求立方根
求解立方根
http://www.nowcoder.com/questionTerminal/caf35ae421194a1090c22fe223357dca
import sys
num = float(sys.stdin.readline().strip())
start = 0
end = num
mid = (end+start)/2
while abs(mid**3-num) > 0.001:
if mid**3 > num:
end = mid
mid = (end+start)/2
else:
start = mid
mid = (end+start)/2
print(round(mid, ndigits=1)) 
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