Compilare: user.cpp: In function ‘void DFS_Timpifinali(int)’: user.cpp:57:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<L[x].size();i++) ^ user.cpp: In function ‘void DFS_tr(int, int)’: user.cpp:70:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<L_tr[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:105:11: warning: unused variable ‘j’ [-Wunused-variable] int x,j,i; ^