#include<stdio.h> #include<string.h> #include<algorithm> #include<math.h> #define PI 3.1415926 using namespace std; int main() { int n,t; double x,y,k; scanf("%d",&n); for(int i=1;i<=n;i++) { scanf("%lf%lf",&x,&y); k=(PI*(x*x+y*y))/100.+0.499; printf("Property %d: This property will begin eroding in year %.0lf. ",i,k); } printf("END OF OUTPUT. "); return 0; }
思路很简单 计算给定点到原点的距离,,算面积 主要是精度的控制