0_0_15577569_21015.cpp: In function 'int dcmp(double)':
0_0_15577569_21015.cpp:3:14: error: 'fabs' was not declared in this scope
if(fabs(x)<eps) return 0;else return x < 0 ? -1 : 1;
^
0_0_15577569_21015.cpp: In function 'double dis(Point, Point)':
0_0_15577569_21015.cpp:23:57: error: 'sqrt' was not declared in this scope
return sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));
^
0_0_15577569_21015.cpp: In function 'double Length(Vec)':
0_0_15577569_21015.cpp:38:45: error: 'sqrt' was not declared in this scope
double Length(Vec A) { return sqrt(Dot(A,A)); }
^
0_0_15577569_21015.cpp: In function 'double Angle(Vec, Vec)':
0_0_15577569_21015.cpp:40:70: error: 'acos' was not declared in this scope
double Angle(Vec A,Vec B) { return acos(Dot(A,B)/Length(A)/Length(B)); }
^
0_0_15577569_21015.cpp: In function 'Vec Rotate(Vec, double)':
0_0_15577569_21015.cpp:47:27: error: 'cos' was not declared in this scope
return Vec(A.x*cos(rad)-A.y*sin(rad),A.x*sin(rad)+A.y*cos(rad));
^
0_0_15577569_21015.cpp:47:40: error: 'sin' was not declared in this scope
return Vec(A.x*cos(rad)-A.y*sin(rad),A.x*sin(rad)+A.y*cos(rad));
^
0_0_15577569_21015.cpp: In function 'double Dis_to_Line(Point, Point, Point)':
0_0_15577569_21015.cpp:76:29: error: 'fabs' was not declared in this scope
return fabs(Cross(v1,v2)) / Length(v1);
^
0_0_15577569_21015.cpp: In function 'double Dis_to_Seg(Point, Point, Point)':
0_0_15577569_21015.cpp:84:34: error: 'fabs' was not declared in this scope
else return fabs(Cross(v1,v2))/Length(v1);
^
0_0_15577569_21015.cpp: In function 'int convechull(int)':
0_0_15577569_21015.cpp:111:15: error: 'sort' was not declared in this scope
sort(p,p+n);
^
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