Compilare: user.cpp: In function ‘int main()’: user.cpp:73:33: warning: variable ‘lb’ set but not used [-Wunused-but-set-variable] int lr = 0, lg = 0, lb = 0; ^ user.cpp:145:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vr.size(); i++) ^ user.cpp:148:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vg.size(); i++) ^ user.cpp:151:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vb.size(); i++) ^