Battle of Winterfell

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Winterfell is attacked by the Night King. House Stark is in danger. In order to capture winterfell, the white walkers need to attack it with all its power. But winterfell is a large fort $A$ of dimensions $M * N$ and white walkers have a small army which can only attack area $B$ of dimensions $P * Q$ at a time. Winterfell can only be captured if they attack every possible area of it. The problem

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solution.cppC++17

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