[bzoj]1024: [SCOI2009]生日快乐

直接暴力求答案，听说标准解法是二分最小值？

#include <cstdio>
#include <algorithm>
using namespace std;
int x,y,n;
double dfs(double x,double y,int n)
{
register int i;
if (n==1) return (x>y)?(x/y):(y/x);
double ans=100000;
for (i=1;i<=n/2;i++)
ans=min(ans,min(max(dfs(x/n*i,y,i),dfs(x/n*(n-i),y,n-i)),max(dfs(x,y/n*i,i),dfs(x,y/n*(n-i),n-i))));
return ans;
}
int main()
{
scanf("%d %d %d",&x,&y,&n);
printf("%.6lf",dfs(x,y,n));
}