total energy (in Watt-hours) stored in all cars after $H$ hours. Note: - A p