View Compilation Error

0_0_29646701_12371.cpp: In function 'int main()':
0_0_29646701_12371.cpp:17:2: error: 'cin' was not declared in this scope
  cin>>T;
  ^
0_0_29646701_12371.cpp:35:3: error: 'cout' was not declared in this scope
   cout<<ans<<endl;
   ^
0_0_29646701_12371.cpp:35:14: error: 'endl' was not declared in this scope
   cout<<ans<<endl;
              ^