Submission #1939273
Source Code Expand
#include<stdio.h>
#include<math.h>
#include<algorithm>
#include<queue>
#include<deque>
#include<string>
#include<string.h>
#include<vector>
#include<set>
#include<map>
#include<bitset>
#include<stdlib.h>
#include<cassert>
using namespace std;
const long long mod=1000000007;
const long long inf=mod*mod;
const long long d2=500000004;
const double EPS=1e-6;
const double PI=acos(-1.0);
int ABS(int a){return max(a,-a);}
long long ABS(long long a){return max(a,-a);}
//const double EPS = 1e-10;
const double INF = 1e+10;
//const double PI = acos(-1);
int sig(double r) { return (r < -EPS) ? -1 : (r > +EPS) ? +1 : 0; }
inline double ABS(double a){return max(a,-a);}
struct Pt {
double x, y;
Pt() {}
Pt(double x, double y) : x(x), y(y) {}
Pt operator+(const Pt &a) const { return Pt(x + a.x, y + a.y); }
Pt operator-(const Pt &a) const { return Pt(x - a.x, y - a.y); }
Pt operator*(const Pt &a) const { return Pt(x * a.x - y * a.y, x * a.y + y * a.x); }
Pt operator-() const { return Pt(-x, -y); }
Pt operator*(const double &k) const { return Pt(x * k, y * k); }
Pt operator/(const double &k) const { return Pt(x / k, y / k); }
double ABS() const { return sqrt(x * x + y * y); }
double abs2() const { return x * x + y * y; }
double arg() const { return atan2(y, x); }
double dot(const Pt &a) const { return x * a.x + y * a.y; }
double det(const Pt &a) const { return x * a.y - y * a.x; }
};
double tri(const Pt &a, const Pt &b, const Pt &c) { return (b - a).det(c - a); }
int iSP(Pt a, Pt b, Pt c) {
int s = sig((b - a).det(c - a));
if (s) return s;
if (sig((b - a).dot(c - a)) < 0) return -2; // c-a-b
if (sig((a - b).dot(c - b)) < 0) return +2; // a-b-c
return 0;
}
int iLL(Pt a, Pt b, Pt c, Pt d) {
if (sig((b - a).det(d - c))) return 1; // intersect
if (sig((b - a).det(c - a))) return 0; // parallel
return -1; // correspond
}
bool iLS(Pt a, Pt b, Pt c, Pt d) {
return (sig(tri(a, b, c)) * sig(tri(a, b, d)) <= 0);
}
bool iSS(Pt a, Pt b, Pt c, Pt d) {
return (iSP(a, b, c) * iSP(a, b, d) <= 0 && iSP(c, d, a) * iSP(c, d, b) <= 0);
}
bool iSSstrict(Pt a, Pt b, Pt c, Pt d) {
return (sig(tri(a, b, c)) * sig(tri(a, b, d)) < 0 && sig(tri(c, d, a)) * sig(tri(c, d, b)) < 0);
}
Pt pLL(Pt a, Pt b, Pt c, Pt d) {
b = b - a; d = d - c; return a + b * (c - a).det(d) / b.det(d);
}
Pt hLP(Pt a,Pt b,Pt c){
return pLL(a,b,c,c+(b-a)*Pt(0,1));
}
double dLP(Pt a, Pt b, Pt c) {
return ABS(tri(a, b, c)) / (b - a).ABS();
}
double dSP(Pt a, Pt b, Pt c) {
if (sig((b - a).dot(c - a)) <= 0) return (c - a).ABS();
if (sig((a - b).dot(c - b)) <= 0) return (c - b).ABS();
return ABS(tri(a, b, c)) / (b - a).ABS();
}
double dLL(Pt a, Pt b, Pt c, Pt d) {
return iLL(a, b, c, d) ? 0 : dLP(a, b, c);
}
double dLS(Pt a, Pt b, Pt c, Pt d) {
return iLS(a, b, c, d) ? 0 : min(dLP(a, b, c), dLP(a, b, d));
