#276623 (C++14) No.724 円と円の間の円

提出ソース
結果

問題	No.724 円と円の間の円
ユーザー	beet
提出日時	2018-08-03 23:14:40
言語	C++14 (gcc 12.3.0 + boost 1.83.0)
結果	AC
実行時間	103 ms / 2,000 ms
コード長	16,378 bytes
コンパイル時間	3,828 ms
コンパイル使用メモリ	222,936 KB
実行使用メモリ	5,376 KB
最終ジャッジ日時	2024-09-19 17:39:55
合計ジャッジ時間	4,853 ms
ジャッジサーバーID （参考情報）	judge1 / judge4
このコードへのチャレンジ
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テストケース

テストケース表示
入力	結果	実行時間実行使用メモリ
testcase_00	AC	70 ms 5,248 KB
testcase_01	AC	53 ms 5,376 KB
testcase_02	AC	30 ms 5,376 KB
testcase_03	AC	6 ms 5,376 KB
testcase_04	AC	53 ms 5,376 KB
testcase_05	AC	44 ms 5,376 KB
testcase_06	AC	30 ms 5,376 KB
testcase_07	AC	19 ms 5,376 KB
testcase_08	AC	47 ms 5,376 KB
testcase_09	AC	45 ms 5,376 KB
testcase_10	AC	51 ms 5,376 KB
testcase_11	AC	46 ms 5,376 KB
testcase_12	AC	54 ms 5,376 KB
testcase_13	AC	40 ms 5,376 KB
testcase_14	AC	47 ms 5,376 KB
testcase_15	AC	13 ms 5,376 KB
testcase_16	AC	36 ms 5,376 KB
testcase_17	AC	48 ms 5,376 KB
testcase_18	AC	32 ms 5,376 KB
testcase_19	AC	28 ms 5,376 KB
testcase_20	AC	2 ms 5,376 KB
testcase_21	AC	3 ms 5,376 KB
testcase_22	AC	44 ms 5,376 KB
testcase_23	AC	103 ms 5,376 KB
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ソースコード

raw source code
#include<bits/stdc++.h>
using namespace std;
using Int = long long;

struct Precision{
  Precision(){
    cout<<fixed<<setprecision(12);
  }
}precision_beet;



#define EPS (1e-10)
#define equals(a,b) (fabs((a)-(b)) < EPS)
#define PI 3.141592653589793238
 
// COUNTER CLOCKWISE
static const Int CCW_COUNTER_CLOCKWISE = 1;
static const Int CCW_CLOCKWISE = -1;
static const Int CCW_ONLINE_BACK = 2;
static const Int CCW_ONLINE_FRONT = -2;
static const Int CCW_ON_SEGMENT = 0;

//Intercsect Circle & Circle
static const Int ICC_SEPERATE = 4;
static const Int ICC_CIRCUMSCRIBE = 3;
static const Int ICC_INTERSECT = 2;
static const Int ICC_INSCRIBE = 1;
static const Int ICC_CONTAIN = 0;

struct Point{
  double x,y;
  Point(){}
  Point(double x,double y) :x(x),y(y){}
  Point operator+(Point p) {return Point(x+p.x,y+p.y);}
  Point operator-(Point p) {return Point(x-p.x,y-p.y);}
  Point operator*(double k){return Point(x*k,y*k);}
  Point operator/(double k){return Point(x/k,y/k);}
  double norm(){return x*x+y*y;}
  double abs(){return sqrt(norm());}

  bool operator < (const Point &p) const{
    return x!=p.x?x<p.x:y<p.y;
    //grid-point only
    //return !equals(x,p.x)?x<p.x:!equals(y,p.y)?y<p.y:0;
  }

  bool operator == (const Point &p) const{
    return fabs(x-p.x)<EPS && fabs(y-p.y)<EPS;
  }
};

