Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:23:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<mat[nod].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:58:5: warning: unused variable ‘a1’ [-Wunused-variable] int a1=0; ^ user.cpp:48:13: warning: unused variable ‘l’ [-Wunused-variable] int t,m,l; ^