View Compilation Error

0_0_15512863_22910.cpp: In function 'void cdq(int, int)':
0_0_15512863_22910.cpp:73:13: error: 'cdq1' was not declared in this scope
  cdq1(l, mid);
             ^
0_0_15512863_22910.cpp: In function 'int main()':
0_0_15512863_22910.cpp:99:12: error: 'cdq1' was not declared in this scope
   cdq1(1, n);
            ^