View Compilation Error

0_0_36428484_27946.cpp: In function 'int main()':
0_0_36428484_27946.cpp:16:11: error: 'cin' was not declared in this scope
     while(cin>>T){
           ^
0_0_36428484_27946.cpp:29:17: error: 'cout' was not declared in this scope
                 cout << size[y]-dis[x]-1<<endl;
                 ^
0_0_36428484_27946.cpp:29:43: error: 'endl' was not declared in this scope
                 cout << size[y]-dis[x]-1<<endl;
                                           ^