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#!/bin/env python3
# cost should be given in cents
def tanken(drives, cost):
passengers = {}
distance = 0.
drives = [d.split(' ') for d in drives]
for d in drives:
try:
d[0] = int(d[0])
except:
return None, "Lines have to start with the driven distance!"
# calculate overall distance
distance += d[0]
# collect distances per passenger
for p in d[1:]:
if p not in passengers:
passengers[p] = [d[0],0]
else:
passengers[p][0] += d[0]
# calculate cost per kilometer
if distance <= 0:
return None, "Driven distance must be greater than 0!"
c = cost/distance
for d in drives:
# calculate cost per drive split through passengers
c_d = int(c * d[0] / (len(d) - 1))
for p in d[1:]:
passengers[p][1] += c_d
return passengers, None
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