View Compilation Error

0_0_31675487_12321.cpp: In function 'int main()':
0_0_31675487_12321.cpp:33:5: error: 'ios' has not been declared
     ios::sync_with_stdio(false);
     ^
0_0_31675487_12321.cpp:34:8: error: 'cin' was not declared in this scope
  while(cin>>n>>m)
        ^
0_0_31675487_12321.cpp:62:3: error: 'cout' was not declared in this scope
   cout<<"-1"<<endl;
   ^
0_0_31675487_12321.cpp:62:15: error: 'endl' was not declared in this scope
   cout<<"-1"<<endl;
               ^
0_0_31675487_12321.cpp:65:7: error: 'cout' was not declared in this scope
       cout<<arr[i]<<" ";
       ^
0_0_31675487_12321.cpp:66:4: error: 'cout' was not declared in this scope
    cout<<arr[cnt-1]<<endl;
    ^
0_0_31675487_12321.cpp:66:22: error: 'endl' was not declared in this scope
    cout<<arr[cnt-1]<<endl;
                      ^