N皇后问题
#include <stdio.h>
static int upperlim, sum;
void binqueen(int row, int ld, int rd)
{
int pos, p;
if(row != upperlim)
{
pos = upperlim & ~(row | ld | rd);
while (pos)
{
p = pos & -pos;
pos -= p;
binqueen(row+p, (ld+p)<<1, (rd+p)>>1);
}
}
else sum++;
}
int main(void)
{
int n;
scanf("%d", &n);
upperlim = (1<<n) - 1;
binqueen(0, 0, 0);
printf("%d", sum);
return 0;
}
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