/in/foo.cc:8:7: error: invalid preprocessing directive #�
     # 计算最大购买数量
       ^
/in/foo.cc:10:7: error: invalid preprocessing directive #�
     # 由于需要购买相同数量的两种商品，取较小值作为最终结果
       ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:7:2: error: 'def' was not declared in this scope
  def max_items(n, a, b):
  ^~~