View Compilation Error

0_0_15971887_16760.cpp: In function 'int main()':
0_0_15971887_16760.cpp:16:2: error: 'cin' was not declared in this scope
  cin>>n;
  ^
0_0_15971887_16760.cpp:20:3: error: 'cout' was not declared in this scope
   cout<<++j<<" "<<f[i]<<endl;
   ^
0_0_15971887_16760.cpp:20:25: error: 'endl' was not declared in this scope
   cout<<++j<<" "<<f[i]<<endl;
                         ^