随笔分类 - 网络流
摘要:On a grid map there are n little men and n houses. In each unit time, every little man can move one unit step, either horizontally, or vertically, to
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摘要:Cows are such finicky eaters. Each cow has a preference for certain foods and drinks, and she will consume no others. Farmer John has cooked fabulous
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摘要:Drainage Ditches Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means that the clover is covered
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