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| #include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <algorithm>
#include <sstream>
#include <map>
#include <set>
#include <cmath>
#define REP(i,k,n) for(int i=k;i<n;i++)
#define rep(i,n) for(int i=0;i<n;i++)
#define INF 1<<30
#define pb push_back
#define mp make_pair
#define EPS 1e-8
#define equals(a,b) fabs((a) - (b)) < EPS
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
struct Point {
double x, y;
Point(double x=0, double y=0) : x(x), y(y) {}
Point operator+(const Point &o) const { return Point(x+o.x, y+o.y); }
Point operator-(const Point &o) const { return Point(x-o.x, y-o.y); }
Point operator*(const double m) const { return Point(x*m, y*m); }
Point operator/(const double d) const { return Point(x/d, y/d); }
bool operator<(const Point &o) const { return x != o.x ? x < o.x : y < o.y; }
bool operator==(const Point &o) const { return fabs(x-o.x) < EPS && fabs(y-o.y) < EPS; }
double cross(const Point &o) const { return x * o.y - y * o.x; }
double dot(const Point &o) const { return x * o.x + y * o.y; }
double atan() const { return atan2(y, x); }
double norm() const { return sqrt(dot(*this)); }
double distance(const Point &o) const { return (o - (*this)).norm(); }
double area(const Point &a,const Point &b) {
Point p = a - (*this), p2 = b - (*this);
return p.cross(p2);
}
double area_abs(const Point &a,const Point &b) const {
Point p = a - (*this), p2 = b - (*this);
return fabs(p.cross(p2)) / 2.0;
}
//線分abが自身に含まれているのかどうか判断する
int between(const Point &a,const Point &b) {
if(area(a,b) != 0) return 0;
if(a.x != b.x) return ((a.x <= x) && (x <= b.x) || (a.x >= x) && (x >= b.x));
else return ((a.y <= y) && (y <= b.y) || (a.y >= y) && (y >= b.y));
}
double distance_seg(const Point& a,const Point& b) {
if((b-a).dot(*this-a) < EPS) {
return (*this-a).norm();
}
if((a-b).dot(*this-b) < EPS) {
return (*this-b).norm();
}
return abs((b-a).cross(*this-a)) / (b-a).norm();
}
bool hitPolygon(const Point& a,const Point& b,const Point& c) {
double t = (b-a).cross(*this-b);
double t2 = (c-b).cross(*this-c);
double t3 = (a-c).cross(*this-a);
if((t > 0 && t2 > 0 && t3 > 0) || ( t < 0 && t2 < 0 && t3 < 0)) {
return true;
}
return false;
}
};
struct Circle {
Point p;
double r;
Circle() : p(Point(0,0)), r(0) {}
Circle(Point o, double r) : p(o), r(r) {}
Circle(double x,double y, double r) : p(Point(x,y)), r(r) {}
bool isCircleIn(const Point& o) {
Point res = o-p;
return res.dot(res) < r*r + EPS;
}
// 1:外で接する，0:交差なし，-1:内で接する，2:交差，-2:内包
int isIntersect(const Circle& c) {
double d = (c.p - p).dot(c.p - p);
double len = (c.r + r) * (c.r + r);
if(equals(d,len)) return 1;
if(d > len) return 0;
double R = fabs(c.r - r) * fabs(c.r - r);
if(equals(d,R)) return -1;
if(d > R) return 2;
return -2;
}
vector<Point> getCrossPoint(const Circle& c) {
vector<Point> ret;
int ch = isIntersect(c);
if(ch == 0 || ch == -2) return ret;
Point base = c.p - p;
double len = base.dot(base);
double t = (r*r - c.r*c.r + len) / (2.0 * len);
if(ch == 2) {
Point n(-base.y,base.x);
n = n / (n.norm());
double h = sqrt(r * r - t*t*len);
ret.push_back(p + (base*t) + (n*h));
ret.push_back(p + (base*t) - (n*h));
} else {
ret.push_back(p + (base*t));
}
return ret;
}
};
int main() {
int n,m;
while(cin >> n && n) {
vector<Circle> v;
rep(i,n) {
double x,y,r;
cin >> x >> y >> r;
v.push_back(Circle(x,y,r));
}
int m;
cin >> m;
rep(q,m) {
Point t,o;
cin >> t.x >> t.y >> o.x >> o.y;
bool flag = true;
rep(i,n) {
if(v[i].isCircleIn(t) && v[i].isCircleIn(o)) {
continue;
} else if(!v[i].isCircleIn(t) && !v[i].isCircleIn(o)) {
double d = v[i].p.distance_seg(t,o);
if(d < v[i].r + EPS) flag = false;
} else {
flag = false;
}
}
if(flag) cout << "Danger" << endl;
else cout << "Safe" << endl;
}
}
return 0;
}
|
