Compilare: user.cpp: In function ‘void de_spiralise(std::vector<cerc>&, std::vector<std::vector<cerc> >&)’: user.cpp:26:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < cs.size(); ){ ^ user.cpp:28:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(const int tmp = i; i < cs.size() && same_p(cs[tmp], cs[i]); ++i){ ^ user.cpp: In function ‘void mk_spectacole(const std::vector<cerc>&, std::vector<interval>&)’: user.cpp:39:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < cs.size(); ++i){ ^ user.cpp: In function ‘int do_spectacole(std::vector<interval>&)’: user.cpp:47:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < spects.size(); ++i){ ^ user.cpp: In function ‘int main()’: user.cpp:72:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < lines.size(); ++i){ ^ user.cpp:77:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < lines_intervals.size(); ++i){ ^