I Think I Need a Houseboat
Time Limit: |
Memory Limit: |
|
Total Submissions: |
Accepted: |
Description
Fred Mapper is
considering purchasing some land in Louisiana to build his house
on. In the process of investigating the land, he learned that the
state of Louisiana is actually shrinking by 50 square miles each
year, due to erosion caused by the Mississippi River. Since Fred is
hoping to live in this house the rest of his life, he needs to know
if his land is going to be lost to
erosion.
After doing more research, Fred has learned that the land that is being lost forms a semicircle. This semicircle is part of a circle centered at (0,0), with the line that bisects the circle being the X axis. Locations below the X axis are in the water. The semicircle has an area of 0 at the beginning of year 1. (Semicircle illustrated in the Figure.)
After doing more research, Fred has learned that the land that is being lost forms a semicircle. This semicircle is part of a circle centered at (0,0), with the line that bisects the circle being the X axis. Locations below the X axis are in the water. The semicircle has an area of 0 at the beginning of year 1. (Semicircle illustrated in the Figure.)
Input
The first line of
input will be a positive integer indicating how many data sets will
be included (N). Each of the next N lines will contain the X and Y
Cartesian coordinates of the land Fred is considering. These will
be floating point numbers measured in miles. The Y coordinate will
be non-negative. (0,0) will not be given.
Output
For each data set, a
single line of output should appear. This line should take the form
of: “Property N: This property will begin eroding in year Z.” Where
N is the data set (counting from 1), and Z is the first year (start
from 1) this property will be within the semicircle AT THE END OF
YEAR Z. Z must be an integer. After the last data set, this should
print out “END OF OUTPUT.”
Sample Input
2
1.0 1.0
25.0 0.0
Sample Output
Property 1: This property will begin eroding in year 1.
Property 2: This property will begin eroding in year 20.
END OF OUTPUT.
#include
#include
double PI=3.1415926;
int main()
{
int k,count=1;
double s,x,y;
scanf("%d",&k);
while(k--)
{
scanf("%lf%lf",&x,&y);
s=(PI/2)*(x*x+y*y);
printf("Property %d: This property will begin eroding in year %d. ",count++,(int) (s/(double)50+1));//注意数据的类型
}
printf("END OF OUTPUT. ");
return 0;
}