diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 00000000..30cf57ed
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,10 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Ignored default folder with query files
+/queries/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
diff --git a/.idea/Design-2.iml b/.idea/Design-2.iml
new file mode 100644
index 00000000..269e64b8
--- /dev/null
+++ b/.idea/Design-2.iml
@@ -0,0 +1,10 @@
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/inspectionProfiles/profiles_settings.xml b/.idea/inspectionProfiles/profiles_settings.xml
new file mode 100644
index 00000000..105ce2da
--- /dev/null
+++ b/.idea/inspectionProfiles/profiles_settings.xml
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 00000000..326eb419
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,4 @@
+
+
+
+
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 00000000..45ca9fd1
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 00000000..35eb1ddf
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/hashmap.py b/hashmap.py
new file mode 100644
index 00000000..82b082d6
--- /dev/null
+++ b/hashmap.py
@@ -0,0 +1,27 @@
+class MyHashMap:
+
+ def __init__(self):
+ self.map = [-1] * (10 ** 6 + 1)
+
+ def put(self, key: int, value: int) -> None:
+ self.map[key] = value
+
+ def get(self, key: int) -> int:
+ return self.map[key]
+
+ def remove(self, key: int) -> None:
+ self.map[key] = -1
+
+# Your MyHashMap object will be instantiated and called as such:
+# obj = MyHashMap()
+# obj.put(key,value)
+# param_2 = obj.get(key)
+# obj.remove(key)
+
+# Time complexity
+# put O(1)
+# get O(1)
+# remove O(1)
+
+#Space Complexity:
+# O(10^6)
\ No newline at end of file
diff --git a/queue_from_stack.py b/queue_from_stack.py
new file mode 100644
index 00000000..b3826fe4
--- /dev/null
+++ b/queue_from_stack.py
@@ -0,0 +1,37 @@
+class MyQueue:
+
+ def __init__(self):
+ self.inStack = []
+ self.outStack = []
+
+ def push(self, x: int) -> None:
+ self.inStack.append(x)
+
+ def pop(self) -> int:
+ self.peek()
+ return self.outStack.pop()
+
+ def peek(self) -> int:
+ if not self.outStack:
+ while self.inStack:
+ self.outStack.append(self.inStack.pop())
+ return self.outStack[-1]
+
+ def empty(self) -> bool:
+ return not self.inStack and not self.outStack
+
+# Your MyQueue object will be instantiated and called as such:
+# obj = MyQueue()
+# obj.push(x)
+# param_2 = obj.pop()
+# param_3 = obj.peek()
+# param_4 = obj.empty()
+
+# Time complexity:
+# push O(1)
+# pop O(1)
+# peek O(1)
+# empty O(1)
+
+# Space Complexity:
+# O(n)
\ No newline at end of file