View Compilation Error

0_0_23039169_11685.cpp: In function 'int main()':
0_0_23039169_11685.cpp:17:5: error: 'cin' was not declared in this scope
     cin >> s;
     ^
0_0_23039169_11685.cpp:44:25: error: 'cout' was not declared in this scope
                         cout << ans[a];
                         ^
0_0_23039169_11685.cpp:47:25: error: 'cout' was not declared in this scope
                         cout << a;
                         ^
0_0_23039169_11685.cpp:49:21: error: 'cout' was not declared in this scope
                     cout << str[i];
                     ^
0_0_23039169_11685.cpp:57:9: error: 'cout' was not declared in this scope
         cout << endl;
         ^
0_0_23039169_11685.cpp:57:17: error: 'endl' was not declared in this scope
         cout << endl;
                 ^