View Compilation Error

0_0_39676464_5532.cpp: In function 'void solution()':
0_0_39676464_5532.cpp:4:5: error: 'cin' was not declared in this scope
    4 |     cin>>n;
      |     ^~~
0_0_39676464_5532.cpp:12:5: error: 'cout' was not declared in this scope
   12 |     cout<<num<<endl;
      |     ^~~~
0_0_39676464_5532.cpp:12:16: error: 'endl' was not declared in this scope
   12 |     cout<<num<<endl;
      |                ^~~~