摘要：
http://poj.org/problem?id=1113 1 #include 2 #include 3 #include 4 #include 5 #include 6 using namespace std; 7 8 const int maxn=5000; 9 const double pi=acos(-1.0);10 11 struct point12 {13 double x,y;14 bool operator 1&&det(ch[m-2],ch[m-1],p[i])=0; i--)46 {47 while(m>k&&det(ch[m-.. 阅读全文
