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ReverseInteger.py

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# Given a 32-bit signed integer, reverse digits of an integer.

# Input: 123

# Output: 321

# Input: -123

# Output: -321

# Input: 120

# Output: 21

# Input: 1534236469

# Output: 0

# range: [−231, 231 − 1].

def reverse(x):

"""

:type x: int

:rtype: int

"""

arr = list(str(x))

if arr[0] == '-':

arr.remove('-')

arr.append('-')

reversedValue = ""

for _ in range(len(arr)):

reversedValue += arr.pop()

out = int(reversedValue)

if out < -2**31 or out > 2**31 -1:

out = 0

return out

arrout = reverse(1534236469)

print(arrout) # 0

#------------------------------------------

class Solution2(object):

def reverse(self, x):

"""

:type x: int

:rtype: int

"""

list_=list(str(x))

i=0

j=len(list_)-1

while i<j :

if list_[i]=="-":

i+=1

temp=list_[i]

list_[i]=list_[j]

list_[j]=temp

i+=1

j-=1

req_num=int ("".join(list_))

max_= 2**31 - 1

min_=-1 * 2**31

if ((req_num > max_) or (req_num < min_)):

return 0

return req_num