View Compilation Error

0_0_29869831_8731.cpp: In function 'std::vector<int> polysub(std::vector<int>, std::vector<int>)':
0_0_29869831_8731.cpp:152:32: error: expected ')' at end of input
  for (int i=0; i<a.size(); i++%2
                                ^
0_0_29869831_8731.cpp:152:32: error: expected statement at end of input
0_0_29869831_8731.cpp:152:32: error: expected '}' at end of input