Please see the last example in the code.

I see why he would have thought it wouldn't work for something like:

root = TreeNode(-5) root.left = TreeNode(-3)

just bc the code comment states to ignore any path with an overall negative sum it can be a little confusing.

We can still safely ignore the paths with negative sum. If the parent node is positive, the negative path sum will reduce its value. If the parent node is negative, the negative path sum will also reduce its value.

Example -

• If the parent node is 4 and -3 is returne...