摘要：
Drainage DitchesTime Limit:1000MSMemory Limit:10000KDescriptionEvery time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means that the clover is covered by water for awhile and takes quite a long time to regrow. Thus, Farmer John has built a set of 阅读全文
posted @ 2013-10-24 22:33
流水依依
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