摘要：1597: [Usaco2008 Mar]土地购买 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 <= 1,000,000; 1 <= 长 <= 1,000,000). 每块土地的价格是它 阅读全文

摘要：1677: [Usaco2005 Jan]Sumsets 求和 Description Farmer John commanded his cows to search for different sets of numbers that sum to a given number. The cow 阅读全文

摘要：1616: [Usaco2008 Mar]Cow Travelling游荡的奶牛 Description 奶牛们在被划分成N行M列(2 <= N <= 100; 2 <= M <= 100)的草地上游走，试图找到整块草地中最美味的牧草。Farmer John在某个时刻看见贝茜在位置 (R1, C1) 阅读全文