View Compilation Error

0_0_32474250_99.cpp: In function 'bool check()':
0_0_32474250_99.cpp:33:39: error: expected ')' at end of input
  for (int i = 2; i <= (2 * n + 1); i+=2
                                       ^
0_0_32474250_99.cpp:33:39: error: expected statement at end of input
0_0_32474250_99.cpp:33:39: error: expected '}' at end of input