Compilare: user.cpp:28:24: warning: integer overflow in expression [-Woverflow] const int oo = (1<<31)-1; ^ user.cpp: In function ‘int Q(int, int, int)’: user.cpp:106:9: warning: unused variable ‘lca’ [-Wunused-variable] int lca = LCA(x, y); ^ user.cpp:108:12: warning: ‘Ans’ is used uninitialized in this function [-Wuninitialized] return Ans; ^