ZOJ Problem Set - 1049 I Think I Need a Houseboat

ZOJ Problem Set - 1049

I Think I Need a Houseboat

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Time Limit: 2 Seconds                                     Memory Limit: 65536 KB                            

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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.)

Input Format:

  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 Format:

  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.��

Notes:

  1. No property will appear exactly on the semicircle boundary: it will either   be inside or outside.

  2. This problem will be judged automatically. Your answer must match exactly,   including the capitalization, punctuation, and white-space. This includes the   periods at the ends of the lines.

  3. All locations are given in miles.

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.

AC代码：

#include<iostream>
#include<stdio.h>
using namespace std;
int main()
{
 int cas;
 int count=0;
 cin>>cas;
 while(cas--)
 {
  float x,y;
  count++;
  cin>>x>>y;
  int r=(int )(x*x+y*y)*3.1415/100+1;
  cout<<"Property "<<count<<": This property will begin eroding in year "<<r<<"."<<endl;
  if(cas==0)
  {
   cout<<"END OF OUTPUT."<<endl;
  }
 }
}