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hello friends and welcome to another tutorial on geeks for geeks in this video we are going to understand the program which modifies a binary tree to get preorder traversal using right pointers only first let us take an example this can be easily done using iterative preorder traversal the idea is to maintain a variable proof which maintains the previous node of the pre-order traversal every time a new node is encountered the node set its tight to previous one and trim is made equal to the current node in the end we will have a sort of linked list whose first element is root then left child then right so on and so forth now let us have a look at the algorithm let us also have a sample tree to test our algorithm we passed the root node which is 10 to modify tree function so root points to 10 since root is not null we create a stack and push the root node into the stack next we take a node free which we said to null initially since stack is not empty we enter the while loop and now insid
