/in/foo.cc: In function 'int main()':
/in/foo.cc:6:3: error: 'cout' was not declared in this scope
   cout << "输入大小：" << endl;
   ^
/in/foo.cc:6:32: error: 'endl' was not declared in this scope
   cout << "输入大小：" << endl;
                                ^
/in/foo.cc:7:3: error: 'cin' was not declared in this scope
   cin >> a[m] >> a[m + 1];
   ^
/in/foo.cc:21:3: error: 'cout' was not declared in this scope
   cout << "星星数量："<<temp << endl;
   ^
/in/foo.cc:21:38: error: 'endl' was not declared in this scope
   cout << "星星数量："<<temp << endl;
                                      ^