洛谷P2882 [USACO07MAR]面对正确的方式Face The Right Way(贪心)题目描述Farmer John has arranged his N (1 ≤ N ≤ 5,000) cows in a row and many of them are facing forward, like good cows. Some of them are facing backward, though, and he needs them all to face forward to make his life perfect. Fortunately, FJ recently bo...