【POJ 1195】Mobile phones
2016-03-11 22:49
405 查看
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 with the rows and columns numbered from 0 to S-1. Each square contains a base station. The
number of active mobile phones inside a square can change because a phone is moved from a square to another or a phone is switched on or off. At times, each base station reports the change in the number of active phones to the main base station along with
the row and the column of the matrix.
Write a program, which receives these reports and answers queries about the current total number of active mobile phones in any rectangle-shaped area.
Input
The input is read from standard input as integers and the answers to the queries are written to standard output as integers. The input is encoded as follows. Each input comes on a separate line, and consists of one instruction integer and a number of parameter
integers according to the following table.
The values will always be in range, so there is no need to check them. In particular, if A is negative, it can be assumed that it will not reduce the square value below zero. The indexing starts at 0, e.g. for a table of size 4 * 4, we have 0 <= X <= 3 and
0 <= Y <= 3.
Table size: 1 * 1 <= S * S <= 1024 * 1024
Cell value V at any time: 0 <= V <= 32767
Update amount: -32768 <= A <= 32767
No of instructions in input: 3 <= U <= 60002
Maximum number of phones in the whole table: M= 2^30
Output
Your program should not answer anything to lines with an instruction other than 2. If the instruction is 2, then your program is expected to answer the query by writing the answer as a single line containing a single integer to standard output.
Sample Input
Sample Output
题目大意:给你一个矩阵,求某一个子矩阵的所有元素和。
思路:简单的二维树状数组模板题。
代码:
Time Limit: 5000MS | Memory Limit: 65536K | |
Total Submissions: 17421 | Accepted: 8049 |
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 with the rows and columns numbered from 0 to S-1. Each square contains a base station. The
number of active mobile phones inside a square can change because a phone is moved from a square to another or a phone is switched on or off. At times, each base station reports the change in the number of active phones to the main base station along with
the row and the column of the matrix.
Write a program, which receives these reports and answers queries about the current total number of active mobile phones in any rectangle-shaped area.
Input
The input is read from standard input as integers and the answers to the queries are written to standard output as integers. The input is encoded as follows. Each input comes on a separate line, and consists of one instruction integer and a number of parameter
integers according to the following table.
The values will always be in range, so there is no need to check them. In particular, if A is negative, it can be assumed that it will not reduce the square value below zero. The indexing starts at 0, e.g. for a table of size 4 * 4, we have 0 <= X <= 3 and
0 <= Y <= 3.
Table size: 1 * 1 <= S * S <= 1024 * 1024
Cell value V at any time: 0 <= V <= 32767
Update amount: -32768 <= A <= 32767
No of instructions in input: 3 <= U <= 60002
Maximum number of phones in the whole table: M= 2^30
Output
Your program should not answer anything to lines with an instruction other than 2. If the instruction is 2, then your program is expected to answer the query by writing the answer as a single line containing a single integer to standard output.
Sample Input
0 4 1 1 2 3 2 0 0 2 2 1 1 1 2 1 1 2 -1 2 1 1 2 3 3
Sample Output
3 4
题目大意:给你一个矩阵,求某一个子矩阵的所有元素和。
思路:简单的二维树状数组模板题。
代码:
#include <cstdio> #include <iostream> #include <cstring> #include <cmath> #include <algorithm> #include <vector> #define N 100010 using namespace std; int matrix[1050][1050],n; int lowbit(int k) ///二维树状数组基本模板,不会的可以百度随便搜个看着 { return k&(-k); } void add(int x,int y,int val) { for(int i=x;i<=n;i+=lowbit(i)) { for(int j=y;j<=n;j+=lowbit(j)) { matrix[i][j]+=val; } } } int getSum(int x,int y) { int res=0; for(int i=x;i>0;i-=lowbit(i)) { for(int j=y;j>0;j-=lowbit(j)) { res+=matrix[i][j]; } } return res; } int main() { int init; while(~scanf("%d%d",&init,&n)) { if(init==0) { memset(matrix,0,sizeof(matrix)); int op,x,y,val,z,w; while(1) { scanf("%d",&op); if(op==3) break; if(op==1) { scanf("%d%d%d",&x,&y,&val); x++,y++; add(x,y,val); } if(op==2) { scanf("%d%d%d%d",&x,&y,&z,&w); z++,w++,x++,y++; printf("%d\n",getSum(z,w)-getSum(z,y-1)-getSum(x-1,w)+getSum(x-1,y-1)); ///注意二维树状数组不是单纯的后面减前面 } } } } }
相关文章推荐
- Java各种容器比较 (图例)
- Android Studio插件-自动根据布局生成Activity等代码(插件代码开源)
- 格式化时间样式
- Mars《Android开发视频教程》
- ES+Hbase对接方案概述
- 二叉树中和为某一值的路径
- 如何设置光标距离左边的位置,为我们的textfield添加一个Leftview
- 关于编程风格
- 宏定义中Error[Pe029]: expected an expression
- 数据插入与删除
- String ,Stringbuffer ,StringBuilder;
- matlab小问题
- 练习轮播海报
- 八皇后问题最简单的解法
- 冒泡排序和快速排序
- 事件处理
- 深入flask之异步非堵塞实现
- iOS模拟器,点击textfield为什么不弹出软键盘
- jQuery——常用方法
- ::操作全局变量