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Last active October 23, 2015 16:05
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mystery.py
lambda inp: sum( [v - 2 * sv for (sv, v) in [
(pv if pv < v else 0, v) for (pv, v) in [
(values[pc] if pc else 0, values[c]) for (pc, c) in
zip([None] + list(inp), inp) ]]] )
# "values" dict omitted because it'd be a bit of a giveaway
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