Enable Javascript in your browser and then refresh this page, for a much enhanced experience.
First solution in Clear category for Letter Queue by drill3r92
from typing import List
def letter_queue(commands: List[str]) -> str:
stack = ''
for elem in commands:
if 'PUSH' in elem:
stack += elem[-1]
else:
stack = stack[1:]
return stack
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. 7, 2021