linglu
diff --git a/‎data_structures/binary tree/AVLtree.py‎
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+# -*- coding: utf-8 -*-
+import math
+class my_queue:
+    def __init__(self):
+        self.data = []
+        self.head = 0
+        self.tail = 0
+    def isEmpty(self):
+        return self.head == self.tail
+    def push(self,data):
+        self.data.append(data)
+        self.tail = self.tail + 1
+    def pop(self):
+        ret = self.data[self.head]
+        self.head = self.head + 1
+        return ret
+    def count(self):
+        return self.tail - self.head
+    def print(self):
+        print(self.data)
+        print("**************")
+        print(self.data[self.head:self.tail])
+        
+class my_node:
+    def __init__(self,data):
+        self.data = data
+        self.left = None
+        self.right = None
+        self.height = 1
+    def getdata(self):
+        return self.data
+    def getleft(self):
+        return self.left
+    def getright(self):
+        return self.right
+    def getheight(self):
+        return self.height
+    def setdata(self,data):
+        self.data = data
+        return
+    def setleft(self,node):
+        self.left = node
+        return
+    def setright(self,node):
+        self.right = node
+        return
+    def setheight(self,height):
+        self.height = height
+        return
+
+def getheight(node):
+#    print("xxx")
+    if node is None:
+        return 0
+    return node.getheight()
+
+def my_max(a,b):
+    if a > b:
+        return a
+    return b
+
+
+
+def leftrotation(node):
+    ret = node.getleft()
+    node.setleft(ret.getright())
+    ret.setright(node)
+    h1 = my_max(getheight(node.getright()),getheight(node.getleft())) + 1
+    node.setheight(h1)
+    h2 = my_max(getheight(ret.getright()),getheight(ret.getleft())) + 1         
+    ret.setheight(h2)
+    return ret
+
+def rightrotation(node):
+    ret = node.getright()
+    node.setright(ret.getleft())
+    ret.setleft(node)
+    h1 = my_max(getheight(node.getright()),getheight(node.getleft())) + 1
+    node.setheight(h1)
+    h2 = my_max(getheight(ret.getright()),getheight(ret.getleft())) + 1         
+    ret.setheight(h2)
+    return ret
+
+def lrrotation(node):
+    node.setright(leftrotation(node.getright()))
+    return rightrotation(node)
+
+def rlrotation(node):
+    node.setleft(rightrotation(node.getleft()))
+    return leftrotation(node)
+
+def insert_node(node,data):
+    if node is None:
+        return my_node(data)
+    if data < node.getdata():
+        node.setleft(insert_node(node.getleft(),data))
+        if getheight(node.getleft()) - getheight(node.getright()) == 2:
+            if data < node.getleft().getdata():
+                node = leftrotation(node)
+            else:
+                node = rlrotation(node)
+    else:
+        node.setright(insert_node(node.getright(),data))
+        if getheight(node.getright()) - getheight(node.getleft()) == 2:
+            if data < node.getright().getdata():
+                node = lrrotation(node)
+            else:
+                node = rightrotation(node)
+    h1 = my_max(getheight(node.getright()),getheight(node.getleft())) + 1
+    node.setheight(h1)
+    return node
+
+class AVLtree:
+    def __init__(self):
+        self.root = None
+    def getheight(self):
+#        print("yyy")
+        return getheight(self.root)
+    def insert(self,data):
+        self.root = insert_node(self.root,data)
+    def traversale(self):
+        q = my_queue()
+        q.push(self.root)
+        layer = self.getheight()
+        cnt = 0
+        while not q.isEmpty():
+            node = q.pop()
+            space = " "*int(math.pow(2,layer) - 1)
+            print(space,end = " ")
+            if node is None:
+                print("*",end = " ")
+            else:
+                print(node.getdata(),end = " ")
+                q.push(node.getleft())
+                q.push(node.getright())
+            print(space,end = " ")
+            cnt = cnt + 1
+            for i in range(100):
+                if cnt == math.pow(2,i) - 1:
+                    layer = layer -1 
+                    print()
+                    break
+        print()
+        print("*************************************")
+        return
+    
+    def test(self):
+        getheight(None)
+        print("****")
+        self.getheight()
+if __name__ == "__main__":
+#    t = AVLtree()
+#    t.test()
+#    q = my_queue()
+##    q.push(1)
+##    q.push(2)
+#    for i in range(10):
+#        q.push(i)
+#    q.print()
+#    q.push(90)
+#    q.print()
+#    
+#    q.pop()
+#    q.print()
+    t = AVLtree()
+    t.traversale()
+#    t.insert(7)
+#    t.traversale()
+    
+    t.insert(8)
+    t.traversale()
+    t.insert(3)
+    t.traversale()
+    t.insert(6)
+    t.traversale()
+    t.insert(1)
+    t.traversale()
+    t.insert(10)
+    t.traversale()
+    t.insert(14)
+    t.traversale()
+    t.insert(13)
+    t.traversale()
+#    t.traversale()
+    t.insert(4)
+    t.traversale()
+    t.insert(7)
+    t.traversale()
+    
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