标签：poj java
I Think I Need a Houseboat
| Time Limit: 1000MS |
|
Memory Limit: 10000K |
| Total Submissions: 91222 |
|
Accepted: 39632 |
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.)
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.
import java.util.Scanner;
public class Poj1005 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
for (int i = 0; i < n; i++) {
float x = sc.nextFloat();
float y = sc.nextFloat();
for (int j = 1; j <= 100; j++) {
int result = compare(x, y, j);
if (result == -1) {
// find it
System.out.println("Property " + (i+1)
+ ": This property will begin eroding in year " + j
+ ".");
break;
}
}
}
System.out.println("END OF OUTPUT.");
}
/**
* 返回-1说明a和b的平方根比半径小 返回0说明a和b的平方根和半径相等 返回1说明a和b的平方根比半径大
*/
private static int compare(float a, float b, int n) {
double tempVal = a*a + b*b;
//注意这里是半圆
double tempVal2 = (50*2) * n / Math.PI;
if (tempVal < tempVal2) {
return -1;
} else if (tempVal == tempVal2) {
return 0;
} else {
return 1;
}
}
}
POJ 1005
标签：poj java
原文地址：http://blog.csdn.net/bear_huangzhen/article/details/45092203
