View Compilation Error

0_0_33530502_24520.cpp: In function 'void update(int&, int, int, int, int)':
0_0_33530502_24520.cpp:36:15: error: 'mid' was not declared in this scope
     if(pos <= mid) update(lc[p], l, mid, pos, x);
               ^
0_0_33530502_24520.cpp: In function 'int qry(int, int, int)':
0_0_33530502_24520.cpp:43:20: error: 'mid' was not declared in this scope
     if(a[lc[p]] < (mid-l+1)) return qry(lc[p], l, mid);
                    ^