View Compilation Error

0_0_36587511_19497.cpp: In function 'int main()':
0_0_36587511_19497.cpp:15:2: error: 'cin' was not declared in this scope
  cin>>N;
  ^
0_0_36587511_19497.cpp:29:17: error: 'sort' was not declared in this scope
   sort(r,r+n,cmp);    
                 ^
0_0_36587511_19497.cpp:43:3: error: 'cout' was not declared in this scope
   cout<<count*10<<endl;
   ^
0_0_36587511_19497.cpp:43:19: error: 'endl' was not declared in this scope
   cout<<count*10<<endl;
                   ^