Submission #1000807
Source Code Expand
// {{{ by shik
#include <bits/stdc++.h>
#include <unistd.h>
#define SZ(x) ((int)(x).size())
#define ALL(x) begin(x),end(x)
#define REP(i,n) for ( int i=0; i<int(n); i++ )
#define REP1(i,a,b) for ( int i=(a); i<=int(b); i++ )
#define FOR(it,c) for ( auto it=(c).begin(); it!=(c).end(); it++ )
#define MP make_pair
#define PB push_back
using namespace std;
typedef long long LL;
typedef pair<int,int> PII;
typedef vector<int> VI;
#ifdef SHIK
template<typename T>
void _dump( const char* s, T&& head ) { cerr<<s<<"="<<head<<endl; }
template<typename T, typename... Args>
void _dump( const char* s, T&& head, Args&&... tail ) {
int c=0;
while ( *s!=',' || c!=0 ) {
if ( *s=='(' || *s=='[' || *s=='{' ) c++;
if ( *s==')' || *s==']' || *s=='}' ) c--;
cerr<<*s++;
}
cerr<<"="<<head<<", ";
_dump(s+1,tail...);
}
#define dump(...) do { \
fprintf(stderr, "%s:%d - ", __PRETTY_FUNCTION__, __LINE__); \
_dump(#__VA_ARGS__, __VA_ARGS__); \
} while (0)
template<typename Iter>
ostream& _out( ostream &s, Iter b, Iter e ) {
s<<"[";
for ( auto it=b; it!=e; it++ ) s<<(it==b?"":" ")<<*it;
s<<"]";
return s;
}
template<typename A, typename B>
ostream& operator <<( ostream &s, const pair<A,B> &p ) { return s<<"("<<p.first<<","<<p.second<<")"; }
template<typename T>
ostream& operator <<( ostream &s, const vector<T> &c ) { return _out(s,ALL(c)); }
template<typename T, size_t N>
ostream& operator <<( ostream &s, const array<T,N> &c ) { return _out(s,ALL(c)); }
template<typename T>
ostream& operator <<( ostream &s, const set<T> &c ) { return _out(s,ALL(c)); }
template<typename A, typename B>
ostream& operator <<( ostream &s, const map<A,B> &c ) { return _out(s,ALL(c)); }
#else
#define dump(...)
#endif
template<typename T>
void _R( T &x ) { cin>>x; }
void _R( int &x ) { scanf("%d",&x); }
void _R( long long &x ) { scanf("%" PRId64,&x); }
void _R( double &x ) { scanf("%lf",&x); }
void _R( char &x ) { scanf(" %c",&x); }
void _R( char *x ) { scanf("%s",x); }
void R() {}
template<typename T, typename... U>
void R( T& head, U&... tail ) {
_R(head);
R(tail...);
}
template<typename T>
void _W( const T &x ) { cout<<x; }
void _W( const int &x ) { printf("%d",x); }
template<typename T>
void _W( const vector<T> &x ) {
for ( auto i=x.cbegin(); i!=x.cend(); i++ ) {
if ( i!=x.cbegin() ) putchar(' ');
_W(*i);
}
}
void W() {}
template<typename T, typename... U>
void W( const T& head, const U&... tail ) {
_W(head);
putchar(sizeof...(tail)?' ':'\n');
W(tail...);
}
#ifdef SHIK
#define FILEIO(...)
