一次AC

题目要求中有空间限制,因此没有采用字符串由量变向中间逐个对比的方法,而是采用计算翻转之后的数字与x是否相等的方法;

 class Solution:
# @return a boolean
def isPalindrome(self, x):
o = x
ret = 0
flag = 1
if x < 0:
return False
while(x!=0):
ret = ret*10+x%10
x = x/10
return ret == o

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