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a guest Dec 11th, 2019 85 Never
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  1. class Station:
  2.     def __init__(self, dist_from_a, cost, distancePerOneLitter):
  3.         self.gaz_count = dist_from_a / distance_for_one_liter
  4.         self.cost = cost
  5.  
  6.     def __str__(self):
  7.         return "(" + str(self.gaz_count) + " " + str(self.cost) + ")"
  8.  
  9.  
  10. def get_cost(cost_str):
  11.     a, b = cost_str.split('.')
  12.     b = int(b)
  13.     if b < 10:
  14.         b *= 10
  15.  
  16.     return int(a) * 100 + b
  17.  
  18.  
  19. if __name__ == "__main__":
  20.     distance = int(input())
  21.  
  22.     nums = input().split(" ")
  23.     capacity = int(nums[0])
  24.     distance_for_one_liter = int(nums[1])
  25.     money_spend_in_A = get_cost(nums[2])
  26.     stations_count = int(nums[3])
  27.  
  28.     stations = []
  29.     stations.append(Station(0, 0, distance_for_one_liter))
  30.     for i in range(stations_count):
  31.         nums = input().split(" ")
  32.         dist_from_a = int(nums[0])
  33.         cost = get_cost(nums[1])
  34.         stations.append(Station(dist_from_a, cost, distance_for_one_liter))
  35.  
  36.     d = []
  37.     d.append(0)
  38.     for i in range(1, len(stations)):
  39.         costs = []
  40.         all_costs = []
  41.         for j in range(len(d)):
  42.             if float(capacity) / 2 - 0.001 <= stations[i].gaz_count - stations[j].gaz_count <= capacity + 0.001:
  43.                 costs.append(d[j] + 2000 + (stations[i].gaz_count - stations[j].gaz_count) * stations[i].cost)
  44.             if stations[i].gaz_count - stations[j].gaz_count <= capacity + 0.001:
  45.                 all_costs.append(d[j] + 2000 + (stations[i].gaz_count - stations[j].gaz_count) * stations[i].cost)
  46.         if len(costs) > 0:
  47.             d.append(sorted(costs)[0])
  48.         else:
  49.             d.append(sorted(all_costs)[0])
  50.  
  51.     gaz_to_end = distance / distance_for_one_liter
  52.  
  53.  
  54.     station_ids_to_go_to_end = []
  55.     for stationId in range(len(stations)):
  56.         if stations[stationId].gaz_count > gaz_to_end - capacity - 0.0001:
  57.             station_ids_to_go_to_end.append(stationId)
  58.  
  59.     costs_to_end = []
  60.     for station_to_end_id in station_ids_to_go_to_end:
  61.         costs_to_end.append(d[station_to_end_id])
  62.  
  63.     intValue = str(int(sorted(costs_to_end)[0] + money_spend_in_A))
  64.     print(intValue[:-2], ".", intValue[-2:], sep="")
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