View Compilation Error

0_0_7073409_31863.cpp: In function `int main()':
0_0_7073409_31863.cpp:25: error: invalid application of `sizeof' to incomplete type `Q' 
0_0_7073409_31863.cpp:29: error: expected primary-expression before '[' token
0_0_7073409_31863.cpp:29: error: expected primary-expression before '[' token