I'm quite poor at solving GRAPHIC problems, like shortest paths, maximum flow, etc.

I don't think I'm patient enough to read or study the algorithm in it ...

Luckily, I haven't run across GRAPHIC problems in important contests...

In a month, it's the National Olympiad Informatics (Province)-->NOIP contests, I'm afraid that there will be a problem like that...

Can you give me some suggestions?