View Compilation Error

0_0_19216702_10313.cpp: In function 'int main()':
0_0_19216702_10313.cpp:30:2: error: 'cin' was not declared in this scope
  cin>>T;
  ^
0_0_19216702_10313.cpp:34:15: error: 'cout' was not declared in this scope
   if(flag[n]) cout<<"NO"<<endl;
               ^
0_0_19216702_10313.cpp:34:27: error: 'endl' was not declared in this scope
   if(flag[n]) cout<<"NO"<<endl;
                           ^
0_0_19216702_10313.cpp:35:9: error: 'cout' was not declared in this scope
   else  cout<<"YES"<<endl;
         ^
0_0_19216702_10313.cpp:35:22: error: 'endl' was not declared in this scope
   else  cout<<"YES"<<endl;
                      ^