POJ - 2018 Best Cow Fences （二分 長度>=l的子序列最大和+前綴和）

Best Cow Fences Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 14467   Accepted: 4664 Description Farmer John's farm consists of a long row of N (1 <= N <= 100,000)fields. Each field con

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