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Simple and clear solution in Clear category for Letter Queue by silver659
def letter_queue(commands):
stack = []
for com in commands:
if 'PUSH' in com:
stack.append(com[-1])
if 'POP' in com and stack:
stack.pop(0)
return ''.join(stack)
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
assert letter_queue(["PUSH A", "POP", "POP", "PUSH Z", "PUSH D", "PUSH O", "POP", "PUSH T"]) == "DOT", "dot example"
assert letter_queue(["POP", "POP"]) == "", "Pop, Pop, empty"
assert letter_queue(["PUSH H", "PUSH I"]) == "HI", "Hi!"
assert letter_queue([]) == "", "Nothing"
Nov. 3, 2014
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