Sudoku
| Time Limit: 2000MS |
| Memory Limit: 65536K | ||
| Total Submissions: 9679 |
| Accepted: 4791 |
| Special Judge |
Description
Sudoku is a very simple task. A square table with 9 rows and 9 columns is divided to 9 smaller squares 3x3 as shown on the Figure. In some of the cells are written decimal digits from 1 to 9. The other cells are empty. The goal is to fill the empty cells with decimal digits from 1 to 9, one digit per cell, in such way that in each row, in each column and in each marked 3x3 subsquare, all the digits from 1 to 9 to appear. Write a program to solve a given Sudoku-task.
Input
The input data will start with the number of the test cases. For each test case, 9 lines follow, corresponding to the rows of the table. On each line a string of exactly 9 decimal digits is given, corresponding to the cells in this line. If a cell is empty it is represented by 0.
Output
For each test case your program should print the solution in the same format as the input data. The empty cells have to be filled according to the rules. If solutions is not unique, then the program may print any one of them.
Sample Input
1
103000509
002109400
000704000
300502006
060000050
700803004
000401000
009205800
804000107
Sample Output
143628579
572139468
986754231
391542786
468917352
725863914
237481695
619275843
854396127
求解速度,题目应该都懂,一下是代码,求指点:
[cpp] view plaincopy
1. #include <iostream>
2. using namespace std;
3. int map[10][10],count1;
4. bool row[10][10],coloumn[10][10],cr[10][10];//用来标记行,竖,小方格
5. struct p
6. {
7. int x,y;
8. }point[100];//标记每个格子的横纵坐标
9. int cxbfine(int i,int j)//规定每个3*3方格的号码
10. {
11. return ((i-1)/3)*3+(j-1)/3;
12. }
13. int dfs(int n)//进行深搜,符合条件往下,填不下就回溯
14. {
15. if(n>count1)
16. return 1;
17. for(int i=1;i<=9;i++)
18. if(!row[point[n].x][i] && !coloumn[point[n].y][i] && !cr[cxbfine(point[n].x,point[n].y)][i])
19. {
20. row[point[n].x][i]=true;
21. coloumn[point[n].y][i]=true;
22. cr[cxbfine(point[n].x,point[n].y)][i]=true;
23. map[point[n].x][point[n].y]=i;
24. if(dfs(n+1))
25. return 1;
26. row[point[n].x][i]=false;
27. coloumn[point[n].y][i]=false;
28. cr[cxbfine(point[n].x,point[n].y)][i]=false;
29. }
30. return 0;
31. }
32. int main()
33. {
34. int n,i,j;
35. cin>>n;
36. while(n--)
37. {
38. count1=0;
39. memset(row,false,sizeof(row));
40. memset(coloumn,false,sizeof(coloumn));
41. memset(cr,false,sizeof(cr));
42. for(i=1;i<=9;i++)//输入并判断
43. for(j=1;j<=9;j++)
44. {
45. scanf("%1d",&map[i][j]);
46. if(map[i][j])
47. {
48. row[i][map[i][j]]=true;
49. coloumn[j][map[i][j]]=true;
50. cr[cxbfine(i,j)][map[i][j]]=true;
51. }
52. else
53. {
54. count1++;
55. point[count1].x=i;
56. point[count1].y=j;
57. }
58. }
59. dfs(1);
60. for(i=1;i<=9;i++)
61. {
62. for(j=1;j<=9;j++)
63. cout<<map[i][j];
64. cout<<endl;
65. }
66. }
67. return 0;
68. }

本文介绍了一种使用深度优先搜索解决数独问题的算法。通过标记已填充数字的行列及3x3宫格,实现对空缺位置的有效填充。代码实现了输入测试案例,并通过递归调用完成数独求解。
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