I Think I Need a Houseboat
http://acm.zju.edu.cn/show_problem.php?pid=1049
1 /*written by czk*/
2 #include <stdio.h>
3 #include <math.h>
4 int main() {
5 int t, i;
6 scanf("%d", &t);
7 for(i = 1; i <= t; i++) {
8 double x, y;
9 scanf("%lf%lf", &x, &y);
10 double square_radius = x*x + y*y;
11 double area = 3.141592653589793 * square_radius * 0.5;
12 printf("Property %d: This property will begin eroding in year %.0f.\n", i, floor(area / 50.0) + 1);
13 }
14 printf("END OF OUTPUT.\n");
15 }