Compilare: user.cpp: In function ‘int cupleaza(int)’: user.cpp:30:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < vec[x].size(); i++ ) //cauta un nod din stanga adiacent cu x care nu este cuplat ^ user.cpp:36:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < vec[x].size(); i++ ) // daca nu se reuseste pasul anterior, se cupleaza x cu nod y deja ales ^