BZOJ1024: [SCOI2009]生日快乐

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cstdlib>
using namespace std;

double dfs(double x,double y,int a)
{
double ans1,ans2,ans=9999999;
int i;
if (a==1)
{
if (x<y) swap(x,y);
return x/y;
}
for (i=1;i<a;i++)
{
ans1=max(dfs(x/a*(a-i),y,a-i),dfs(x/a*i,y,i));
ans2=max(dfs(x,y/a*(a-i),a-i),dfs(x,y/a*i,i));
ans=min(ans,min(ans1,ans2));
}
return ans;
}

int main()
{
int x,y,n;
scanf("%d%d%d",&x,&y,&n);
printf("%.6lf",dfs(x,y,n));
}