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First solution in Clear category for Digits Doublets by brownie57
from collections import deque
def checkio(numbers):
start, goal = numbers.pop(0), numbers[-1]
queue = deque([[start]])
while queue:
seq = queue.popleft()
for n in numbers:
if n in seq:
continue
if sum([1 for i in range(3) if str(seq[-1])[i] != str(n)[i]]) == 1:
if n == goal:
return seq + [n]
queue.append(seq + [n])
#These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
assert checkio([123, 991, 323, 321, 329, 121, 921, 125, 999]) == [123, 121, 921, 991, 999], "First"
assert checkio([111, 222, 333, 444, 555, 666, 121, 727, 127, 777]) == [111, 121, 127, 727, 777], "Second"
assert checkio([456, 455, 454, 356, 656, 654]) == [456, 454, 654], "Third, [456, 656, 654] is correct too"
Jan. 10, 2019
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