Compilare: user.cpp: In function ‘void afisare2()’: user.cpp:84:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<b.size();i++) ^ user.cpp: In function ‘void ceva()’: user.cpp:115:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<b.size();i++) ^ user.cpp:118:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<b.size();j++) ^ user.cpp:135:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<b.size();i++) ^