struct EndPoint{
  Point p;
  Int seg,st;
  EndPoint(){}
  EndPoint(Point p,Int seg,Int st):p(p),seg(seg),st(st){}
  bool operator<(const EndPoint &ep)const{
    if(p.y==ep.p.y) return st<ep.st;
    return p.y<ep.p.y;
  }
};

istream &operator >> (istream &is,Point &p){
  is>>p.x>>p.y;
  return is;
}

ostream &operator << (ostream &os,Point p){
  os<<fixed<<setprecision(12)<<p.x<<" "<<p.y;
  return os;
}

bool sort_x(Point a,Point b){
  return a.x!=b.x?a.x<b.x:a.y<b.y;
}

bool sort_y(Point a,Point b){
  return a.y!=b.y?a.y<b.y:a.x<b.x;
}

typedef Point Vector;
typedef vector<Point> Polygon;

istream &operator >> (istream &is,Polygon &p){
  for(Int i=0;i<(Int)p.size();i++) cin>>p[i];
  return is;
}

struct Segment{
  Point p1,p2;
  Segment(){}
  Segment(Point p1, Point p2):p1(p1),p2(p2){}
};
typedef Segment Line;

istream &operator >> (istream &is,Segment &s){
  is>>s.p1>>s.p2;
  return is;
}

struct Circle{
  Point c;
  double r;
  Circle(){}
  Circle(Point c,double r):c(c),r(r){}
};

istream &operator >> (istream &is,Circle &c){
  is>>c.c>>c.r;
  return is;
}

double norm(Vector a){
  return a.x*a.x+a.y*a.y;
}
double abs(Vector a){
  return sqrt(norm(a));
}
double dot(Vector a,Vector b){
  return a.x*b.x+a.y*b.y;
}
double cross(Vector a,Vector b){
  return a.x*b.y-a.y*b.x;
}

Point orth(Point p){return Point(-p.y,p.x);}

bool isOrthogonal(Vector a,Vector b){
  return equals(dot(a,b),0.0);
}

bool isOrthogonal(Point a1,Point a2,Point b1,Point b2){
  return isOrthogonal(a1-a2,b1-b2);
}

bool isOrthogonal(Segment s1,Segment s2){
  return equals(dot(s1.p2-s1.p1,s2.p2-s2.p1),0.0);
}

bool isParallel(Vector a,Vector b){
  return equals(cross(a,b),0.0);
}

bool isParallel(Point a1,Point a2,Point b1,Point b2){
  return isParallel(a1-a2,b1-b2);
}

bool isParallel(Segment s1,Segment s2){
  return equals(cross(s1.p2-s1.p1,s2.p2-s2.p1),0.0); 
}

Point project(Segment s,Point p){
  Vector base=s.p2-s.p1;
  double r=dot(p-s.p1,base)/norm(base);
  return s.p1+base*r;
}

Point reflect(Segment s,Point p){
  return p+(project(s,p)-p)*2.0;
}

double arg(Vector p){
  return atan2(p.y,p.x);
}

Vector polar(double a,double r){
  return Point(cos(r)*a,sin(r)*a);
}

Int ccw(Point p0,Point p1,Point p2);
bool intersectSS(Point p1,Point p2,Point p3,Point p4);
bool intersectSS(Segment s1,Segment s2);
bool intersectPS(Polygon p,Segment l);
Int intersectCC(Circle c1,Circle c2);
bool intersectSC(Segment s,Circle c);
double getDistanceLP(Line l,Point p);
double getDistanceSP(Segment s,Point p);
double getDistanceSS(Segment s1,Segment s2);
Point getCrossPointSS(Segment s1,Segment s2);
Point getCrossPointLL(Line l1,Line l2);
Polygon getCrossPointCL(Circle c,Line l);
Polygon getCrossPointCC(Circle c1,Circle c2);
Int contains(Polygon g,Point p);
Polygon andrewScan(Polygon s);
Polygon convex_hull(Polygon ps);
double diameter(Polygon s);
bool isConvex(Polygon p);
double area(Polygon s);
Polygon convexCut(Polygon p,Line l);
Line bisector(Point p1,Point p2);
Vector translate(Vector v,double theta);
vector<Line> corner(Line l1,Line l2);
vector<vector<pair<Int, double> > >
segmentArrangement(vector<Segment> &ss, Polygon &ps);
  
