【POJ1005】I Think I Need a Houseboat

说是计算几何，其实是一道水题。直接算半圆面积即可。

 #include <iostream>
 #include <cstdlib>
 #include <cstdio>
 #include <cstring>
 #include <cctype>
 #include <numeric>
 #include <cmath>
 #include <algorithm>

 #define PI acos(-1)

 using namespace std;
 int main () {
     //cout << PI << endl;
     ios :: sync_with_stdio(false);
     int T; cin >> T;
     int cnt = ;
     while (T --) {
         double x, y;
         cin >> x >> y;
         double S = 0.5 * (x * x + y * y) * PI / 50.0;
         //cout << S << endl;
         int ans = ceil(S);
         printf ("Property %d: This property will begin eroding in year %d.\n", ++ cnt, ans);
         if (T == ) {
             printf ("END OF OUTPUT.\n");
         }
     }
     return ;
 }