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First solution in Clear category for Letter Queue by wo.tomasz
from typing import List
def letter_queue(commands: List[str]) -> str:
output = []
for command in commands:
pc = command.split(' ')
if pc[0] == 'POP':
if len(output) > 0:
output.pop(0)
else:
output.append(pc[1])
return ''.join(output)
if __name__ == '__main__':
print("Example:")
print(letter_queue(['PUSH A',
'POP',
'POP',
'PUSH Z',
'PUSH D',
'PUSH O',
'POP',
'PUSH T']))
# These "asserts" are used for self-checking and not for an auto-testing
assert letter_queue(['PUSH A',
'POP',
'POP',
'PUSH Z',
'PUSH D',
'PUSH O',
'POP',
'PUSH T']) == 'DOT'
assert letter_queue(['POP', 'POP']) == ''
assert letter_queue(['PUSH H', 'PUSH I']) == 'HI'
assert letter_queue([]) == ''
print("Coding complete? Click 'Check' to earn cool rewards!")
Jan. 27, 2021
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