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Cases one-by-one solution in Clear category for Lightbulb End Watching by sawako.oono
from datetime import datetime
from typing import List, Optional
def sum_light(els: List[datetime], start_watching: Optional[datetime] = None, end_watching: Optional[datetime] = None) -> int:
"""
how long the light bulb has been turned on
"""
sw = start_watching
ew = end_watching
gap = 0
if sw == None:
sw = min(els)
if ew == None:
ew = max(els)
for i in range(len(els)):
if i%2 !=0: #except for the even row at the end
if els[i-1]<=sw:
if els[i]<=sw:#span before sw
gap += 0
elif sw<= els[i]<=ew:#sw in the middle of the span and ew after
gap += (els[i]-sw).total_seconds()
elif ew<=els[i]:#sw and ew in the middle of the span
gap += (ew-sw).total_seconds()
elif sw<=els[i-1]<=ew:
if els[i]<=ew:#whole span between sw and ew
gap += (els[i]-els[i-1]).total_seconds()
elif ew<=els[i]:#sw befor the span and ew in the middle
gap += (ew-els[i-1]).total_seconds()
elif ew<=els[i-1]:#whole span after ew
gap += 0
elif i%2 ==0 and i==len(els)-1:#for the last row of odd number of rows
if els[i]<=sw:#if the last switch-on is before sw
gap += (ew-sw).total_seconds()
elif sw<=els[i]<=ew: #if the last switch-on is between sw and ew
gap += (ew-els[i]).total_seconds()
else:#if the last switch-on is after ew
gap += 0
return gap
if __name__ == '__main__':
print("Example:")
print(sum_light([
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 0, 10),
],
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 0, 10)))
assert sum_light(els=[
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 0, 10),
],
start_watching=datetime(2015, 1, 12, 10, 0, 0),
end_watching=datetime(2015, 1, 12, 10, 0, 10)) == 10
assert sum_light([
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 0, 10),
],
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 0, 7)) == 7
assert sum_light([
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 0, 10),
],
datetime(2015, 1, 12, 10, 0, 3),
datetime(2015, 1, 12, 10, 0, 10)) == 7
assert sum_light([
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 0, 10),
],
datetime(2015, 1, 12, 10, 0, 10),
datetime(2015, 1, 12, 10, 0, 20)) == 0
assert sum_light([
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 10, 10),
datetime(2015, 1, 12, 11, 0, 0),
datetime(2015, 1, 12, 11, 10, 10),
],
datetime(2015, 1, 12, 10, 30, 0),
datetime(2015, 1, 12, 11, 0, 0)) == 0
assert sum_light([
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 10, 10),
datetime(2015, 1, 12, 11, 0, 0),
datetime(2015, 1, 12, 11, 10, 10),
],
datetime(2015, 1, 12, 10, 10, 0),
datetime(2015, 1, 12, 11, 0, 0)) == 10
assert sum_light([
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 10, 10),
datetime(2015, 1, 12, 11, 0, 0),
datetime(2015, 1, 12, 11, 10, 10),
],
datetime(2015, 1, 12, 10, 10, 0),
datetime(2015, 1, 12, 11, 0, 10)) == 20
assert sum_light([
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 10, 10),
datetime(2015, 1, 12, 11, 0, 0),
datetime(2015, 1, 12, 11, 10, 10),
],
datetime(2015, 1, 12, 9, 50, 0),
datetime(2015, 1, 12, 10, 0, 10)) == 10
assert sum_light([
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 10, 10),
datetime(2015, 1, 12, 11, 0, 0),
datetime(2015, 1, 12, 11, 10, 10),
],
datetime(2015, 1, 12, 9, 0, 0),
datetime(2015, 1, 12, 10, 5, 0)) == 300
assert sum_light([
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 10, 10),
datetime(2015, 1, 12, 11, 0, 0),
datetime(2015, 1, 12, 11, 10, 10),
],
datetime(2015, 1, 12, 11, 5, 0),
datetime(2015, 1, 12, 12, 0, 0)) == 310
assert sum_light([
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 10, 10),
datetime(2015, 1, 12, 11, 0, 0),
],
datetime(2015, 1, 12, 11, 5, 0),
datetime(2015, 1, 12, 11, 10, 0)) == 300
assert sum_light([
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 10, 10),
datetime(2015, 1, 12, 11, 0, 0),
],
datetime(2015, 1, 12, 10, 10, 0),
datetime(2015, 1, 12, 11, 0, 10)) == 20
assert sum_light([
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 10, 10),
datetime(2015, 1, 12, 11, 0, 0),
],
datetime(2015, 1, 12, 9, 10, 0),
datetime(2015, 1, 12, 10, 20, 20)) == 610
assert sum_light([
datetime(2015, 1, 12, 10, 0, 0),
],
datetime(2015, 1, 12, 9, 10, 0),
datetime(2015, 1, 12, 10, 20, 20)) == 1220
assert sum_light([
datetime(2015, 1, 12, 10, 0, 0),
],
datetime(2015, 1, 12, 9, 9, 0),
datetime(2015, 1, 12, 10, 0, 0)) == 0
assert sum_light([
datetime(2015, 1, 12, 10, 0, 0),
],
datetime(2015, 1, 12, 9, 9, 0),
datetime(2015, 1, 12, 10, 0, 10)) == 10
print("The third mission in series is completed? Click 'Check' to earn cool rewards!")
May 20, 2021
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