diff --git a/Ch_4_3_Minimum_Spanning_Trees/Practise_4_3_07.java b/Ch_4_3_Minimum_Spanning_Trees/Practise_4_3_07.java
new file mode 100644
index 0000000..1abf72a
--- /dev/null
+++ b/Ch_4_3_Minimum_Spanning_Trees/Practise_4_3_07.java
@@ -0,0 +1,9 @@
+package Ch_4_3_Minimum_Spanning_Trees;
+
+public class Practise_4_3_07 {
+    public static void main(String[] args) {
+        /*
+         * 将最小堆改为最大堆即可
+         */
+    }
+}
diff --git a/Ch_4_3_Minimum_Spanning_Trees/Practise_4_3_08.java b/Ch_4_3_Minimum_Spanning_Trees/Practise_4_3_08.java
new file mode 100644
index 0000000..0ce5113
--- /dev/null
+++ b/Ch_4_3_Minimum_Spanning_Trees/Practise_4_3_08.java
@@ -0,0 +1,7 @@
+package Ch_4_3_Minimum_Spanning_Trees;
+
+public class Practise_4_3_08 {
+    public static void main(String[] args) {
+        
+    }
+}