zoj 1105 FatMouse‘s Tour

#include
#include
#include
#include
#include
#include
#include
#include
using namespace std;

int main() {
	double x0, y0;
	while (cin >> x0 >> y0) {
		string x1;
		double y1, x2, y2;
		double sum = 0;
		while (cin >> x1 && x1 != "java") {
			cin >> y1 >> x2 >> y2;
			double dx = x2 - stod(x1);
			double dy = y2 - y1;
			sum += sqrt(dy * dy + dx * dx);
//			cout << "sum:" << sum << endl;
		}
		sum = sum / 1000 * 2 / 20;
//		cout << sum<