View Compilation Error

0_0_36081613_14046.cpp: In function 'int main()':
0_0_36081613_14046.cpp:13:2: error: 'cin' was not declared in this scope
  cin>>n;
  ^
0_0_36081613_14046.cpp:25:3: error: 'cout' was not declared in this scope
   cout<<nn[i];
   ^