Das 8-Damen Problem

[vpm]

Na dann schnipsel ich mal mit ^^
Hier der C Code für das 8-Damen Problen:

#include <stdio.h>
#include <stdlib.h>

int x[8]; /* x[i] = x coordinate of queen in row i. */

/* prints field */
void print ()
{
int i,j;
printf ("+----------------+\n");
for (i=0; i<8; i++) {
printf ("|");
for (j=0; j<8; j++)
if (j==x[i]) printf ("<>");
else printf (" ");
printf ("|\n");
}
printf ("+----------------+\n\n");
}

/* tests, whether (ix, iy) is beaten by queens 0...(iy-1) */
int is_free (int ix, int iy)
{
int i;
for (i=0; i<iy; i++)
if ((x[i]==ix) || (abs(x[i]-ix)==abs(i-iy))) return 0;
return 1;
}

/* tries to place queen n on row n */
void try (int n)
{
int i;
if (n==8) print();
else
for (i=0; i<8; i++)
if (is_free(i,n)) {
x[n]=i;
try (n+1);
}
}

int main ()
{
try (0);
return 0;
}