計算幾何模板 更新中

今天又切了一題，做題的同時當然也驗證了各種模板

每次都感覺有所改進

view code

#include 

#include 
#include
using
namespace std;
const
int maxn = 100010;
const
double eps = 1e-8;
inline int max(int x,int y)
inline double max(double x,double y) 
inline double min(double a,double b)
struct point
point operator - (const point& t) const 
bool
operator
< (const point &p) const 
bool
operator == (const point& t) const 
}p[maxn],set[maxn];
struct seg;
struct line ;
inline double dist(point a,point b)
bool cmp(point a,point b) 
bool chonghe(point a,point b,point c,point d)//
判斷線段共線,即直線與線段共線
bool inter(point a,point b,point c,point d)//
判斷a,b直線是否與c,d線段相交
bool dotonseg(point p, point s, point e) 
line turn(point s, point e) 
bool intersect(point p1, point p2, point p3, point p4, point& p) 
bool point_in_polygon(point o, point* p, int n) 
if ( cross(o, a, b) < -eps && a.y < o.y-eps && o.y < b.y+eps )
t++;
}return t&1;
}bool seg_inst(seg s1, seg s2, point &p) 
bool check(seg s1, seg s2, point& pp) 
if ( s1.e==s2.s || s1.e==s2.e) 
return
false;
}

view code

inline double

ppdis(point a,point b)
inline 
double
pldis(point a,point l1,point l2)

view code

inline int _sgn(double x)

int is_convex(int n,point p);
for(i=0;i1]|s[2];i++)
s[_sgn(cross(p[i],p[(i+1)%n],p[(i+2)%n]))]=0
; 
return s[1]|s[2
];}

view code

int inside_convex(point q,int n,point *p);

for(i=0;i1]|s[2];i++)
s[_sgn(cross(p[i],p[(i+1)%n],q))]=0
; 
return s[1]|s[2
];}

view code

#include #include 

#include
using
namespace
std;
const
int maxn = 100010
;const
double eps = 1e-8
;inline 
double sgn(double x) 
struct
point
}p[maxn],
set[maxn];
inline 
double cross(point a,point b,point c)
bool
dotonseg(point p, point s, point e) 
bool point_in_polygon(point o, point* p, int
n) 
if ( cross(o, a, b) < -eps && a.y < o.y-eps && o.y < b.y+eps )
t++;
}return t&1
;}

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