摘要：#include <bits/stdc++.h> using namespace std; const long double eps=1e-8; const double pi=acos(-1.0); int sgn(double x) { if(fabs(x)<eps) return 0; re 阅读全文

摘要：Two organizations International Community for Preservation of Constructions (ICPC) and Japanese Archaeologist Group (JAG) engage in ruins preservation 阅读全文