View Compilation Error

0_0_34609859_20322.cpp: In function 'void pre()':
0_0_34609859_20322.cpp:26:10: error: 'n' was not declared in this scope
  rep(i,1,n) ni[i]=qsm(i,P-2);
          ^
0_0_34609859_20322.cpp:6:39: note: in definition of macro 'rep'
 #define rep(i,a,b) for (int i=(a);i<=(b);i++)
                                       ^