Compilare: user.cpp: In function ‘int pairup(int)’: user.cpp:23:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();++i) if(!r[v[x][i]]) ^ user.cpp:30:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();++i) if(pairup(r[v[x][i]])) ^ user.cpp: In function ‘void check(int)’: user.cpp:42:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();++i) if(!solr[v[x][i]]) // pentru fiecare nod vecin care nu e in solutie ^