Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:10:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<tr[node].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:20:9: warning: unused variable ‘root’ [-Wunused-variable] int root=1; ^ user.cpp:27:9: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int ok=0; ^