码迷,mamicode.com
首页 > 其他好文 > 详细

poj2155Matrix

时间:2015-04-27 16:55:31      阅读:102      评论:0      收藏:0      [点我收藏+]

标签:

Time Limit: 3000MS   Memory Limit: 65536K
Total Submissions: 20160   Accepted: 7531

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 upper-left corner is (x1, y1) and lower-right corner is (x2, y2), we change all the elements in the rectangle by using "not" operation (if it is a ‘0‘ then change it into ‘1‘ otherwise change it into ‘0‘). To maintain the information of the matrix, you are asked to write a program to receive and execute two kinds of instructions.

1. C x1 y1 x2 y2 (1 <= x1 <= x2 <= n, 1 <= y1 <= y2 <= n) changes the matrix by using the rectangle whose upper-left corner is (x1, y1) and lower-right corner is (x2, y2).
2. Q x y (1 <= x, y <= n) querys A[x, y].

Input

The first line of the input is an integer X (X <= 10) representing the number of test cases. The following X blocks each represents a test case.

The first line of each block contains two numbers N and T (2 <= N <= 1000, 1 <= T <= 50000) representing the size of the matrix and the number of the instructions. The following T lines each represents an instruction having the format "Q x y" or "C x1 y1 x2 y2", which has been described above.

Output

For each querying output one line, which has an integer representing A[x, y].

There is a blank line between every two continuous test cases.

Sample Input

1
2 10
C 2 1 2 2
Q 2 2
C 2 1 2 1
Q 1 1
C 1 1 2 1
C 1 2 1 2
C 1 1 2 2
Q 1 1
C 1 1 2 1
Q 2 1

Sample Output

1
0
0
1

Source

POJ Monthly,Lou Tiancheng

题意是给你个矩阵里面开始全是0,然后给你两种指令:1:‘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,;2:‘Q x1 y1‘,输出a[x1][y1]的值。


二维树状数组:对于一个矩阵,迅速修改其一个点的值,迅速求其左上角连续子矩阵的和


#include<map>
#include<string>
#include<cstring>
#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<queue>
#include<vector>
#include<iostream>
#include<algorithm>
#include<bitset>
#include<climits>
#include<list>
#include<iomanip>
#include<stack>
#include<set>
using namespace std;
int bit[1010][1010],n;
void update(int r,int c,int val)
{
	for(int i=r;i<=n;i+=i&-i)
		for(int j=c;j<=n;j+=j&-j)
			bit[i][j]+=val;
}
int psum(int r,int c)
{
	int ans=0;
	for(int i=r;i>0;i-=i&-i)
		for(int j=c;j>0;j-=j&-j)
			ans+=bit[i][j];
	return ans;
}
int main()
{
	int T;
	scanf("%d",&T);
	while(T--)
	{
		int m;
		scanf("%d%d",&n,&m);
		memset(bit,0,sizeof(bit));
		while(m--)
		{
			char s[100];
			scanf("%s",s);
			if(s[0]=='C')
			{
				int r1,c1,r2,c2;
				scanf("%d%d%d%d",&r1,&c1,&r2,&c2);
				update(r1,c1,1);
				update(r1,c2+1,-1);
				update(r2+1,c1,-1);
				update(r2+1,c2+1,1);
			}
			else
			{
				int r,c;
				scanf("%d%d",&r,&c);
				printf("%d\n",psum(r,c)%2);
			}
		}
		puts("");
	}
}


poj2155Matrix

标签:

原文地址:http://blog.csdn.net/stl112514/article/details/45311497

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!