View Compilation Error

0_0_18894524_20514.cpp: In function 'int main()':
0_0_18894524_20514.cpp:10:2: error: 'cin' was not declared in this scope
  cin>>n;
  ^
0_0_18894524_20514.cpp:21:3: error: 'cout' was not declared in this scope
   cout<<sub<<endl;
   ^
0_0_18894524_20514.cpp:21:14: error: 'endl' was not declared in this scope
   cout<<sub<<endl;
              ^