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array of lamps and array of event solution in Clear category for Multiple Lightbulbs by kdim
from datetime import datetime
from typing import List, Optional, Union, Tuple
def sum_light(els: List[Union[datetime, Tuple[datetime, int]]], start_watching: Optional[datetime] = None, end_watching: Optional[datetime] = None) -> int:
els = [list(els[i]) if type(els[i]) == tuple else [els[i], 1] for i in range(len(els))] # normalization of els
start = start_watching if start_watching else els[0][0]
end = end_watching if end_watching else els[-1][0]
light = [ # array with event and True/False if light On/Off
[datetime(1970, 1, 1, 0, 0, 0), False], # initially the light was off ;-)
[datetime(9999, 12, 31, 23, 59, 59), False], # in future the light was off too ;-)
[start, None], # None for Start and End
[end, None] #
]
lamps = [False] * max(els, key=lambda x: x[1])[1] # array of lamps
for i, d in enumerate(els):
lamps[d[1]-1] = not lamps[d[1]-1] # push button
light += [[d[0], any(lamps)]] # add event and True for light On
light = sorted(light, key=lambda x: x[0]) # sorted for time
for i, d in enumerate(light): # replace None with the values that were before
if d[1] == None: light[i][1] = light[i - 1][1] #
light = dict(light) # remove duplicates event
light = list(filter(lambda x: start <= x[0] <= end, light.items())) # filter event between start and stop
delta = [(light[i][0] - light[i - 1][0]).total_seconds() for i in range(1, len(light)) if light[i - 1][1]] # sum if before was True (light On)
return sum(delta)
Jan. 17, 2021
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