2986 Land loss
题目描述
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.)
输入格式:
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.
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.
输出格式:
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."
"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."
输入样例 复制
2 1.0 1.0 25.0 0.0
输出样例
复制
Property 1: This property will begin eroding in year 1. Property 2: This property will begin eroding in year 20. END OF OUTPUT.
说明
无提示
---------------------------------------嘘~小声点---------------------------------------
题意：
一个小岛，以原点为中心，每年侵蚀速度为50平方公里,出房子的坐标。
问，第几年会危及到房子的安全？
注意：如果理解题意后先自行思考，无思路后继续往下看
---------------------------------------请根据题解认真理解以及【审核代码】后提交---------------------------------------
以下代码由于整理时出了错，格式完全乱套了（我会和你说我是故意的吗~嘿嘿）。以后写代码要养成良好的编码习惯-保证代码格式工整哦！
请整理好代码格式后，仔细【审核代码】后提交。
---------------------------------------嘘~小声点---------------------------------------
题意：
一个小岛，以原点为中心，每年侵蚀速度为50平方公里,出房子的坐标。
问，第几年会危及到房子的安全？
注意：如果理解题意后先自行思考，无思路后继续往下看
---------------------------------------请根据题解认真理解以及【审核代码】后提交---------------------------------------
以下代码由于整理时出了错，格式完全乱套了（我会和你说我是故意的吗~嘿嘿）。以后写代码要养成良好的编码习惯-保证代码格式工整哦！
请整理好代码格式后，仔细【审核代码】后提交。
/*****
题解：
根据房子坐标与原点为半径，原点为圆心做一个圆，算出面积之后将它除以五十，因为侵蚀速度是每年50平方英里，算出最大年限
floor 返回不大于x的最大整数(向下取整)
ceil 返回大于x的最小整数(向上取整)
*****/
#include "stdio.h"
#include "math.h"
#define N 3.1415926
int main(){int i,j,k,;double x,y,r,area;scanf("%d",&i);//i行数据
for(j=1;j<=i;j++){ scanf("%lf %lf",&x,&y);//房子坐标
r=sqrt(pow(x,2)+pow(y,2));//求出半径
area=pow(r,2)*N/2;//算出圆的面积
printf("Property %d: This property will begin eroding in year %d\n",j,(int)ceil(area/50.0));}
printf("END OF OUTPUT.\n");return 0;}
