View Compilation Error

0_0_27550858_25062.cpp: In function 'void add(int, int)':
0_0_27550858_25062.cpp:9:29: error: 'lowbit' was not declared in this scope
  for(;pos<=n;pos+=lowbit(pos))
                             ^
0_0_27550858_25062.cpp: In function 'long long int query(int)':
0_0_27550858_25062.cpp:15:28: error: 'lowbit' was not declared in this scope
  for(;pos>0;pos-=lowbit(pos))
                            ^