1049.cpp

zju_acm部分代码！都是自己做 有些事基本题目！题目还可以

#include <cstdio>
#include <math.h>
#define P 3.141592653

int main()
{
	int N;
	int i,j=0;
	float x,y,r;
	scanf("%d",&N);
	while(N--)
	{
		scanf("%f%f",&x,&y);
			r=(float)sqrt(x*x+y*y);
			i=1;
		while(1)
		{
			if(r*r-100/P<0)
			{	
				break;	}
				r=(float)sqrt(r*r-100/P);
			i++;
		}
		j++;
		printf("Property %d: This property will begin eroding in year %d.\n",j,i);
	}

	printf("END OF OUTPUT.");

	return 0;
}