#else
#define FILEIO(name) do {\
freopen(name ".in","r",stdin); \
freopen(name ".out","w",stdout); \
} while (0)
#endif
// }}}
const double eps=1e-9;
int sgn( double x ) {
return (x>eps)-(x<-eps);
}
struct P {
double x,y;
P(){}
P( double _x, double _y ):x(_x),y(_y){}
double len() { return sqrt(x*x+y*y); }
double ang() { return atan2(y,x); }
P rot() {
return P{y,-x};
}
P norm() {
double l=len();
P p=*this;
p.x/=l;
p.y/=l;
return p;
}
};
P operator +( P a, P b ) { return P(a.x+b.x,a.y+b.y); }
P operator -( P a, P b ) { return P(a.x-b.x,a.y-b.y); }
P operator *( double a, P b ) { return P(a*b.x,a*b.y); }
P operator /( P a, double b ) { return P(a.x/b,a.y/b); }
double operator ^( P a, P b ) { return a.x*b.y-b.x*a.y; }
double X( P o, P a, P b ) { return (a-o)^(b-o); }
int dir( P o, P a, P b ) { return sgn(X(o,a,b)); }
double dis( P a, P b ) { return (a-b).len(); }
struct Ln {
P p1,p2;
double ang;
Ln(){}
Ln( P _p1, P _p2 ):p1(_p1),p2(_p2),ang((p2-p1).ang()){}
P norm() {
P v=p2-p1;
v=v.rot();
v=v.norm();
return v;
}
};
Ln operator+( const Ln &a, const P &b ) { return Ln{a.p1+b,a.p2+b}; }
P jiao( Ln a, Ln b ) {
double u=X(a.p1,a.p2,b.p1);
double v=X(a.p2,a.p1,b.p2);
return (v*b.p1+u*b.p2)/(u+v);
}
double incenter(P a, P b, P c){
double A = dis(b,c), B = dis(c,a), C = dis(a,b);
double r = fabs(X(a,b,c))/(A+B+C);
return r;
}
P a,b,c;
bool chk( double r ) {
Ln ab{a,b};
Ln bc{b,c};
Ln ca{c,a};
ab=ab+r*ab.norm();
bc=bc+r*bc.norm();
ca=ca+r*ca.norm();
P pa=jiao(ca,ab);
P pb=jiao(ab,bc);
P pc=jiao(bc,ca);
dump(pa.x,pa.y,pb.x,pb.y,pc.x,pc.y);
double dab=dis(pa,pb);
double dbc=dis(pb,pc);
double dca=dis(pc,pa);
r*=2;
return dab>=r || dbc>=r || dca>=r;
}
int main() {
R(a.x,a.y,b.x,b.y,c.x,c.y);
if ( dir(a,b,c)==+1 ) {
swap(a,c);
}
double l=0,r=incenter(a,b,c);
REP(i,100) {
double m=(l+r)/2;
if ( chk(m) ) l=m;
else r=m;
}
double ans=(l+r)/2;
printf("%.14f\n",ans);
return 0;
}
Submission Info
Submission Time
2016-11-28 13:06:42+0900
Task
B - Inscribed Bicycle
User
shik
Language
C++14 (GCC 5.4.1)
Score
500
Code Size
4957 Byte
Status
AC
Exec Time
3 ms
Memory
256 KB
Compile Error
./Main.cpp: In function ‘void _R(long long int&)’:
./Main.cpp:62:46: warning: format ‘%ld’ expects argument of type ‘long int*’, but argument 2 has type ‘long long int*’ [-Wformat=]
void _R( long long &x ) { scanf("%" PRId64,&x); }
^
./Main.cpp: In function ‘void _R(int&)’:
./Main.cpp:61:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
void _R( int &x ) { scanf("%d",&x); }
^
./Main.cpp: In function ‘void _R(long long int&)’:
./Main.cpp:62:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
void _R( long long &x ) { scanf("%" PRId64,&x); }
^
./Main.cpp: In function ‘void _R(double&)’:
./Main.cpp:63:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-resu...
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
3 ms
256 KB
001.txt
AC
3 ms
256 KB
002.txt
AC
3 ms
256 KB
003.txt
AC
3 ms
256 KB
004.txt
AC
3 ms
256 KB
005.txt
AC
3 ms
256 KB
006.txt
AC
3 ms
256 KB
007.txt
AC
3 ms
256 KB
008.txt
AC
3 ms
256 KB
009.txt
AC
3 ms
256 KB
010.txt
AC
3 ms
256 KB
011.txt
AC
3 ms
256 KB
012.txt
AC
3 ms
256 KB
013.txt
AC
3 ms
256 KB
014.txt
AC
3 ms
256 KB
015.txt
AC
3 ms
256 KB
example0.txt
AC
3 ms
256 KB
example1.txt
AC
3 ms
256 KB