View Compilation Error

0_0_20446183_32609.cpp: In function 'void update(int, int, int)':
0_0_20446183_32609.cpp:21:13: error: 'pushdown' was not declared in this scope
   pushdown(o);
             ^
0_0_20446183_32609.cpp:23:17: error: 'pushup' was not declared in this scope
   else pushup(lc);
                 ^
0_0_20446183_32609.cpp:25:17: error: 'pushup' was not declared in this scope
   else pushup(lr);
                 ^
0_0_20446183_32609.cpp:27:10: error: 'pushup' was not declared in this scope
  pushup(o);
          ^