Cplusplus - Tree- Binary Tree Right side View

algorithms/CPlusPlus/Trees/Binary-Tree-Right-Side-View.cpp

@@ -0,0 +1,103 @@
+//Print the list of all the nodes visible when the binary tree is observed from the right side. 
+//Starting from the top , i.e. the root node. 
+
+#include <iostream>
+#include <queue>
+#include <vector>
+
+using namespace std;
+
+// Node structure for tree
+struct TreeNode {
+    int val;
+    TreeNode *left;
+    TreeNode *right;
+
+    TreeNode(int val) {
+        this->val = val;
+        left = nullptr;
+        right = nullptr;
+    }
+};
+
+
+void rightsideview(TreeNode * root)
+{
+	vector<int> ans;
+
+        TreeNode* curr;
+        
+        curr=root;
+        queue<TreeNode*> que;
+
+        que.push(curr);
+
+        while(!que.empty())
+        {
+            int s=que.size();
+
+            for(int i=0;i<s;i++)
+            {
+                curr=que.front();
+                que.pop();
+                if(curr->left!=NULL)
+                    que.push(curr->left);
+                if(curr->right!=NULL)
+                    que.push(curr->right);
+            }
+
+            ans.push_back(curr->val);
+        }
+
+
+	
+	for(int i=0;i<ans.size();i++)
+	{
+		cout<<ans[i]<<"\t";
+	}
+	cout<<endl;
+
+}
+
+int main()
+{
+	TreeNode * root= new TreeNode(1), * curr;
+	root->left=new TreeNode(2);
+	root->right= new TreeNode(3);
+
+	curr=root->right;
+	curr->left= new TreeNode(4);
+
+	curr=root->left;
+
+	curr->left= new TreeNode(5);
+	
+	curr->left->left= new TreeNode(6);
+
+	curr=curr->left->left;
+
+	curr->left= new TreeNode(7);
+	curr->left->right= new TreeNode(8);
+	curr->left->left=new TreeNode(9);
+
+
+	//			 1
+	//			/ \
+	//		       2   3
+	//		      /    /
+	//		      5   4
+	//		     /
+	//		     6
+	//		    /
+	//		    7
+	//		   / \
+	//		   9  8
+
+	
+	// 		The Output Should be -> 1, 3, 4, 6, 7, 8;
+	
+	
+
+	rightsideview(root);  // This function prints the result;
+	return 0;
+}