| ||||||||||
| Online Judge | Problem Set | Authors | Online Contests | User | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Web Board Home Page F.A.Qs Statistical Charts | Current Contest Past Contests Scheduled Contests Award Contest | |||||||||
sticksIn Reply To:Re:这题要全搜的 Posted by:first at 2003-11-25 17:55:49 把给定的sticks按长度由大到小排序
先计算出能拼出多少根,然后一根一根的拼,我做了两个函数互相调用
一个是拼下一根,一个是选择一段合适的stick进行填充
void judge(int use)
{
if (use==sticks) //全部拼成
{
flag=1;
return ;
}
for (int i=n-1;i>=0;i--)
if (!d[i]) //stick是否已用过
break;
d[i]=1;
create(p-c[i],use,i); //用没用过的最长的stick来拼下一根
d[i]=0;
}
void create(int q,int use,int next)
{
if (flag)
return ;
if (!q)
{
judge(use+1); //如果剩余长度为0,拼下一根
return ;
}
for (int i=next;i>=0;i--)
if (!d[i]&&q>=c[i]) //如果没用过,并且比剩余长度短
{
d[i]=1;
create(q-c[i],use,i+1); //填充
d[i]=0;
if (flag)
return ;
if (c[i]==q)
return ; //如果剩余部分正好等于
//某stick的长度,则不需要
//用较短的stick进行填充
}
}
Followed by:
Post your reply here: |
All Rights Reserved 2003-2013 Ying Fuchen,Xu Pengcheng,Xie Di
Any problem, Please Contact Administrator