Compilare: user.cpp: In function ‘bool inuti(PTX, std::vector<PTX>)’: user.cpp:38:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < hull.size(); ++i) ^ user.cpp: In function ‘std::vector<PTX> make_hull(int, int)’: user.cpp:59:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < tmp.size(); ++i) { ^ user.cpp:76:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<hull.size(); ++i) ^ user.cpp: In function ‘bool disjoint(const std::vector<PTX>&, const std::vector<PTX>&)’: user.cpp:83:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<a.size(); ++i) ^ user.cpp:86:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<b.size(); ++i) ^ user.cpp: In function ‘int bfs(int)’: user.cpp:141:1: warning: control reaches end of non-void function [-Wreturn-type] } ^