View Compilation Error

0_0_23406166_23098.cpp:1:1: error: 'package' does not name a type
 package HDOJ_homework;
 ^
0_0_23406166_23098.cpp:3:1: error: 'import' does not name a type
 import java.util.LinkedList;
 ^
0_0_23406166_23098.cpp:4:1: error: 'import' does not name a type
 import java.util.Queue;
 ^
0_0_23406166_23098.cpp:5:1: error: 'import' does not name a type
 import java.util.Scanner;
 ^
0_0_23406166_23098.cpp:8:1: error: expected unqualified-id before 'public'
 public class p3549 {
 ^