Matrix Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 20599   Accepted: 7673 Description Given an N*N matrix A, whose elements are either 0 or 1. A[i, j] means the number in the i-th row and j-th column. Initially we have A[i, j] = 0 (1…

Matrix Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 21757   Accepted: 8141 Description Given an N*N matrix A, whose elements are either 0 or 1. A[i, j] means the number in the i-th row and j-th column. Initially we have A[i, j] = 0 (1…

题意:给你一个矩阵开始全是0,然后给你两种指令,第一种:C x1,y1,x2,y2 就是将左上角为x1,y1,右下角为x2,y2,的这个矩阵内的数字全部翻转,0变1,1变0 第二种:Q x1 y1,输出举证x1,y1,位置的数值 思路:该题的巧妙之处是反转的重叠抵消,记住要向上统计,向下修改:二维情况,最主要的是理解那个数组中的每个点保存的值的意义(一个矩形区域的总和):最后记住取余: 此题参考博客 http://blog.csdn.net/xymscau/article/details/660…

二维树状数组模版,唯一困难,看题!!(其实是我英语渣) Matrix Time Limit: 3000MS Memory Limit: 65536K Total Submissions: 22098 Accepted: 8240 Description Given an N*N matrix A, whose elements are either 0 or 1. A[i, j] means the number in the i-th row and j-th column. Initiall…

Matrix Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 25004   Accepted: 9261 Description Given an N*N matrix A, whose elements are either 0 or 1. A[i, j] means the number in the i-th row and j-th column. Initially we have A[i, j] = 0 (1…

Matrix Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 16950   Accepted: 6369 Description Given an N*N matrix A, whose elements are either 0 or 1. A[i, j] means the number in the i-th row and j-th column. Initially we have A[i, j] = 0 (1…

Apple Tree Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 27092   Accepted: 8033 Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka likes apple very much, so he has been…

Stars Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 42898   Accepted: 18664 Description Astronomers often examine star maps where stars are represented by points on a plane and each star has Cartesian coordinates. Let the level of a st…

http://poj.org/problem?id=2299 最初做离散化的时候没太确定可是写完发现对的---由于后缀数组学的时候,,这样的思维习惯了吧 1.初始化as[i]=i:对as数组依照num[]的大小间接排序 2.bs[as[i]]=i:如今bs数组就是num[]数组的离散化后的结果 3.注意,树状数组中lowbit(i)  i是不能够为0的,0&(-0)=0,死循环... #include <cstdio> #include <cstring> #include…

Description Given an N*N matrix A, whose elements are either 0 or 1. A[i, j] means the number in the i-th row and j-th column. Initially we have A[i, j] = 0 (1 <= i, j <= N). We can change the matrix in the following way. Given a rectangle whose upp…