摘要：
Problem DescriptionThere is a piece of grids land of size n×m. Chandler and his team take responsibility to guard it. There are some searchlights on some pieces and each of them has a capability to lighten a distance towards four directions: north, south, east and west. Different searchlight ha 阅读全文
posted @ 2014-04-07 18:32
Oyking
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