bzoj 1597 斜率DP

1597: [Usaco2008 Mar]土地购买 Time Limit: 10 Sec  Memory Limit: 162 MB Submit: 5115  Solved: 1897 [Submit][Status][Discuss] Description 农夫John准备扩大他的农场,他正在考虑N (1 <= N <= 50,000) 块长方形的土地. 每块土地的长宽满足(1 <= 宽 <

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