Binary Trees question. Checking for similar shape

Question

Hi I\'m stuck doing this, not sure how to go about it.

If I have two binary trees, how would I check if the have the same shape? Data in the nodes doesn\'t matter, j

Answer 1

Just follow the branches, mimicking each move in one tree in the other. In Python pseudo-code:

class Tree:
    def __init__(self, value, left=None, right=None):
        self.value = value
        self.left = left
        self.right = right

def same_shape(T1, T2):
    if T1 == None:
        return T2 == None

    if T2 == None:
        return T1 == None

    return same_shape(T1.left, T2.left) and same_shape(T1.right, T2.right)