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First solution in Clear category for New Cities by bravebug
def subnetworks(net, crushes):
connected = set()
connections = 0
for a, b in net:
connected = connected | {a, b} - set(crushes)
if a not in crushes and b not in crushes:
connections += 1
return len(connected) - connections
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
assert subnetworks([
['A', 'B'],
['B', 'C'],
['C', 'D']
], ['B']) == 2, "First"
assert subnetworks([
['A', 'B'],
['A', 'C'],
['A', 'D'],
['D', 'F']
], ['A']) == 3, "Second"
assert subnetworks([
['A', 'B'],
['B', 'C'],
['C', 'D']
], ['C', 'D']) == 1, "Third"
print('Done! Check button is waiting for you!')
June 29, 2020
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