View Compilation Error

0_0_31936355_18410.cpp:1:10: error: #include expects "FILENAME" or <FILENAME>
 #include "iostream"using namespace std ; 
          ^
0_0_31936355_18410.cpp: In function 'int main()':
0_0_31936355_18410.cpp:6:7: error: 'cin' was not declared in this scope
 while(cin>>n){   
       ^
0_0_31936355_18410.cpp:13:21: error: 'strcmp' was not declared in this scope
 if (strcmp(a[i],a[j])==0)    
                     ^
0_0_31936355_18410.cpp:21:2: error: 'cout' was not declared in this scope
  cout<<a[k]<<endl;     }  
  ^
0_0_31936355_18410.cpp:21:14: error: 'endl' was not declared in this scope
  cout<<a[k]<<endl;     }  
              ^
0_0_31936355_18410.cpp:23:16: error: 'system' was not declared in this scope
  system("pause");        
                ^