blob: 40c26350b761282137962307a78bd6648e4f5404 (
plain) (
blame)
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
|
int printf();
int *calloc();
int N;
int *t;
print() {
int x;
int y;
for (y=0; y<8; y++) {
for (x=0; x<8; x++)
if (t[x + 8*y])
printf(" Q");
else
printf(" .");
printf("\n");
}
printf("\n");
}
chk(int x, int y) {
int i;
int r;
for (r=i=0; i<8; i++) {
r = r + t[x + 8*i];
r = r + t[i + 8*y];
if (x+i < 8 & y+i < 8)
r = r + t[x+i + 8*(y+i)];
if (x+i < 8 & y-i >= 0)
r = r + t[x+i + 8*(y-i)];
if (x-i >= 0 & y+i < 8)
r = r + t[x-i + 8*(y+i)];
if (x-i >= 0 & y-i >= 0)
r = r + t[x-i + 8*(y-i)];
}
return r;
}
go(int n, int x, int y) {
if (n == 8) {
print();
N++;
return 0;
}
for (; y<8; y++) {
for (; x<8; x++)
if (chk(x, y) == 0) {
t[x + 8*y]++;
go(n+1, x, y);
t[x + 8*y]--;
}
x = 0;
}
}
main() {
t = calloc(64, sizeof(int));
go(0, 0, 0);
printf("found %d solutions\n", N);
}
|
