Placing as many polyominoes as possible on a rectangle?

Question

Algorithms

Given a rectangle of size MxN and exactly 20 identical polyominoes in the shape of the letter "L".
It is required to place the largest possible polyomino on a rectangle.
Can you advise what to read on this topic or submit an idea?

Answer 1

Exams soon?
Schoolchildren have become frequent.
Think with your head.