Q3: Cumulative Sum Write a function cumulative_sum that mutates the Tree t so that each node's label becomes the sum of all labels in the subtree rooted at the node. def cumulative_sum(t): "" "Mutates t so that each node's label becomes the sum of all labels in the corresponding subtree rooted at t. >>> t = Tree (1, [Tree(3, [Tree(5)]), Tree(7)]) >>> cumulative_sum(t) >>> t Tree (16, [Tree(8, [Tree (5)]), Tree (7)])

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In Python

Q3: Cumulative Sum
Write a function cumulative_sum that mutates the Tree t so that each node's label
becomes the sum of all labels in the subtree rooted at the node.
def cumulative_sum(t):
"" "Mutates t so that each node's label becomes the sum of
all labels in the corresponding subtree rooted at t.
>>> t = Tree (1, [Tree(3, [Tree(5)]), Tree(7)])
>>> cumulative_sum(t)
>>> t
Tree (16, [Tree(8, [Tree (5)]), Tree (7)])
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Q3: Cumulative Sum Write a function cumulative_sum that mutates the Tree t so that each node's label becomes the sum of all labels in the subtree rooted at the node. def cumulative_sum(t): "" "Mutates t so that each node's label becomes the sum of all labels in the corresponding subtree rooted at t. >>> t = Tree (1, [Tree(3, [Tree(5)]), Tree(7)]) >>> cumulative_sum(t) >>> t Tree (16, [Tree(8, [Tree (5)]), Tree (7)])

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