Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:28:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < graf[nod].size(); ++i) DFS(graf[nod][i]); ^ user.cpp:33:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graf[nod].size(); ++i) ^ user.cpp:27:9: warning: unused variable ‘last’ [-Wunused-variable] int last; ^