delete pics to save space

history_source/信息学奥赛一本通/2.7.5.cpp

@@ -0,0 +1,29 @@
+#include<cstdio>
+double a,b,c,d;
+double op(double x)
+{
+	return a*x*x*x+b*x*x+c*x+d;
+}
+int main()
+{
+	scanf("%lf%lf%lf%lf",&a,&b,&c,&d);
+	double le,ri,mid;
+	for(int i=-100;i<=100;i++)
+	{
+		le=i;
+		ri=i+1;
+		if(op(le)==0) printf("%.2lf ",le);
+		else if(op(le)*op(ri)<0)
+		{
+			while(ri-le>=0.001)
+			{
+				mid=(le+ri)/2;
+				if(op(le)*op(mid)<0) ri=mid;
+				else le=mid;
+			}
+			printf("%.2lf ",le);
+		}
+	}
+	printf("\n");
+	return 0;
+}