-
Notifications
You must be signed in to change notification settings - Fork 0
/
sudoku.cpp
114 lines (102 loc) · 1.83 KB
/
sudoku.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
#include<iostream>
using namespace std;
bool inRow(int g[][9],int row,int num)
{
for(int col=0;col<9;col++)
if(g[row][col] == num)
return true;
cout<<"\n"<<row<<" InRow";
return false;
}
bool inCol(int g[][9],int col,int num)
{
for(int row=0;row<9;row++)
if(g[row][col] == num)
return true;
cout<<"\n"<<col<<" InCol";
return false;
}
bool inBox(int g[][9],int row,int col,int num)
{
for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
if(g[row+i][col+j] == num)
return true;
}
}
cout<<"\n"<<row<<" "<<col<<" InBox";
return false;
}
void print_(int g[][9])
{
for(int i=0;i<9;i++)
{
for(int j=0;j<9;j++)
cout<<g[i][j]<<" ";
cout<<endl;
}
}
bool safe(int g[][9],int row,int col,int num)
{
return (!inRow(g,row,num) && !inCol(g,col,num) && !inBox(g,row-row%3,col-col%3,num));
}
bool empty_cell(int g[][9],int &row,int &col)
{
for(row=0;row<9;row++)
for(col=0;col<9;col++)
if(g[row][col]==0)
return true;
return false;
}
bool sudoku(int g[][9])
{
int row,col;
//done
if(!empty_cell(g,row,col))
return true;
for(int num = 1;num<=9;num++)
{
if(safe(g,row,col,num))
{
g[row][col] = num;
if(sudoku(g))
return true;
g[row][col] = 0;
}
}
return false;
}
bool check_sudoku(int g[][9])
{
for(int i=0;i<9;i++)
{
for(int j=0;j<9;j++)
{
if(safe(g,i,j,g[i][j]))
return false;
}
}
return true;
}
main()
{
int grid[][9] = {{3, 0, 6, 5, 0, 8, 4, 0, 0},
{5, 2, 0, 0, 0, 0, 0, 0, 0},
{0, 8, 7, 0, 0, 0, 0, 3, 1},
{0, 0, 3, 0, 1, 0, 0, 8, 0},
{9, 0, 0, 8, 6, 3, 0, 0, 5},
{0, 5, 0, 0, 9, 0, 6, 0, 0},
{1, 3, 0, 0, 0, 0, 2, 5, 0},
{0, 0, 0, 0, 0, 0, 0, 7, 4},
{0, 0, 5, 2, 0, 6, 3, 0, 0}};
if(sudoku(grid))
print_(grid);
else
cout<<"\nNo sol";
if(check_sudoku(grid))
cout<<"\nSolved correctly!";
else
cout<<"\nNope;";
}