modify code

Author: algorithmzuo

src/class183/Code02_Tree1.java renamed to src/class183/Code02_PairNumber1.java

@@ -10,7 +10,7 @@
 import java.io.PrintWriter;
 import java.util.Arrays;
 
-public class Code02_Tree1 {
+public class Code02_PairNumber1 {
 
 	public static int MAXN = 50001;
 	public static int n, k, total;

src/class183/Code04_TreeGame1.java

@@ -0,0 +1,8 @@
+package class183;
+
+// 树上游戏，java版
+// 测试链接 : https://www.luogu.com.cn/problem/P2664
+
+public class Code04_TreeGame1 {
+
+}