题解 | #求解立方根#
求解立方根
https://www.nowcoder.com/practice/caf35ae421194a1090c22fe223357dca
a=float(input())
b=1
if a<0:
b=-1
a=a*b
for i in range(20):
if i*i*i<=a and a<(i+1)*(i+1)*(i+1):
break
for n in range(1000):
if (n*0.001+i)*(n*0.001+i)*(n*0.001+i)<=a and ((n+1)*0.001+i)*((n+1)*0.001+i)*((n+1)*0.001+i)>a:
res=n*0.001+i
#print(res)
if b==1:
print(round(res,1))
else:
print(round(res*-1,1))
