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kk.java

@@ -0,0 +1,97 @@
+import java.util.*;
+import java.io.*;
+
+class Node {
+    Node left;
+    Node right;
+    int data;
+
+    Node(int data) {
+        this.data = data;
+        left = null;
+        right = null;
+    }
+}
+
+class Solution {
+
+	/* 
+
+    class Node 
+    	int data;
+    	Node left;
+    	Node right;
+	*/
+
+	public static void topView(Node root) 
+    {
+        class queueobj
+        {
+            Node node;
+            int hd;
+
+            queueobj(Node node,int hd)
+            {
+                this.node=node;
+                this.hd=hd;
+            }
+        }
+        Queue<queueobj> q=new LinkedList<queueobj>();
+        Map<Integer,Node>m=new TreeMap<Integer,Node>();
+
+        if(root==null)
+            return;
+        else
+            q.add(new queueobj(root,0));
+
+        while(!q.isEmpty())
+        {
+            queueobj temp=q.poll();
+
+            if(!m.containsKey(temp.hd))
+            {
+                m.put(temp.hd,temp.node);
+            }
+            if(temp.node.left!=null)
+            {
+                 q.add(new queueobj(temp.node.left,temp.hd-1));
+            }
+            if(temp.node.right!=null)
+            {
+                 q.add(new queueobj(temp.node.right,temp.hd+1));
+            }
+        }
+        for(Map.Entry<Integer,Node> t:m.entrySet())
+        {
+            System.out.printf("%d ",t.getValue().data);
+        }
+    }
+
+	public static Node insert(Node root, int data) {
+        if(root == null) {
+            return new Node(data);
+        } else {
+            Node cur;
+            if(data <= root.data) {
+                cur = insert(root.left, data);
+                root.left = cur;
+            } else {
+                cur = insert(root.right, data);
+                root.right = cur;
+            }
+            return root;
+        }
+    }
+
+    public static void main(String[] args) {
+        Scanner scan = new Scanner(System.in);
+        int t = scan.nextInt();
+        Node root = null;
+        while(t-- > 0) {
+            int data = scan.nextInt();
+            root = insert(root, data);
+        }
+        scan.close();
+        topView(root);
+    }	
+}