View Compilation Error

0_0_38190248_27081.cpp: In function 'int main()':
0_0_38190248_27081.cpp:16:7: error: 'cin' was not declared in this scope
 while(cin>>n)
       ^
0_0_38190248_27081.cpp:18:1: error: 'cout' was not declared in this scope
 cout<<b[a[n]]<<endl;
 ^
0_0_38190248_27081.cpp:18:16: error: 'endl' was not declared in this scope
 cout<<b[a[n]]<<endl;
                ^