Extended Lights Out--ZOJ 1354

30192 단어 extend
1. 문제 풀이 사고방식: 욕심, 매거, 비트 연산.
2. 참고 사항:
비트 연산: 주의^,^,<;
귀속: 가지치기 주의;
3. 실현 방법:

  
    
1 #include < iostream >
2 using namespace std;
3 #define ROW 5
4 #define COL 6
5
6 bool isOK;
7
8 int press[ 30 ] = {
9 06040000000 , 07020000000 , 03410000000 , 01604000000 , 0702000000 , 0301000000 ,
10 04060400000 , 02070200000 , 01034100000 , 0416040000 , 0207020000 , 0103010000 ,
11 040604000 , 020702000 , 010341000 , 04160400 , 02070200 , 01030100 ,
12 0406040 , 0207020 , 0103410 , 041604 , 020702 , 010301 ,
13 04060 , 02070 , 01034 , 0416 , 0207 , 0103
14 };
15
16 int pressing[ 30 ] = {
17 04000000000 , 02000000000 , 01000000000 , 0400000000 , 0200000000 , 0100000000 ,
18 040000000 , 020000000 , 010000000 , 04000000 , 02000000 , 01000000 ,
19 0400000 , 0200000 , 0100000 , 040000 , 020000 , 010000 ,
20 04000 , 02000 , 01000 , 0400 , 0200 , 0100 ,
21 040 , 020 , 010 , 04 , 02 , 01
22 };
23
24 int Init()
25 {
26 int i,j,n,data = 0 ;
27 for (i = 0 ;i < ROW;i ++ )
28 {
29 for (j = 0 ;j < COL;j ++ )
30 {
31 cin >> n;
32 data <<= 1 ;
33 data += n;
34 }
35 }
36 return data;
37 }
38
39 void Print( int data)
40 {
41 int i,j;
42 for (i = 0 ;i < ROW;i ++ )
43 {
44 for (j = 0 ;j < COL;j ++ )
45 {
46 if ( (data & pressing[i * COL + j]) == 0 )
47 cout << 0 ;
48 else
49 cout << 1 ;
50 if ( j < COL - 1 )
51 cout << ' ' ;
52 }
53 cout << endl;
54 }
55 }
56
57 void Search( int data, int preState)
58 {
59 int i,j;
60 for (i = 1 ;i < ROW;i ++ )
61 {
62 for (j = 0 ;j < COL;j ++ )
63 {
64 if ( (data & pressing[(i - 1 ) * COL + j]) != 0 )
65 {
66 data ^= press[i * COL + j];
67 preState += pressing[i * COL + j];
68 }
69 }
70 }
71 if (data == 0 )
72 {
73 Print(preState);
74 isOK = true ;
75 }
76 }
77
78 void Do( int data, int x, int preState)
79 {
80 //
81 if ( isOK )
82 {
83 return ;
84 }
85 Search(data,preState);
86 //
87 if ( x == COL )
88 return ;
89 Do(data,x + 1 ,preState);
90 Do(data ^ press[x],x + 1 ,preState ^ pressing[x]);
91 }
92
93 int main()
94 {
95 int i,m;
96 cin >> m;
97 int data;
98 for (i = 1 ;i <= m;i ++ )
99 {
100 cout << " PUZZLE # " << i << endl;
101 data = Init();
102 isOK = false ;
103 Do(data, 0 , 0 );
104 }
105 return 0 ;
106 }

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