Complete Design-1

Design HashMap.java

@@ -0,0 +1,69 @@
+// Time Complexity :
+// Space Complexity :
+// Did this code successfully run on Leetcode :
+// Any problem you faced while coding this :
+
+
+// Your code here along with comments explaining your approach
+
+
+
+//Leetcode 706. Design HashMap
+
+class MyHashSet {
+    int primaryb;
+    int secondaryb;
+    boolean storage[][];
+    public MyHashSet() {
+        this.primaryb = 1000;
+        this.secondaryb = 1000;
+        this.storage = new boolean[primaryb][];
+    }
+    private int getprimaryhash(int key){
+        return key%primaryb;
+    }
+    private int getsecondaryhash(int key){
+        return key/secondaryb;
+    }
+
+    public void add(int key) {
+    int primaryIndex = getprimaryhash(key);
+
+    if(storage[primaryIndex] == null){
+        if(primaryIndex == 0){
+            storage[primaryIndex] = new boolean[secondaryb + 1];
+        } else {
+            storage[primaryIndex] = new boolean[secondaryb];
+        }
+    }
+
+    int secondaryIndex = getsecondaryhash(key);
+    storage[primaryIndex][secondaryIndex] = true;
+}
+
+    public void remove(int key) {
+    int primaryIndex = getprimaryhash(key);
+
+    if(storage[primaryIndex] == null){
+        return;
+    }
+
+    int secondaryIndex = getsecondaryhash(key);
+    storage[primaryIndex][secondaryIndex] = false;
+}
+
+    public boolean contains(int key) {
+        int primaryIndex= getprimaryhash(key);
+        if(storage[primaryIndex]==null){return false;}
+        int secondaryIndex = getsecondaryhash(key);
+       return storage[primaryIndex][secondaryIndex];
+    }
+}
+
+/**
+ * Your MyHashSet object will be instantiated and called as such:
+ * MyHashSet obj = new MyHashSet();
+ * obj.add(key);
+ * obj.remove(key);
+ * boolean param_3 = obj.contains(key);
+ */

MinStack.java

@@ -0,0 +1,41 @@
+class MinStack {
+    Stack<Integer> st;
+    Stack<Integer> minst;
+
+    int min;
+    public MinStack() {
+        this.st = new Stack<>();
+        this.minst = new Stack<>();
+        this.min = Integer.MAX_VALUE;
+    }
+
+    public void push(int val) {
+        min = Math.min(min,val);
+        st.push(val);
+        minst.push(min);
+    }
+
+    public void pop() {
+        st.pop();
+        minst.pop();
+        min = minst.peek();
+    }
+
+    public int top() {
+        return st.peek();
+
+    }
+
+    public int getMin() {
+        return min;
+    }
+}
+
+/**
+ * Your MinStack object will be instantiated and called as such:
+ * MinStack obj = new MinStack();
+ * obj.push(val);
+ * obj.pop();
+ * int param_3 = obj.top();
+ * int param_4 = obj.getMin();
+ */