Strange fuction HDU

Miku

三分答案这东西，非常好理解

#include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
int n;
double y;
double xz=1e-7;//修正精度 
double lm,rm;
double v(double x){
	return 6*x*x*x*x*x*x*x+8*x*x*x*x*x*x+7*x*x*x+5*x*x-y*x;
}
double sf(double l,double r){
	while(l+xz<r){
		lm=l+(r-l)*0.3;//这个数随便选 
		rm=l+(r-l)*0.7;
		if(v(lm)<v(rm))
			r=rm;
		else
			l=lm;
	}
	return v(l);
}
int main(){
	cin>>n;
	for(int i=1;i<=n;++i){
		scanf("%lf",&y);
		printf("%.4lf
",sf(0.0,100.0));
	}
}