introart's blog

By introart, history, 2 months ago, In English

Can anyone please give me some idea about this USACO problem? DELIVER — Delivery Route

Here is the editorial of the problem but I could not understand why 5N nodes are required.

 
 
 
 
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2 months ago, # |
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because you have to build 4n points (up, down, left and right) and themselves, 5n in total.

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    2 months ago, # ^ |
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    But why it is enough to consider only the right-angled paths?