View Compilation Error

0_0_15771261_20724.cpp: In function 'int main()':
0_0_15771261_20724.cpp:19:5: error: 'cin' was not declared in this scope
     cin>>T;
     ^
0_0_15771261_20724.cpp:30:17: error: 'cout' was not declared in this scope
         if(flag)cout<<"YES"<<endl;
                 ^
0_0_15771261_20724.cpp:30:30: error: 'endl' was not declared in this scope
         if(flag)cout<<"YES"<<endl;
                              ^
0_0_15771261_20724.cpp:31:14: error: 'cout' was not declared in this scope
         else cout<<"NO"<<endl;
              ^
0_0_15771261_20724.cpp:31:26: error: 'endl' was not declared in this scope
         else cout<<"NO"<<endl;
                          ^