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data_structure/morrisinorder.cpp

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+#include <iostream>
+#include <queue>
+
+/**************************
+	@author shrutisheoran
+**************************/
+
+using namespace std;
+
+struct Btree
+{
+	int data;
+	struct Btree *left;  //Pointer to left subtree
+	struct Btree *right; //Pointer to right subtree
+};
+
+void insert(Btree **root, int d)
+{
+	Btree *nn = new Btree(); //Creating new node
+	nn->data = d;
+	nn->left = NULL;
+	nn->right = NULL;
+	if (*root == NULL)
+	{
+		*root = nn;
+		return;
+	}
+	else
+	{
+		queue<Btree *> q;
+		// Adding root node to queue
+		q.push(*root);
+		while (!q.empty())
+		{
+			Btree *node = q.front();
+			// Removing parent node from queue
+			q.pop();
+			if (node->left)
+				// Adding left child of removed node to queue
+				q.push(node->left);
+			else
+			{
+				// Adding new node if no left child is present
+				node->left = nn;
+				return;
+			}
+			if (node->right)
+				// Adding right child of removed node to queue
+				q.push(node->right);
+			else
+			{
+				// Adding new node if no right child is present
+				node->right = nn;
+				return;
+			}
+		}
+	}
+}
+
+void morrisInorder(Btree *root)
+{
+	Btree *curr = root;
+	Btree *temp;
+	while (curr)
+	{
+		if (curr->left == NULL)
+		{
+			cout << curr->data << " ";
+			// If left of current node is NULL then curr is shifted to right
+			curr = curr->right;
+		}
+		else
+		{
+			// Left of current node is stored in temp
+			temp = curr->left;
+			// Moving to extreme right of temp
+			while (temp->right && temp->right != curr)
+				temp = temp->right;
+			// If extreme right is null it is made to point to currrent node (will be used for backtracking)
+			if (temp->right == NULL)
+			{
+				temp->right = curr;
+				// current node is made to point its left subtree
+				curr = curr->left;
+			}
+			// If extreme right already points to currrent node it it set to null
+			else if (temp->right == curr)
+			{
+				cout << curr->data << " ";
+				temp->right = NULL;
+				// current node is made to point its right subtree
+				curr = curr->right;
+			}
+		}
+	}
+}
+
+int main()
+{
+	// Testing morrisInorder funtion
+	Btree *root = NULL;
+	int i;
+	for (i = 1; i <= 7; i++)
+		insert(&root, i);
+	cout << "Morris Inorder: ";
+	morrisInorder(root);
+	return 0;
+}