APRIL LONG CHALLENGE 2019 [SUBREM] - Clarification

Can anybody explain the test case how is the output is -4? It seems correct answer would be -14 if we do not do any remove operation (k=0). I posted my doubt on the actual problem page but its almost 3 days no reply from Admin. This is something not expected for active challenge.

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if we remove the 2nd node then 3rd node will be deleted(as it is in its subtree).
so the node left is only 1st node.
so answer is


tree is like


having wt as 1, -5, -10 respectively

if 2nd node is removed then profit is

(sum of remaining nodes) - (X)(k) = (1) - (5)*(1) = -4

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I see. Sorry for the confusion. I was removing just a single node. My bad. Thanks.

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I understand your concern but I posted the comment 3 days back in the actual comment section of the problem but did not get any response. That is why I posted it here.

yeah no one replies there
i know they can’t ans all of them but they are answering none