Share my python solution with explanation.

  • 4
    class Solution:
        # @param root, a tree node
        # @return an integer
        def minDepth(self, root):
            if not root:
                return 0
                # if one of the subtree is None, you should return the depth of another subtree.
                # if all of the subtree is not None, you should return the minimum depth of the two subtrees
                if root.left is None:
                    return self.minDepth(root.right) + 1
                elif root.right is None:
                    return self.minDepth(root.left) + 1
                    return min(self.minDepth(root.left), self.minDepth(root.right)) + 1

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