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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:
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