ZOJ-1049 几何算数题
1049:选一坐标点建房。河水淹没区域是半圆形，每年扩大50平方英里。问几年能淹到房子。





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.


简单题。就是比较圆半径和点到原点距离。

#include<stdio.h>#include<iostream>using namespace std;#define PI 3.1415927int main(){int N;double x;double y;int area;int k;cin>>N;for(int i=1;i<=N;i++){cin>>x;cin>>y;area=0;//半圆面积1/2*PI*r*rfor(k=0;;k++){if(2*area/PI>x*x+y*y)break;elsearea+=50;}printf("Property %d: This property will begin eroding in year %d.\n",i,k);}printf("END OF OUTPUT.\n"); }