delete pics to save space

history_source/信息学奥赛一本通/1.3.3.cpp

@@ -0,0 +1,16 @@
+#include<cstdio>
+using namespace std;
+double f(double x)
+{
+	if(x>=0&&x<5) return -x+2.5;
+	if(x>=5&&x<10) return 2-1.5*(x-3)*(x-3);
+	if(x>=10&&x<20) return x/2.0-1.5;
+}
+int main()
+{
+	double n;
+	scanf("%lf",&n);
+	printf("%lf\n",f(n));
+	return 0;
+}
+