Compilare: user.cpp: In function ‘int main()’: user.cpp:110:10: warning: unused variable ‘cin_buff’ [-Wunused-variable] auto cin_buff = cin.rdbuf(); ^~~~~~~~ user.cpp:111:10: warning: unused variable ‘cout_buff’ [-Wunused-variable] auto cout_buff = cout.rdbuf(); ^~~~~~~~~ user.cpp: In function ‘void solve()’: user.cpp:74:17: warning: ‘root’ may be used uninitialized in this function [-Wmaybe-uninitialized] BFS(root, d); ^