Int ccw(Point p0,Point p1,Point p2){
  Vector a = p1-p0;
  Vector b = p2-p0;
  if(cross(a,b) > EPS) return CCW_COUNTER_CLOCKWISE;
  if(cross(a,b) < -EPS) return CCW_CLOCKWISE;
  if(dot(a,b) < -EPS) return CCW_ONLINE_BACK;
  if(a.norm()<b.norm()) return CCW_ONLINE_FRONT;
  return CCW_ON_SEGMENT;
}

bool intersectSS(Point p1,Point p2,Point p3,Point p4){
  return (ccw(p1,p2,p3)*ccw(p1,p2,p4) <= 0 &&
	  ccw(p3,p4,p1)*ccw(p3,p4,p2) <= 0 );
}

bool intersectSS(Segment s1,Segment s2){
  return intersectSS(s1.p1,s1.p2,s2.p1,s2.p2);
}

bool intersectPS(Polygon p,Segment l){
  Int n=p.size();
  for(Int i=0;i<n;i++)
    if(intersectSS(Segment(p[i],p[(i+1)%n]),l)) return 1;
  return 0;
}

Int intersectCC(Circle c1,Circle c2){
  if(c1.r<c2.r) swap(c1,c2);
  double d=abs(c1.c-c2.c);
  double r=c1.r+c2.r;
  if(equals(d,r)) return ICC_CIRCUMSCRIBE;
  if(d>r) return ICC_SEPERATE;
  if(equals(d+c2.r,c1.r)) return ICC_INSCRIBE;
  if(d+c2.r<c1.r) return ICC_CONTAIN;
  return ICC_INTERSECT;
}

bool intersectSC(Segment s,Circle c){
  return getDistanceSP(s,c.c)<=c.r;
}

Int intersectCS(Circle c,Segment s){
  if(norm(project(s,c.c)-c.c)-c.r*c.r>EPS) return 0;
  double d1=abs(c.c-s.p1),d2=abs(c.c-s.p2);
  if(d1<c.r+EPS&&d2<c.r+EPS) return 0;
  if((d1<c.r-EPS&&d2>c.r+EPS)||(d1>c.r+EPS&&d2<c.r-EPS)) return 1;
  Point h=project(s,c.c);
  if(dot(s.p1-h,s.p2-h)<0) return 2;
  return 0;
}

double getDistanceLP(Line l,Point p){
  return abs(cross(l.p2-l.p1,p-l.p1)/abs(l.p2-l.p1));
}

double getDistanceSP(Segment s,Point p){
  if(dot(s.p2-s.p1,p-s.p1) < 0.0 ) return abs(p-s.p1);
  if(dot(s.p1-s.p2,p-s.p2) < 0.0 ) return abs(p-s.p2);
  return getDistanceLP(s,p);
}

double getDistanceSS(Segment s1,Segment s2){
  if(intersectSS(s1,s2)) return 0.0;
  return min(min(getDistanceSP(s1,s2.p1),getDistanceSP(s1,s2.p2)),
	     min(getDistanceSP(s2,s1.p1),getDistanceSP(s2,s1.p2)));
}

Point getCrossPointSS(Segment s1,Segment s2){
  for(Int k=0;k<2;k++){
    if(getDistanceSP(s1,s2.p1)<EPS) return s2.p1; 
    if(getDistanceSP(s1,s2.p2)<EPS) return s2.p2;
    swap(s1,s2);
  }
  Vector base=s2.p2-s2.p1;
  double d1=abs(cross(base,s1.p1-s2.p1));
  double d2=abs(cross(base,s1.p2-s2.p1));
  double t=d1/(d1+d2);
  return s1.p1+(s1.p2-s1.p1)*t;
}

