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First solution in Clear category for Brackets by wildguyss
def checkio(expression):
brackets = "{}()[]"
stack = []
for m in expression:
if brackets.find(m) > -1:
if stack and stack[-1] == brackets[brackets.find(m)-1]: stack.pop()
else: stack.append(m)
return not stack
#These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
assert checkio("((5+3)*2+1)") == True, "Simple"
assert checkio("{[(3+1)+2]+}") == True, "Different types"
assert checkio("(3+{1-1)}") == False, ") is alone inside {}"
assert checkio("[1+1]+(2*2)-{3/3}") == True, "Different operators"
assert checkio("(({[(((1)-2)+3)-3]/3}-3)") == False, "One is redundant"
assert checkio("2+3") == True, "No brackets, no problem"
Oct. 6, 2019
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