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australian_voting.py
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australian_voting.py
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"""1.6.8 Australian Voting"""
import itertools
from operator import itemgetter
cases = int(input())
_ = input()
for case in range(0, cases):
n = int(input())
all_candidates = [input() for _ in range(0, n)]
candidates = set(range(0, n))
ballot = []
while True:
try:
line = input()
if not line:
break
else:
ballot.append([int(v) - 1 for v in line.split(maxsplit=n - 1)])
except (EOFError, ValueError):
break
while True:
counted_votes = sorted(
((candidate, len(list(votes)))
for candidate, votes
in itertools.groupby(sorted(b[0] for b in ballot))),
key=itemgetter(1),
reverse=True)
_, strongest_vote = counted_votes[0]
if all(vote == strongest_vote for _, vote in counted_votes):
if case > 0:
print()
for candidate, _ in counted_votes:
print(all_candidates[candidate])
break
elif len(counted_votes) < len(candidates):
voted_for = {candidate for candidate, _ in counted_votes}
for candidate in candidates - voted_for:
for b in ballot:
b.remove(candidate)
candidates = voted_for
else:
_, weakest_vote = counted_votes[-1]
while counted_votes[-1][1] == weakest_vote:
eliminated, _ = counted_votes.pop()
candidates.remove(eliminated)
for b in ballot:
b.remove(eliminated)