线段树的考题，当然其实也可以用树状数组去解决的：
题目：
`One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n + 1)-th one.`One day, litt
