View Compilation Error

0_0_26379029_2173.cpp:2:30: error: stray '#' in program
 <pre name="code" class="cpp">#include<iostream>
                              ^
0_0_26379029_2173.cpp:2:1: error: expected unqualified-id before '<' token
 <pre name="code" class="cpp">#include<iostream>
 ^
0_0_26379029_2173.cpp: In function 'int main()':
0_0_26379029_2173.cpp:8:2: error: 'cin' was not declared in this scope
  cin>>n;
  ^
0_0_26379029_2173.cpp:13:4: error: 'cout' was not declared in this scope
    cout<<"impossible"<<endl;
    ^
0_0_26379029_2173.cpp:13:24: error: 'endl' was not declared in this scope
    cout<<"impossible"<<endl;
                        ^
0_0_26379029_2173.cpp:15:4: error: 'cout' was not declared in this scope
    cout<<(a+b)/2<<" "<<(a-b)/2<<endl;
    ^
0_0_26379029_2173.cpp:15:33: error: 'endl' was not declared in this scope
    cout<<(a+b)/2<<" "<<(a-b)/2<<endl;
                                 ^