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First solution in Clear category for Letter Queue by dig
from typing import List
def letter_queue(commands: List[str]) -> str:
vector = []
for instruction in commands:
if instruction.startswith('PUSH'):
vector.append(instruction[-1])
else:
if not vector:
pass
else:
vector.pop(0)
return ''.join(vector)
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!")
April 4, 2023