}
double dSS(Pt a, Pt b, Pt c, Pt d) {
return iSS(a, b, c, d) ? 0 : min(min(dSP(a, b, c), dSP(a, b, d)), min(dSP(c, d, a), dSP(c, d, b)));
}
int sGP(int n, Pt p[], Pt a) {
int side = -1, i;
p[n] = p[0];
for (i = 0; i < n; ++i) {
Pt p0 = p[i] - a, p1 = p[i + 1] - a;
if (sig(p0.det(p1)) == 0 && sig(p0.dot(p1)) <= 0) return 0;
if (p0.y > p1.y) swap(p0, p1);
if (sig(p0.y) <= 0 && 0 < sig(p1.y) && sig(p0.det(p1)) > 0) side = -side;
}
return side;
}
Pt p[4];
Pt q[10];
int main(){
for(int i=0;i<3;i++){
double X,Y;
scanf("%lf%lf",&X,&Y);
p[i]=Pt(X,Y);
}
p[3]=p[0];
if(iSP(p[0],p[1],p[2])<0)swap(p[1],p[2]);
double left=0;
double right=11000;
for(int i=0;i<100;i++){
double M=(left+right)/2;
Pt v1=(p[1]-p[0])*Pt(0,1);
v1=v1/v1.ABS()*M;
pair<Pt,Pt> l1=make_pair(p[0]+v1,p[1]+v1);
Pt v2=(p[2]-p[1])*Pt(0,1);
v2=v2/v2.ABS()*M;
pair<Pt,Pt> l2=make_pair(p[1]+v2,p[2]+v2);
Pt v3=(p[0]-p[2])*Pt(0,1);
v3=v3/v3.ABS()*M;
pair<Pt,Pt> l3=make_pair(p[2]+v3,p[0]+v3);
q[0]=pLL(l1.first,l1.second,l2.first,l2.second);
q[1]=pLL(l2.first,l2.second,l3.first,l3.second);
q[2]=pLL(l3.first,l3.second,l1.first,l1.second);
bool ok=true;
if(sGP(3,p,q[0])==-1)ok=false;
if(sGP(3,p,q[1])==-1)ok=false;
if(sGP(3,p,q[2])==-1)ok=false;
if(dLP(p[0],p[1],q[0])<M-EPS)ok=false;
if(dLP(p[0],p[1],q[1])<M-EPS)ok=false;
if(dLP(p[0],p[1],q[2])<M-EPS)ok=false;
if(dLP(p[2],p[1],q[0])<M-EPS)ok=false;
if(dLP(p[2],p[1],q[1])<M-EPS)ok=false;
if(dLP(p[2],p[1],q[2])<M-EPS)ok=false;
if(dLP(p[0],p[2],q[0])<M-EPS)ok=false;
if(dLP(p[0],p[2],q[1])<M-EPS)ok=false;
if(dLP(p[0],p[2],q[2])<M-EPS)ok=false;
if(max(max((q[0]-q[1]).ABS(),(q[2]-q[1]).ABS()),(q[0]-q[2]).ABS())<M*2)ok=false;
if(ok)left=M;
else right=M;
}
printf("%.12f\n",left);
}
Submission Info
Submission Time
2018-01-04 14:24:23+0900
Task
B - Inscribed Bicycle
User
tozangezan
Language
C++14 (GCC 5.4.1)
Score
500
Code Size
4742 Byte
Status
AC
Exec Time
1 ms
Memory
128 KB
Compile Error
./Main.cpp: In function ‘int main()’:
./Main.cpp:106:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%lf%lf",&X,&Y);
^
Judge Result
Set Name
Sample
All
Score / Max Score
0 / 0
500 / 500
Status
Set Name
Test Cases
Sample
example0.txt, example1.txt
All
000.txt, 001.txt, 002.txt, 003.txt, 004.txt, 005.txt, 006.txt, 007.txt, 008.txt, 009.txt, 010.txt, 011.txt, 012.txt, 013.txt, 014.txt, 015.txt, example0.txt, example1.txt
Case Name
Status
Exec Time
Memory
000.txt
AC
1 ms
128 KB
001.txt
AC
1 ms
128 KB
002.txt
AC
1 ms
128 KB
003.txt
AC
1 ms
128 KB
004.txt
AC
1 ms
128 KB
005.txt
AC
1 ms
128 KB
006.txt
AC
1 ms
128 KB
007.txt
AC
1 ms
128 KB
008.txt
AC
1 ms
128 KB
009.txt
AC
1 ms
128 KB
010.txt
AC
1 ms
128 KB
011.txt
AC
1 ms
128 KB
012.txt
AC
1 ms
128 KB
013.txt
AC
1 ms
128 KB
014.txt
AC
1 ms
128 KB
015.txt
AC
1 ms
128 KB
example0.txt
AC
1 ms
128 KB
example1.txt
AC
1 ms
128 KB