A963 | $Icy Perimeter--Silver$

来源USACO

时间限制1s

内存限制128MB

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题目描述

Farmer John is going into the ice cream business! He has built a machine that produces blobs of ice cream but unfortunately in somewhat irregular shapes, and he is hoping to optimize the machine to make the shapes produced as output more reasonable. The configuration of ice cream output by the machine can be described using an $N \times N$ grid ($1 \leq N \leq 1000$) as follows:

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