Compilare: user.cpp: In function ‘double getArea(const std::vector<Point>&)’: user.cpp:32:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < P.size(); i++) Ar += fabs(Det(P[0], P[i - 1], P[i])); ^ user.cpp: In function ‘double getPer(const std::vector<Point>&)’: user.cpp:38:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < P.size() - 2; i++) Per += Dist(P[i], P[i + 1]); ^ user.cpp: In function ‘std::vector<Point> Reorder(const std::vector<Point>&)’: user.cpp:50:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = Pos; i < P.size(); i++) pNew[i - Pos] = P[i]; ^ user.cpp: In function ‘void Solve(std::vector<Point>&)’: user.cpp:100:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i++; i < P.size(); i++) Up.push_back(P[i]); ^