POJ1222 EXTENDED LIGHTS OUT（熄灯问题）

题目链接

Description

In an extended version of the game Lights Out, is a puzzle with 5 rows of 6 buttons each (the actual puzzle has 5 rows of 5 buttons each). Each button has a light. When a button is pressed, that button and each of its (up to four) neighbors above, below, right and left, has the state of its light reversed. (If on, the light is turned off; if off, the light is turned on.) Buttons in the corners change the state of 3 buttons; buttons on an edge change the state of 4 buttons and other buttons change the state of 5. For example, if the buttons marked X on the left below were to be pressed,the display would change to the image on the right. 

The aim of the game is, starting from any initial set of lights on in the display, to press buttons to get the display to a state where all lights are off. When adjacent buttons are pressed, the action of one button can undo the effect of another. For instance, in the display below, pressing buttons marked X in the left display results in the right display.Note that the buttons in row 2 column 3 and row 2 column 5 both change the state of the button in row 2 column 4,so that, in the end, its state is unchanged. 

Note: 
1. It does not matter what order the buttons are pressed. 
2. If a button is pressed a second time, it exactly cancels the effect of the first press, so no button ever need be pressed more than once. 
3. As illustrated in the second diagram, all the lights in the first row may be turned off, by pressing the corresponding buttons in the second row. By repeating this process in each row, all the lights in the first 
four rows may be turned out. Similarly, by pressing buttons in columns 2, 3 ?, all lights in the first 5 columns may be turned off. 
Write a program to solve the puzzle.

Input

The first line of the input is a positive integer n which is the number of puzzles that follow. Each puzzle will be five lines, each of which has six 0 or 1 separated by one or more spaces. A 0 indicates that the light is off, while a 1 indicates that the light is on initially.

Output

For each puzzle, the output consists of a line with the string: "PUZZLE #m", where m is the index of the puzzle in the input file. Following that line, is a puzzle-like display (in the same format as the input) . In this case, 1's indicate buttons that must be pressed to solve the puzzle, while 0 indicate buttons, which are not pressed. There should be exactly one space between each 0 or 1 in the output puzzle-like display.

Sample Input

2
0 1 1 0 1 0
1 0 0 1 1 1
0 0 1 0 0 1
1 0 0 1 0 1
0 1 1 1 0 0
0 0 1 0 1 0
1 0 1 0 1 1
0 0 1 0 1 1
1 0 1 1 0 0
0 1 0 1 0 0

Sample Output

PUZZLE #1
1 0 1 0 0 1
1 1 0 1 0 1
0 0 1 0 1 1
1 0 0 1 0 0
0 1 0 0 0 0
PUZZLE #2
1 0 0 1 1 1
1 1 0 0 0 0
0 0 0 1 0 0
1 1 0 1 0 1
1 0 1 1 0 1

按下（i,j）后（i-1，j），（i+1，j），（i，j-1），（i，j+1）也会被翻转，同一个格子翻转两次就会恢复原状，所以多次翻转是多余的。

先枚举第一行的按法，共2^6种。一旦第一行的按法确定了，为了使第一行的灯全部熄灭，第二行的按法也会确定下来，……，为了使第四行的灯全部熄灭，第五行的按法也会确定下来，最后只要判断最后一行的灯是否全部熄灭即可。

AC代码：

#include<iostream>
#include<sstream>
#include<algorithm>
#include<string>
#include<cstring>
#include<iomanip>
#include<vector>
#include<cmath>
#include<ctime>
#include<stack>
#include<queue>
#define e 2.71828182
#define Pi 3.141592654
using namespace std;
int matrix[6][8]; 
int press[6][8];
int main()
{
    int n,count=1;
    cin>>n;
    while(n--)
    {
        memset(matrix,0,sizeof(matrix));
        for(int i=1;i<=5;i++)
            for(int j=1;j<=6;j++)
                cin>>matrix[i][j];
                
        for(int i=0;i<1<<6;i++) 
        {
            memset(press,0,sizeof(press));
            int num=i;
            for(int j=1;j<=6;j++)//利用二进制枚举第一行按开关的情况
            {
                press[1][6-j+1]=num%2;
                num/=2;
            }
            //第一行开关确定好后为了使第一行的灯都满足条件，第二行开关的按法也就确定了下来
            for(int p=2;p<=5;p++) //确定第二至五行开关的按法
            {
                for(int j=1;j<=6;j++)
                {
                    //matrix[p-1][j]仍未熄灭 
                    if((matrix[p-1][j]+press[p-1][j]+press[p-2][j]+press[p-1][j-1]+press[p-1][j+1])&1)
                        press[p][j]=1;
                }
            } 
            
            for(int j=1;j<=6;j++)//检查第五行的灯是否都熄灭 
            { 
                if((matrix[5][j]+press[5][j]+press[5][j-1]+press[5][j+1]+press[4][j])&1) break;
                else if(j==6)
                {
                    cout<<"PUZZLE #"<<count++<<endl;
                    for(int p=1;p<=5;p++)
                    {
                        for(int q=1;q<=6;q++)
                        cout<<press[p][q]<<' ';
                        cout<<endl;
                    }
                }
            }
        }
    }
}