View Compilation Error

0_0_24975649_28700.cpp: In function 'void Build(int, int, int)':
0_0_24975649_28700.cpp:30:17: error: 'm' was not declared in this scope
     PushDown(rt,m-l+1,r-m);
                 ^
0_0_24975649_28700.cpp:30:26: error: 'PushDown' was not declared in this scope
     PushDown(rt,m-l+1,r-m);
                          ^