Point getCrossPointLL(Line l1,Line l2){
  double a=cross(l1.p2-l1.p1,l2.p2-l2.p1);
  double b=cross(l1.p2-l1.p1,l1.p2-l2.p1);
  if(abs(a)<EPS&&abs(b)<EPS) return l2.p1;
  return l2.p1+(l2.p2-l2.p1)*(b/a);
}

Polygon getCrossPointCL(Circle c,Line l){
  Polygon ps;
  Point pr=project(l,c.c);
  Vector e=(l.p2-l.p1)/abs(l.p2-l.p1);
  if(equals(getDistanceLP(l,c.c),c.r)){
    ps.emplace_back(pr);
    return ps;
  }
  double base=sqrt(c.r*c.r-norm(pr-c.c));
  ps.emplace_back(pr+e*base);
  ps.emplace_back(pr-e*base);
  return ps;
}

Polygon getCrossPointCS(Circle c,Segment s){
  Line l(s);
  Polygon res=getCrossPointCL(c,l);
  if(intersectCS(c,s)==2) return res;
  if(res.size()>1u){
    if(dot(l.p1-res[0],l.p2-res[0])>0) swap(res[0],res[1]);
    res.pop_back();
  }
  return res;
}


Polygon getCrossPointCC(Circle c1,Circle c2){
  Polygon p(2);
  double d=abs(c1.c-c2.c);
  double a=acos((c1.r*c1.r+d*d-c2.r*c2.r)/(2*c1.r*d));
  double t=arg(c2.c-c1.c);
  p[0]=c1.c+polar(c1.r,t+a);
  p[1]=c1.c+polar(c1.r,t-a);
  return p;
}

// IN:2 ON:1 OUT:0
Int contains(Polygon g,Point p){
  Int n=g.size();
  bool x=false;
  for(Int i=0;i<n;i++){
    Point a=g[i]-p,b=g[(i+1)%n]-p;
    if(fabs(cross(a,b)) < EPS && dot(a,b) < EPS) return 1;
    if(a.y>b.y) swap(a,b);
    if(a.y < EPS && EPS < b.y && cross(a,b) > EPS ) x = !x;
  }
  return (x?2:0);
}

Polygon andrewScan(Polygon s){
  Polygon u,l;
  if(s.size()<3) return s;
  sort(s.begin(),s.end());
  u.push_back(s[0]);
  u.push_back(s[1]);
  l.push_back(s[s.size()-1]);
  l.push_back(s[s.size()-2]);
  for(Int i=2;i<(Int)s.size();i++){
    for(Int n=u.size();n>=2&&ccw(u[n-2],u[n-1],s[i])!=CCW_CLOCKWISE;n--){
      u.pop_back();
    }
    u.push_back(s[i]);
  } 
  for(Int i=s.size()-3;i>=0;i--){
    for(Int n=l.size();n>=2&&ccw(l[n-2],l[n-1],s[i])!=CCW_CLOCKWISE;n--){
      l.pop_back();
    }
    l.push_back(s[i]);
  }
  reverse(l.begin(),l.end());
  for(Int i=u.size()-2;i>=1;i--) l.push_back(u[i]);
  return l;
} 

Polygon convex_hull(Polygon ps){
  Int n=ps.size();
  sort(ps.begin(),ps.end(),sort_y);
  Int k=0;
  Polygon qs(n*2);
  for(Int i=0;i<n;i++){
    while(k>1&&cross(qs[k-1]-qs[k-2],ps[i]-qs[k-1])<0) k--;
    qs[k++]=ps[i];
  }
  for(Int i=n-2,t=k;i>=0;i--){
    while(k>t&&cross(qs[k-1]-qs[k-2],ps[i]-qs[k-1])<0) k--;
    qs[k++]=ps[i];
  }
  qs.resize(k-1);
  return qs;
}

