View Compilation Error

0_0_28074186_31633.cpp: In function 'int main()':
0_0_28074186_31633.cpp:32:34: error: cannot convert 'long long int*' to 'int*' for argument '1' to 'int com_mul(int*, int)'
         printf("%d\n",com_mul(a,n));
                                  ^