跑完程序就是0.00,0.00和0.00

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
double a,b,c,d;
double judge(double x){
	return x*x*x*a+x*x*b+x*c+d;
}
bool check(double x,double y){
	return (x*x*x*a+x*x*b+x*c+d)*(y*y*y*a+y*y*b+y*c+d)<0;
}
int main(){
	scanf("%lf%lf%lf%lf",&a,&b,&c,&d);
	long long p=judge(-100);
	for(int i=-100;i<=100;++i){
		if(judge(i)==0)  printf("%.2lf ",i);
		if(!p*judge(i)&&judge(i)!=0){
			p=judge(i);
			double l=i-1.00,r=i,mid;
			while(l<=r&&l-r<=0.0001){
				mid=(l+r)/2;
				if(check(mid,r))  l=mid;
				else r=mid-1.00;
			}
			printf("%.2lf ",r);
		}
	}
	return 0;
}