数独

#include <stdio.h>
#include <string.h>
int map[9][9];
bool row[9][10];
bool col[9][10];
bool block[3][3][10];
bool flag;
void DFS(int x)
{
if(flag)
return;
int r = x / 9;
int c = x % 9;
int i, j;
if(81 == x)
{
for(i = 0; i < 9; i++)
{
for(j = 0; j < 9; j++)
printf("%d ", map[i][j]);
printf("\n");
}
flag = 1;
return;
}
if(0 == map[r][c])
{
for(i = 1; i <= 9; i++)
{
if(!(row[r][i] || col[c][i] || block[r / 3][c / 3][i]))
{
map[r][c] = i;
row[r][i] = col[c][i] = block[r / 3][c / 3][i] = 1;
DFS(x + 1);
row[r][i] = col[c][i] = block[r / 3][c / 3][i] = 0;
map[r][c] = 0;
}
}
}
else
DFS(x + 1);
}
int main()
{
int i, j, n;
scanf("%d", &n);
while(n--)
{
flag = 0;
memset(row, 0, sizeof(row));
memset(col, 0, sizeof(col));
memset(block, 0, sizeof(block));
for(i = 0; i < 9; i++)
{
for(j = 0; j < 9; j++)
{
scanf("%d", &map[i][j]);  //输入9*9矩阵
if(map[i][j])
{
row[i][map[i][j]] = 1;
col[j][map[i][j]] = 1;
block[i/3][j/3][map[i][j]] = 1;
}
}
}
DFS(0);
}
return 0;
}