【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。

 1 #include <iostream>
 2 #include <cstdlib>
 3 #include <cstdio>
 4 #include <cstring>
 5 #include <cctype>
 6 #include <numeric>
 7 #include <cmath>
 8 #include <algorithm>
 9
10 #define PI acos(-1)
11
12 using namespace std;
13 int main () {
14     //cout << PI << endl;
15     ios :: sync_with_stdio(false);
16     int T; cin >> T;
17     int cnt = 0;
18     while (T --) {
19         double x, y;
20         cin >> x >> y;
21         double S = 0.5 * (x * x + y * y) * PI / 50.0;
22         //cout << S << endl;
23         int ans = ceil(S);
24         printf ("Property %d: This property will begin eroding in year %d.\n", ++ cnt, ans);
25         if (T == 0) {
26             printf ("END OF OUTPUT.\n");
27         }
28     }
29     return 0;
30 }