double diameter(Polygon s){
  Polygon p=s;
  Int n=p.size();
  if(n==2) return abs(p[0]-p[1]);
  Int i=0,j=0;
  for(Int k=0;k<n;k++){
    if(p[i]<p[k]) i=k;
    if(!(p[j]<p[k])) j=k;
  }
  double res=0;
  Int si=i,sj=j;
  while(i!=sj||j!=si){
    res=max(res,abs(p[i]-p[j]));
    if(cross(p[(i+1)%n]-p[i],p[(j+1)%n]-p[j])<0.0){
      i=(i+1)%n;
    }else{
      j=(j+1)%n;
    }
  }
  return res;
}

bool isConvex(Polygon p){
  bool f=1;
  Int n=p.size();
  for(Int i=0;i<n;i++){
    Int t=ccw(p[(i+n-1)%n],p[i],p[(i+1)%n]);
    f&=t!=CCW_CLOCKWISE;
  }
  return f;
}

double area(Polygon s){
  double res=0;
  for(Int i=0;i<(Int)s.size();i++){
    res+=cross(s[i],s[(i+1)%s.size()])/2.0;
  }
  return abs(res);
}

double area(Circle c1,Circle c2){
  double d=abs(c1.c-c2.c);
  if(c1.r+c2.r<=d+EPS) return 0;
  if(d<=abs(c1.r-c2.r)){
    double r=min(c1.r,c2.r);
    return PI*r*r;
  }
  double rc=(d*d+c1.r*c1.r-c2.r*c2.r)/(2*d);
  double th=acos(rc/c1.r);
  double ph=acos((d-rc)/c2.r);
  return c1.r*c1.r*th+c2.r*c2.r*ph-d*c1.r*sin(th);
}

Polygon convexCut(Polygon p,Line l){
  Polygon q;
  for(Int i=0;i<(Int)p.size();i++){
    Point a=p[i],b=p[(i+1)%p.size()];
    if(ccw(l.p1,l.p2,a)!=-1) q.push_back(a);
    if(ccw(l.p1,l.p2,a)*ccw(l.p1,l.p2,b)<0)
      q.push_back(getCrossPointLL(Line(a,b),l));
  }
  return q;
}

Line bisector(Point p1,Point p2){
  Circle c1=Circle(p1,abs(p1-p2)),c2=Circle(p2,abs(p1-p2));
  Polygon p=getCrossPointCC(c1,c2);
  if(cross(p2-p1,p[0]-p1)>0) swap(p[0],p[1]);
  return Line(p[0],p[1]);
}

Vector translate(Vector v,double theta){
  Vector res;
  res.x=cos(theta)*v.x-sin(theta)*v.y;
  res.y=sin(theta)*v.x+cos(theta)*v.y;
  return res;
}

vector<Line> corner(Line l1,Line l2){
  vector<Line> res;
  if(isParallel(l1,l2)){
    double d=getDistanceLP(l1,l2.p1)/2.0;
    Vector v1=l1.p2-l1.p1;
    v1=v1/v1.abs()*d;
    Point p=l2.p1+translate(v1,90.0*(PI/180.0));
    double d1=getDistanceLP(l1,p);
    double d2=getDistanceLP(l2,p);
    if(abs(d1-d2)>d){
      p=l2.p1+translate(v1,-90.0*(PI/180.0));
    }
    res.push_back(Line(p,p+v1));
  }else{
    Point p=getCrossPointLL(l1,l2);
    Vector v1=l1.p2-l1.p1,v2=l2.p2-l2.p1;
    v1=v1/v1.abs();
    v2=v2/v2.abs();
    res.push_back(Line(p,p+(v1+v2)));
    res.push_back(Line(p,p+translate(v1+v2,90.0*(PI/180.0))));
  }
  return res;
}

