View Compilation Error

0_0_36413637_10089.cpp: In function 'void init()':
0_0_36413637_10089.cpp:27:33: error: too many arguments to function 'int qpow(int, int)'
   int inv = qpow(i, mod - 2, mod);
                                 ^
0_0_36413637_10089.cpp:14:5: note: declared here
 int qpow(int a, int n) {
     ^