
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': 30, 'D': 40 }, 'A', ['C']) == 70 disconnected_users([ ['A', 'B'], ['B', 'D'], ['A', 'C'], ['C', 'D'] ], { 'A': 10, 'B': 0, 'C': 0, 'D': 40 }, 'A', ['B']) == 0 disconnected_users([ ['A', 'B'], ['A', 'C'], ['A', 'D'], ['A', 'E'], ['A', 'F'] ], { 'A': 10, 'B': 10, 'C': 10, 'D': 10, 'E': 10, 'F': 10 }, 'C', ['A']) == 50