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import re
from typing import Optional
import math
def format(minutes: int):
if minutes >= 60 * 24:
return '' + str(math.floor(minutes / 60 / 24)) + 'd'
elif minutes >= 60:
return '' + str(math.floor(minutes / 60)) + 'h'
elif minutes > 0:
return '' + str(minutes) + 'm'
else:
return ''
def parse(duration: str) -> Optional[int]:
duration = duration.strip()
if duration:
result = re.match('^(\d+)([mhd])$', duration.strip())
if result:
n = int(result.group(1))
unit = result.group(2)
if unit == 'm':
return n
elif unit == 'h':
return n * 60
elif unit == 'd':
return n * 60 * 24
else:
return None
else:
return 0
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