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First solution in Uncategorized category for How to Find Friends by tanya
def check_connection(network, first, second):
links ={}
for t in network:
(a,b) = t.split('-', 1)
if b not in links.get(a, []):
m = links.get(a, set()) | links.get(b, set()) | set([a]) | set([b])
for i in m:
links[i] = m
return first in links[second]
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
assert check_connection(
("dr101-mr99", "mr99-out00", "dr101-out00", "scout1-scout2",
"scout3-scout1", "scout1-scout4", "scout4-sscout", "sscout-super"),
"scout2", "scout3") == True, "Scout Brotherhood"
assert check_connection(
("dr101-mr99", "mr99-out00", "dr101-out00", "scout1-scout2",
"scout3-scout1", "scout1-scout4", "scout4-sscout", "sscout-super"),
"super", "scout2") == True, "Super Scout"
assert check_connection(
("dr101-mr99", "mr99-out00", "dr101-out00", "scout1-scout2",
"scout3-scout1", "scout1-scout4", "scout4-sscout", "sscout-super"),
"dr101", "sscout") == False, "I don't know any scouts."
Dec. 13, 2014