Polygon tangent(Circle c1,Point p2){
  Circle c2=Circle(p2,sqrt(norm(c1.c-p2)-c1.r*c1.r));
  Polygon p=getCrossPointCC(c1,c2);
  sort(p.begin(),p.end());
  return p;
}

vector<Line> tangent(Circle c1,Circle c2){
  vector<Line> ls;
  if(c1.r<c2.r) swap(c1,c2);
  double g=norm(c1.c-c2.c);
  if(equals(g,0)) return ls;
  Point u=(c2.c-c1.c)/sqrt(g);
  Point v=orth(u);
  for(Int s=1;s>=-1;s-=2){
    double h=(c1.r+s*c2.r)/sqrt(g);
    if(equals(1-h*h,0)){
      ls.emplace_back(c1.c+u*c1.r,c1.c+(u+v)*c1.r);
    }else if(1-h*h>0){
      Point uu=u*h,vv=v*sqrt(1-h*h);
      ls.emplace_back(c1.c+(uu+vv)*c1.r,c2.c-(uu+vv)*c2.r*s);
      ls.emplace_back(c1.c+(uu-vv)*c1.r,c2.c-(uu-vv)*c2.r*s);
    }
  }
  
  return ls;
}

double closest_pair(Polygon &a,Int l=0,Int r=-1){
  if(r<0){
    r=a.size();
    sort(a.begin(),a.end(),sort_x);
  }
  if(r-l<=1) return abs(a[0]-a[1]);
  Int m=(l+r)>>1;
  double x=a[m].x;
  double d=min(closest_pair(a,l,m),closest_pair(a,m,r));
  inplace_merge(a.begin()+l,a.begin()+m,a.begin()+r,sort_y);

  Polygon b;
  for(Int i=l;i<r;i++){
    if(fabs(a[i].x-x)>=d) continue;
    for(Int j=0;j<(Int)b.size();j++){
      double dy=a[i].y-next(b.rbegin(),j)->y;
      if(dy>=d) break;
      d=min(d,abs(a[i]-*next(b.rbegin(),j)));
    }
    b.emplace_back(a[i]);
  }
  return d;
}

vector<vector<pair<Int, double> > >
segmentArrangement(vector<Segment> &ss, Polygon &ps){
  Int n=ss.size();
  for(Int i=0;i<n;i++){
    ps.emplace_back(ss[i].p1);
    ps.emplace_back(ss[i].p2);
    for(Int j=i+1;j<n;j++)
      if(intersectSS(ss[i],ss[j]))
	ps.emplace_back(getCrossPointSS(ss[i],ss[j]));
  }
  sort(ps.begin(),ps.end());
  ps.erase(unique(ps.begin(),ps.end()),ps.end());

  vector<vector<pair<Int, double> > > G(ps.size());
  for(Int i=0;i<n;i++){
    vector<pair<double,Int> > ls;
    for(Int j=0;j<(Int)ps.size();j++)
      if(getDistanceSP(ss[i],ps[j])<EPS)
	ls.emplace_back(make_pair(norm(ss[i].p1-ps[j]),j));
      
    sort(ls.begin(),ls.end());
    for(Int j=0;j+1<(Int)ls.size();j++){
      Int a=ls[j].second,b=ls[j+1].second;
      G[a].emplace_back(b,abs(ps[a]-ps[b]));
      G[b].emplace_back(a,abs(ps[a]-ps[b]));
    }
  }
  return G;
}

Int manhattanIntersection(vector<Segment> ss,const Int INF){
  const Int BTM = 0;
  const Int LFT = 1;
  const Int RGH = 2;
  const Int TOP = 3;
  
