delete pics to save space

history_source/信息学奥赛一本通/2.7.13.cpp

@@ -0,0 +1,22 @@
+#include<cstdio>
+#include<cmath>
+double pi=acos(-1),lon,lonn,lonx,le=0,ri,mi,deg,h,ans;
+#define d_r(a) (pi/180.0*(a))
+#define r_d(a) (180.0/pi*(a))
+int main()
+{
+	scanf("%lf%lf%lf",&lon,&deg,&h);
+	lonn=(1+deg*h)*lon;
+	ri=d_r(180);
+	if(lon*deg*h==0) {printf("0.000\n");return 0;}
+	while(ri-le>0.00000000001)
+	{
+		mi=(le+ri)/2;
+		lonx=2*((lon/2)/sin(mi/2))*pi*mi/d_r(360);
+		if(lonx>=lonn) ri=mi;
+		else le=mi;
+	}
+	ans=(lon/2)/sin(mi/2)-(lon/2)/tan(mi/2);
+	printf("%.3lf\n",ans);
+	return 0;
+}