题目描述 Every day each of Farmer John's N (1 <= N <= 100,000) cows conveniently numbered 1..N move from the barn to her private pasture. The pastures are organized as a tree, with the barn being on pasture 1. Exactly N-1 cow unidirectional paths connec…
To 洛谷.2982 慢下来Slowing down 题目描述 Every day each of Farmer John's N (1 <= N <= 100,000) cows conveniently numbered 1..N move from the barn to her private pasture. The pastures are organized as a tree, with the barn being on pasture 1. Exactly N-1 cow…
//神题目(题目一开始就理解错了)... 题目描述 Why did the cow cross the road? Well, one reason is that Farmer John's farm simply has a lot of roads, making it impossible for his cows to travel around without crossing many of them. 奶牛们为什么要穿马路?一个原因只是因为FJ的牧场的路实在是太多了,使得奶牛们每…