bzoj 1024 生日快乐

题目链接:http://www.lydsy.com/JudgeOnline/problem.php?id=1024

题解:

  枚举切开的两块的面积比例,由于每个人分得的面积要相同,所以面积比例的分子、分母都应为整数,还要按横切和纵切两种情况分开深搜

 1 #include<cstdio>
 2 int n,m,k;
 3 inline double max(double x,double y)
 4 {
 5     return x>y?x:y;
 6 }
 7 inline double min(double x,double y)
 8 {
 9     return x<y?x:y;
10 }
11 double dfs(double x,double y,int dep)
12 {
13     if(dep==1)return max(x/y,y/x);
14     double ans=2147483647;
15     for(int i=1;i<=(dep>>1);i++)
16     {
17         double xx=x*i/dep,yy=y*i/dep;
18         ans=min(ans,max(dfs(xx,y,i),dfs(x-xx,y,dep-i)));//纵切 
19         ans=min(ans,max(dfs(x,yy,i),dfs(x,y-yy,dep-i)));//横切 
20     }
21     return ans;
22 }
23 int main()
24 {
25     scanf("%d%d%d",&n,&m,&k);
26     printf("%.6lf",dfs(n,m,k));
27     return 0;
28 }

 

posted @ 2016-10-16 20:24  xqmmcqs  阅读(134)  评论(0编辑  收藏  举报