CookBook

Mobile phones Description Suppose that the fourth generation mobile phone base stations in the Tampere area operate as follows. The area is divided into squares. The squares form an S * S matrix

Markdown及扩展 这道题涉及到怎么把多叉树的查询转化为树状数组的前缀和查询 思想：通过某种办法将x转化为一个区间[L,R]； 一个连续的区间可以代表一棵子树 代码块语法遵循标准markdown代码，例如：#include <iostream> #include <cstdio> #include <vector> using namespace std;/* id[i]编号为i