View Compilation Error

0_0_29933055_28400.cpp: In function 'int main()':
0_0_29933055_28400.cpp:242:19: error: 'n' was not declared in this scope
     while (cin >> n >> q) {
                   ^
0_0_29933055_28400.cpp:242:24: error: 'q' was not declared in this scope
     while (cin >> n >> q) {
                        ^
0_0_29933055_28400.cpp:246:6: error: 'coef' was not declared in this scope
      coef[_] = mul(mul(mo - mul(b, c), power(a, n)), 
      ^
0_0_29933055_28400.cpp:247:2: error: expected primary-expression before '}' token
  }
  ^