delete pics to save space

1.3382.cpp

@@ -0,0 +1,26 @@
+#include<cstdio>
+#include<cmath>
+const double eps=1e-7;
+int n;
+double L,R,M1,M2,v1,v2,a[14];
+inline double cal(double x)
+{
+	double res=0;
+	for(int i=0;i<=n;i++) res=res+a[i]*pow(x,i);
+	return res;
+}
+int main()
+{
+	scanf("%d%lf%lf",&n,&L,&R);
+	for(int i=n;i>=0;i--) scanf("%lf",&a[i]);
+	while(R-L>eps)
+	{
+		M1=(R-L)/3+L; M2=(R-L)/3*2+L;
+		v1=cal(M1); v2=cal(M2);
+		if(v1>v2) R=M2;
+		else if(v1<v2) L=M1;
+		else L=M1,R=M2;
+	}
+	printf("%.5lf\n",L);
+	return 0;
+}