1
5
10
15
Insert
1
5
10
15
0
1
2
3
Insert with rank
5
10
15
20
Create tree
1
5
10
15
Delete
1
5
10
15
Find
Back
Clear
Save
This key is already in the tree!
This key is not in the tree!
Tree is already created!
Use
Clear
and then try again.
Input must be positive integer!
1