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Re:这题怎么节省时间，我按照经典的叉积方法实现，却用了500多ms,请问15ms的是怎么搞的？In Reply To:Re:这题怎么节省时间，我按照经典的叉积方法实现，却用了500多ms,请问15ms的是怎么搞的？ Posted by:zouyu9631 at 2006-08-23 22:55:04 scanf("%c", &dir);
dx=(dir-1)%3-1;dy=(dir-1)/3-17;
res += dx*ly-dx*ny;
lx += dx; ly += dy;
if(dir == '5')
break;
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