Compilare: user.cpp: In function ‘int cerinta2()’: user.cpp:54:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<unu.size();i++) ^ user.cpp:56:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<unu.size();j++) ^ user.cpp:61:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<doi.size();k++) ^