Compilare: user.cpp: In function ‘void dfsup(int, int)’: user.cpp:50:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<q[nod].size(); ++i) ^ user.cpp: In function ‘void dfslow(int, int)’: user.cpp:40:4: warning: ‘nod1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (p->nod!=nod1) max1=max(max1,max(val[p->nod],maxlow[0][p->nod])); ^