diff --git a/src/__init__.py b/src/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/stack/CQueue.py b/src/stack/CQueue.py
new file mode 100644
index 0000000..89e9620
--- /dev/null
+++ b/src/stack/CQueue.py
@@ -0,0 +1,62 @@
+# 使用两个栈构建一个队列
+class MinStack(object):
+    count = 0
+    def getCount(self):
+        return self.count
+    def __init__(self):
+        self.stack=[]
+    def push(self,value):
+        self.count +=1
+        if not self.stack:
+            self.stack.append((value,value))
+        else:
+            self.stack.append((value,min(value,self.stack[-1][1])))
+    def pop(self):
+        self.count -=1
+        self.stack.pop()[0]
+    def top(self):
+        return self.stack[-1][0]
+    def getMin(self):
+        return self.stack[-1][1]
+
+class CQueue(object):
+    def getCount(self):
+        return self.minStack.getCount()
+    def __init__(self):
+        self.minStack = MinStack()
+        self.tempMinStack = MinStack()
+
+    def appendTail(self, value):
+        self.minStack.push(value)
+    def deleteHead(self):
+        if self.tempMinStack.getCount()!=0:
+            temp = self.tempMinStack.top()
+            self.tempMinStack.pop()
+            return temp
+        count = self.minStack.getCount()
+        if count == 0:
+            return -1
+        for i in range(count):
+            value =self.minStack.top()
+            self.minStack.pop()
+            self.tempMinStack.push(value)
+        temp =self.tempMinStack.top()
+        self.tempMinStack.pop()
+        return temp
+if __name__ == '__main__':
+    test = CQueue()
+
+    print(test.deleteHead())
+    test.appendTail("5")
+    test.appendTail("2")
+    print(test.deleteHead())
+    # print(test.getCount())
+    print(test.deleteHead())
+    # print(test.getCount())
+    # test.appendTail("c")
+    # print(test.getCount())
+    # print(test.deleteHead())
+    # print(test.getCount())
+    # print(test.deleteHead())
+
+
diff --git a/src/stack/__init__.py b/src/stack/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/stack/binaryTreeNode.py b/src/stack/binaryTreeNode.py
new file mode 100644
index 0000000..14640ec
--- /dev/null
+++ b/src/stack/binaryTreeNode.py
@@ -0,0 +1,20 @@
+class Solution(object):
+    result = []
+    i=0
+    def inorderTraversal(self, root):
+        top = root[self.i]
+        if len(root) == self.i:
+            return
+        if root[self.i+1] is not None:
+            self.result.append(root[self.i+1])
+            self.i+=1
+            self.inorderTraversal(root)
+        else:
+            self.result.append(root[self.i])
+            self.i+=2
+            self.inorderTraversal(root)
+if __name__ == '__main__':
+    test = Solution()
+    root = [1, None, 2, 3]
+    test.inorderTraversal(root)
+    print(test.result)
diff --git a/src/stack/fib.py b/src/stack/fib.py
new file mode 100644
index 0000000..b9bf2c8
--- /dev/null
+++ b/src/stack/fib.py
@@ -0,0 +1,14 @@
+class Solution(object):
+    def fib(self,n):
+        a,b = 0,1
+        if n <2:
+            return n
+        for i in range(n):
+            if i >=2:
+                temp = a
+                a =b
+                b= temp+b
+        return  (a+b)%1000000007
+if __name__ == '__main__':
+    solution = Solution()
+    print(solution.fib(51))
\ No newline at end of file
diff --git a/src/stack/minStack.py b/src/stack/minStack.py
index 002e2a7..aa6ab57 100644
--- a/src/stack/minStack.py
+++ b/src/stack/minStack.py
@@ -1,12 +1,17 @@
-class MinStack:
+class MinStack(object):
+    count = 0
+    def getCount(self):
+        return self.count
     def __init__(self):
         self.stack=[]
     def push(self,value):
+        self.count +=1
         if not self.stack:
             self.stack.append((value,value))
         else:
             self.stack.append((value,min(value,self.stack[-1][1])))
     def pop(self):
+        self.count -=1
         self.stack.pop()[0]
     def top(self):
         return self.stack[-1][0]
@@ -14,10 +19,20 @@ def getMin(self):
         return self.stack[-1][1]
 if __name__ == '__main__':
     test = MinStack()
-    test.push(-2)
-    test.push(0)
-    test.push(-3)
+    test.push("a")
+    print(test.getCount())
+    test.push("b")
+    print(test.getCount())
+    test.push("c")
+    print(test.getCount())
+    print("test")
     print(test.getMin())
     print(test.pop())
+    print(test.getCount())
     print(test.top())
-    print(test.getMin())
\ No newline at end of file
+    print(test.getCount())
+    print(test.getMin())
+    print(test.getCount())
+    print(test.pop())
+    print(test.getCount())
+