poj1005

水题：题意不懂，是看了别人的解题报告才知道什么意思，鄙视自己的英语

#include<stdio.h>#include<math.h>#include<string.h>#include<algorithm>#include<map>#include<set>#include<queue>#include<vector>#include<iostream>#include<stack>using namespace std;const double pi=3.1415926;int main(void){    int n;    scanf("%d",&n);    for(int i=1;i<=n;i++)    {       double x,y;       scanf("%lf %lf",&x,&y);       double sum=0.0;       double distance=sqrt(x*x+y*y);//距离       double r=0.0;       int cn=0;       while(r<distance)       {         sum+=50.0;         r=sqrt((sum*2.0)/pi);         cn++;       }      printf("Property %d: This property will begin eroding in year %d.\n",i,cn);     if(i==n)       printf("END OF OUTPUT.\n");     }   return 0;}