Compilare: user.cpp: In function ‘void dfsgraph(int)’: user.cpp:19:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<gr[node].size();i++) ^ user.cpp: In function ‘void dfstrans(int)’: user.cpp:30:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<tr[node].size();i++) ^ user.cpp: In function ‘void kosaraju()’: user.cpp:37:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x; ^