摘要：
Why did the cow cross the road? Well, one reason is that Farmer John's farm simply has a lot of road s, making it impossible for his cows to travel ar 阅读全文
摘要：
The long road through Farmer John's farm has NN crosswalks across it, conveniently numbered 1 \ldots N1…N (1 \leq N \leq 100,0001≤N≤100,000). To allow 阅读全文