Luo Gu $ P3756 \ [CQOI2017] $ Old C block network streaming

Positive Solutions: Network Flow

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Portal $ QwQ $

You hate to see a given pattern can not appear, in simple terms it, a special edge on both sides of the box can not re-connect box.

So if there is, the equivalent of four scenarios? Were fried on four squares.

Then, after a wave of calm analysis found that for special lattice edges on both sides of the bombing that is not affected? So these two cells would only choose a smaller fry like, so now it becomes three options can be considered and before doing that road, hotel King, about the same map building, $ over $