Compilare: user.cpp: In function ‘bool conex()’: user.cpp:36:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v[k].size() ; ++i) ^ user.cpp: In function ‘void sterge(int, int)’: user.cpp:61:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v[x].size() ; ++i) ^ user.cpp: In function ‘void afis()’: user.cpp:92:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < sol.size() ; ++i) ^