Disconnected Users
Find how many users wouldn't receive your email if some nodes get crushed.
Input: Four arguments. Network structure (as list of connections between nodes), users on each node (as dict where keys are node-name and values are amount of users), name of node that sends email, list of crashed nodes.
Output: Int. Amount of users that wouldn't receive an email.
Example:
disconnected_users([
['A', 'B'],
['B', 'C'],
['C', 'D']
], {
'A': 10,
'B': 20,
'C':...
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