Compilare: user.cpp: In function ‘void DfsDown(int)’: user.cpp:262:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( pos >= D_down[nod].size() ) ^ user.cpp:258:13: warning: unused variable ‘lc’ [-Wunused-variable] int lc = D_down[nod].size() - 1; ^ user.cpp:260:13: warning: unused variable ‘c’ [-Wunused-variable] int c; ^ user.cpp:280:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( pv - 1 < D_down[nod].size() ) ^ user.cpp:284:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( pv == D_down[nod].size() ) ^ user.cpp:287:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( pv < D_down[nod].size() ) ^