View Compilation Error

0_0_30764582_29523.cpp: In function 'int main()':
0_0_30764582_29523.cpp:7:2: error: 'cin' was not declared in this scope
  cin>>T;
  ^
0_0_30764582_29523.cpp:29:3: error: 'cout' was not declared in this scope
   cout<<mhe[i]<<" "<<mch[i]<<endl;
   ^
0_0_30764582_29523.cpp:29:30: error: 'endl' was not declared in this scope
   cout<<mhe[i]<<" "<<mch[i]<<endl;
                              ^