Compilare: user.cpp: In function ‘void APM(int)’: user.cpp:81:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<M.size();i++) { ^ user.cpp:86:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i < M.size(); i++) { ^ user.cpp:98:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sol.size(); i++) ^