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after 10086 solution in Clear category for Pearls in the Box by Little+cheng
def checkio(marbles: str, step: int) -> float:
w = marbles.count('w')
s = len(marbles)
p = w/s
while step != 1:
p = ((s*p-1)*p+(1-p)*(s*p+1))/s
step -= 1
return round(p,2)
#These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
print("Example:")
print(checkio('bbw', 3))
assert checkio('bbw', 3) == 0.48, "1st example"
assert checkio('wwb', 3) == 0.52, "2nd example"
assert checkio('www', 3) == 0.56, "3rd example"
assert checkio('bbbb', 1) == 0, "4th example"
assert checkio('wwbb', 4) == 0.5, "5th example"
assert checkio('bwbwbwb', 5) == 0.48, "6th example"
print("Coding complete? Click 'Check' to earn cool rewards!")
March 7, 2020
