Implement Queue and HahsMap

MyHashMap.java

@@ -0,0 +1,79 @@
+// Time Complexity :  O(1) average
+// Space Complexity :O(n + 10000)
+// Did this code successfully run on Leetcode : yes 
+// Any problem you faced while coding this : No
+
+
+// Your code here along with comments explaining your approach
+class MyHashMap {
+
+    class Node{
+        int key, val;
+        Node next;
+
+        public Node(int key, int val){
+            this.key = key;
+            this.val = val;
+        }
+    }
+
+    private Node[] storage;
+
+    public MyHashMap() {
+        this.storage = new Node[10000];
+    }
+
+    public int hash(int key){
+        return key%10000;
+    }
+
+    public Node find(Node head, int key){
+        Node prev = null;
+        Node curr = head;
+        while(curr != null && curr.key != key){
+            prev = curr;
+            curr = curr.next;
+        }
+
+        return prev;
+    }
+
+    public void put(int key, int value) {
+        int idx = hash(key);
+        if(storage [idx] == null){
+            storage[idx] = new Node(-1,-1);
+        }
+
+        Node prev = find(storage[idx], key);
+        if(prev.next !=null){
+            prev.next.val = value;
+        }else{
+            prev.next = new Node(key,value);
+        }
+    }
+
+    public int get(int key) {
+        int idx = hash(key);
+        if(storage[idx] == null) return -1;
+        Node prev = find(storage[idx], key);
+
+        if(prev.next !=null){
+           return  prev.next.val;
+        }
+
+        return -1;
+    }
+
+    public void remove(int key) {
+        int idx = hash(key);
+        if(storage[idx] == null){
+            return;
+        }
+        Node prev = find(storage[idx], key);
+        if(prev.next == null){
+            return;
+        }
+        prev.next = prev.next.next;
+    }
+}
+

MyQueue.java

@@ -0,0 +1,55 @@
+// Time Complexity :  O(1) average
+// Space Complexity :O(n)
+// Did this code successfully run on Leetcode : yes 
+// Any problem you faced while coding this : No
+
+class MyQueue {
+
+    Stack<Integer> in;
+    Stack<Integer> out;
+    public MyQueue() {
+        in = new Stack<>();
+        out = new Stack<>();
+    }
+
+    public void push(int x) {
+        in.push(x);
+    }
+
+    public int pop() {
+        if(out.isEmpty()){
+            while(!in.isEmpty()){
+               out.push(in.pop());
+            }
+        }
+        return out.pop();
+    }
+
+    public int peek() {
+        if(out.isEmpty()){
+            while(!in.isEmpty()){
+                out.push(in.pop());
+            }
+        }
+
+        return out.peek();
+    }
+
+    public boolean empty() {
+
+        if(in.isEmpty() && out.isEmpty()){
+            return true;
+        }
+
+        return false;
+    }
+}
+
+/**
+ * Your MyQueue object will be instantiated and called as such:
+ * MyQueue obj = new MyQueue();
+ * obj.push(x);
+ * int param_2 = obj.pop();
+ * int param_3 = obj.peek();
+ * boolean param_4 = obj.empty();
+ */