MinStack day10

Author: KB-perByte

Leetcode_30days/day10_MinStack.py

@@ -0,0 +1,52 @@
+class MinStack(object):
+
+    def __init__(self):
+        """
+        initialize your data structure here.
+        """
+        self.A =[]
+
+    def push(self, x):
+        """
+        :type x: int
+        :rtype: None
+        """
+        self.A.append(x)
+        
+
+    def pop(self):
+        """
+        :rtype: None
+        """
+        if self.A:
+            self.A.pop()
+        
+
+    def top(self):
+        """
+        :rtype: int
+        """
+        if self.A:
+            return self.A[-1]
+        else:
+            return None
+            
+        
+
+    def getMin(self):
+        """
+        :rtype: int
+        """
+        if self.A:
+            return min(self.A)
+        else:
+            return None
+        
+
+
+# Your MinStack object will be instantiated and called as such:
+# obj = MinStack()
+# obj.push(x)
+# obj.pop()
+# param_3 = obj.top()
+# param_4 = obj.getMin()