#include <stdio.h>
#include <time.h>
char sd[81];
bool isok = false;
//顯示數獨
void show()
{
if (isok) puts("求解完成");
else puts("初始化完成");
for (int i = 0; i < 81; i++)
{
putchar(sd[i] + '0');
if ((i + 1) % 9 == 0) putchar('\n');
}
putchar('\n');
}
//讀取數獨
bool Init()
{
FILE *fp = fopen("in.txt", "rb");
if (fp == NULL) return false;
fread(sd, 81, 1, fp);
fclose(fp);
for (int i = 0; i < 81; i++)
{
if (sd[i] >= '1' && sd[i] <= '9') sd[i] -= '0';
else sd[i] = 0;
}
show();
return true;
}
//遞歸解決數獨
void force(int k)
{
if (isok) return;
if (!sd[k])
{
for (int m = 1; m <= 9; m++)
{
bool mm = true;
for (int n = 0; n < 9; n++)
{
if ((m == sd[k/27*27+(k%9/3)*3+n+n/3*6]) || (m == sd[9*n+k%9]) || (m == sd[k/9*9+n]))
{
mm = false;
break;
}
}
if (mm)
{
sd[k] = m;
if (k == 80)
{
isok = true;
show();
return;
}
force(k + 1);
}
}
sd[k] = 0;
}
else
{
if (k == 80)
{
isok = true;
show();
return;
}
force(k + 1);
}
}
int main()
{
system("CLS");
if (Init())
{
double start = clock();
force(0);
printf("耗時%.0fms", clock() - start);
}
else puts("初始化錯誤");
getchar();
}