Compilare: main.cpp: In member function 'void graf::sortvecini()': main.cpp:96:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<unsigned int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 96 | for (int i=1; i<this->lista_vecini.size(); ++i) | ~^~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:99:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<unsigned int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 99 | for (j=0; j<lista_vecini[i].size(); ++j) | ~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'void graf::biconex(unsigned int)': main.cpp:179:20: warning: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Wsign-compare] 179 | for (i=1; i<=n; ++i) | ~^~~ main.cpp:209:26: warning: unused variable 'first' [-Wunused-variable] 209 | bool first=true; | ^~~~~