题解 | #求解立方根#
求解立方根
https://www.nowcoder.com/practice/caf35ae421194a1090c22fe223357dca
def bina(y, m, n):
x = (m+n)/2
cmp = x**3
if abs(y - cmp) <= espi:
ret = x
elif y - cmp > espi:
ret = bina(y, x, n)
else:
ret = bina(y, m, x)
return ret
n = float(input())
espi = 1e-3
right = max(n, 1)
left = min(n, -1)
x = bina(n, left ,right)
print("{:.1f}".format(x))
