数独游戏：第一行第一列是5,第五列是2,第二行第八列是1,第三行第九列是3,第四行第二列是6,第三列是1,第四列是7,第五行第七列是5,第八列是2,第六行第二列是3,第七行第一列是8,第三列是4,第七列是2,第八行第四列是6,第六列是3,第七列是4,第九行第四列是1.其余是什么?

答案：
573921648
649835712
128467953
261754389
987316524
435298167
814579236
752683491
396142875
详细步骤：
1: (6,7) = 1 区块摒余
2: (2,9) = 2
3: (9,6) = 2
4: (6,4) = 2
5: (4,1) = 2
6: (7,8) = 3 区块摒余
7: (4,7) = 3
8: (9,5) = 4
9: (3,8) = 5
10: (6,3) = 5
11: (7,9) = 6 区块摒余
12: (6,8) = 6
13: (8,5) = 8
14: (8,9) = 1
15: (7,2) = 1
16: (3,1) = 1
17: (1,6) = 1
18: (5,5) = 1
19: (5,4) = 3
20: (2,5) = 3
21: (1,3) = 3
22: (9,1) = 3
23: (9,9) = 5
24: (8,2) = 5
25: (5,6) = 6
26: (3,5) = 6
27: (9,3) = 6
28: (2,1) = 6
29: (1,7) = 6
30: (7,5) = 7 区块摒余
31: (8,3) = 2
32: (3,2) = 2
33: (2,2) = 4 区块摒余
34: (3,4) = 4 区块摒余
35: (4,5) = 5 行列摒余
36: (6,5) = 9
下面用到候选数法,就不列了.