CSP/信奥赛C++刷题训练：经典前缀和例题（4）：洛谷P3662：Why Did the Cow Cross the Road II S

CSP/信奥赛C++刷题训练：经典前缀和例题（4）

[USACO17FEB] Why Did the Cow Cross the Road II S

题目描述

The long road through Farmer John’s farm has $N$ crosswalks across it, conveniently numbered $1\dots N$ ($1\le N\le$