diff --git a/Solution.py b/Solution.py
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+++ b/Solution.py
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+## Design -1 
+## Problem 1:(https://leetcode.com/problems/design-hashset/)
+# Time Complexity : O(1)
+# Space Complexity : O(1)
+# Did this code successfully run on Leetcode : yes
+# Any problem you faced while coding this : no
+class MyHashSet(object):
+
+    def __init__(self):
+        self.primary= 1000
+        self.nested = 1001
+        self.storage = [None] * self.primary
+
+    def hash1(self,key):
+        return key% self.primary
+    
+    def hash2(self,key):
+        return key/self.nested
+
+    def add(self, key):
+        """
+        :type key: int
+        :rtype: None
+        """
+        ## checking if key in primary
+        bucket = self.hash1(key)
+        nestedbucket = self.hash2(key)
+
+        if self.storage[bucket] == None:
+            self.storage[bucket] = [False]*self.nested
+        
+        self.storage[bucket][nestedbucket] = True
+
+        
+
+    def remove(self, key):
+        """
+        :type key: int
+        :rtype: None
+        """
+        bucket = self.hash1(key)
+        nestedbucket = self.hash2(key)
+
+        if self.storage[bucket] == None:
+            return
+        self.storage[bucket][nestedbucket] = False
+
+
+    def contains(self, key):
+        """
+        :type key: int
+        :rtype: bool
+        """
+        bucket = self.hash1(key)
+        nestedbucket = self.hash2(key)
+
+        if self.storage[bucket] == None:
+            return False
+        return self.storage[bucket][nestedbucket]
+
+
+# Your MyHashSet object will be instantiated and called as such:
+# obj = MyHashSet()
+# obj.add(key)
+# obj.remove(key)
+# param_3 = obj.contains(key)
+
+####################################################
+
+
+# Problem 2:
+# Design MinStack (https://leetcode.com/problems/min-stack/)
+# Time Complexity : O(1)
+# Space Complexity : O(1)
+# Did this code successfully run on Leetcode : yes
+# Any problem you faced while coding this : no
+
+
+class MinStack(object):
+
+    def __init__(self):
+        self.stack = deque()
+        self.minstack = deque()
+        self.min = float('inf')
+        self.minstack.append(self.min)
+    
+    def push(self, val):
+        """
+        :type val: int
+        :rtype: None
+        """
+        self.stack.append(val)
+        if val <= self.min:
+            self.minstack.append(val)
+            self.min = val
+        
+        
+
+    def pop(self):
+        """
+        :rtype: None
+        """
+        val = self.stack.pop()
+        if val == self.min:
+            self.minstack.pop()
+            self.min = self.minstack[-1]
+        
+
+
+    def top(self):
+        """
+        :rtype: int
+        """
+        return self.stack[-1]
+
+    def getMin(self):
+        """
+        :rtype: int
+        """
+        return self.min
+
+
+# Your MinStack object will be instantiated and called as such:
+# obj = MinStack()
+# obj.push(val)
+# obj.pop()
+# param_3 = obj.top()
+# param_4 = obj.getMin()
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