Compilare: user.cpp: In function ‘void df(int, int)’: user.cpp:74:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<dr[x].size();i++){ ^ user.cpp: In function ‘void dh(int)’: user.cpp:91:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<dr[nod].size();i++){ ^ user.cpp:82:11: warning: unused variable ‘val’ [-Wunused-variable] int nod,val; ^