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""" The Weekly Challenge 133 Task 1 """
def get_square_root(what: int, low: int = 0, high: int = 0):
""" Calculate the square root using interval halving"""
if not high:
high = what
middle = int((high + low) / 2)
incr_middle = middle + 1
if middle * middle <= what <= incr_middle * incr_middle:
return middle
if middle * middle > what:
middle = get_square_root(what, low, middle)
else:
middle = get_square_root(what, middle, high)
return middle
assert get_square_root(10) == 3
assert get_square_root(27) == 5
assert get_square_root(85) == 9
assert get_square_root(101) == 10
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