  Int n=ss.size();
  vector<EndPoint> ep;
  for(Int i=0;i<n;i++){
    if(ss[i].p1.y==ss[i].p2.y){
      if(ss[i].p1.x>ss[i].p2.x) swap(ss[i].p1,ss[i].p2);
      ep.emplace_back(ss[i].p1,i,LFT);
      ep.emplace_back(ss[i].p2,i,RGH);
    }else{
      if(ss[i].p1.y>ss[i].p2.y) swap(ss[i].p1,ss[i].p2);      
      ep.emplace_back(ss[i].p1,i,BTM);
      ep.emplace_back(ss[i].p2,i,TOP);
    }    
  }   
  sort(ep.begin(),ep.end());

  set<Int> bt;
  bt.insert(INF);
  
  Int cnt=0;
  for(Int i=0;i<n*2;i++){
    if(ep[i].st==TOP){
      bt.erase(ep[i].p.x);
    }else if(ep[i].st==BTM){
      bt.emplace(ep[i].p.x);
    }else if(ep[i].st==LFT){
      auto b=bt.lower_bound(ss[ep[i].seg].p1.x);
      auto e=bt.upper_bound(ss[ep[i].seg].p2.x);
      cnt+=distance(b,e);
    }    
  }
  
  return cnt;
}

double area(Polygon ps,Circle c){
  if(ps.size()<3u) return 0;
  function<double(Circle, Point, Point)> dfs=
    [&](Circle c,Point a,Point b){
      Vector va=c.c-a,vb=c.c-b;
      double f=cross(va,vb),res=0;
      if(equals(f,0.0)) return res;
      if(max(abs(va),abs(vb))<c.r+EPS) return f;
      Vector d(a.x*b.x+a.y*b.y,a.x*b.y-a.y*b.x);
      if(getDistanceSP(Segment(a,b),c.c)>c.r-EPS)
	return c.r*c.r*atan2(d.y,d.x);
      auto u=getCrossPointCS(c,Segment(a,b));
      if(u.empty()) return res;
      if(u.size()>1u&&dot(u[1]-u[0],a-u[0])>0) swap(u[0],u[1]);
      u.emplace(u.begin(),a);
      u.emplace_back(b);
      for(Int i=1;i<(Int)u.size();i++)
	res+=dfs(c,u[i-1],u[i]);
      return res;
    };
  double res=0;
  for(Int i=0;i<(Int)ps.size();i++)
    res+=dfs(c,ps[i],ps[(i+1)%ps.size()]);
  return res/2;
}


//INSERT ABOVE HERE


Int is_tri(double a,double b,double c){
  if(a+b<c) return 0;
  if(a+c<b) return 0;
  if(b+c<a) return 0;
  return 1;
}
const Int step = 50;
Int n;
double a,b;
Circle ca,cb;
Int check(double x,Circle d,Int s,Int f=0){
  //cout<<x<<":"<<s<<" "<<n<<endl;
  if(s>=n) return 0;  
  double p=a+x;
  double q=b-x;
  double r=b-a;
  if(!is_tri(p,q,r)) return 0;
  double th=acos((q*q+r*r-p*p)/(2*q*r));
  Vector v(-q,0);
  v=translate(v,-th);
  Circle c(v+cb.c,x);
  if(abs(c.c-d.c)<c.r+d.r) return 0;
  //cout<<c.c<<endl;
  if(f) return 1;
  
  Circle e=c;
  e.c.y*=-1;
  if(abs(c.c-e.c)<c.r+e.r) return 1;
  
  double L=x,R=b-a;
  if(!check(R,c,s+2,1)) return 2;
  for(Int k=0;k<step;k++){
    double M=(L+R)/2;
    if(check(M,c,s+2,1)) R=M;
    else L=M;
  }
  return check(R,c,s+2)+2;
}

signed main(){
  cin>>n>>a>>b;
  ca=Circle(Point(a,0),a);
  cb=Circle(Point(b,0),b);
  
  double l=0,r=b-a;
  for(Int k=0;k<step;k++){
    double m=(l+r)/2;
    if(check(m,Circle(Point(0,0),0),0)>=n) l=m;
    else r=m;
  }
  
  cout<<l<<endl;
  return 0;
}
yukicoder

結果

テストケース

ソースコード
