View Compilation Error

0_0_14063605_4082.cpp: In function 'void update(int, int, int, int)':
0_0_14063605_4082.cpp:52:16: error: 'push_down' was not declared in this scope
     push_down(n);
                ^
0_0_14063605_4082.cpp: In function 'db query(int, int, int)':
0_0_14063605_4082.cpp:65:16: error: 'push_down' was not declared in this scope
     push_down(n);
                ^