【LeetCode with Python】 Palindrome Number
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原题页面:https://oj.leetcode.com/problems/palindrome-number/
题目类型:
难度评价:★
本文地址:http://blog.csdn.net/nerv3x3/article/details/37335981
原题页面:https://oj.leetcode.com/problems/palindrome-number/
题目类型:
难度评价:★
本文地址:http://blog.csdn.net/nerv3x3/article/details/37335981
Determine whether an integer is a palindrome. Do this without extra space.
click to show spoilers.
Some hints:
Could negative integers be palindromes? (ie, -1)
If you are thinking of converting the integer to string, note the restriction of using extra space.
You could also try reversing an integer. However, if you have solved the problem "Reverse Integer", you know that the reversed integer might overflow. How would you handle such case?
There is a more generic way of solving this problem.
class Solution: # @return a boolean def isPalindrome(self, x): if x < 0: return False if x < 10: return True div = 1 val = x while True: val = int(val / 10) if val > 0: div *= 10 else: break while div > 0: left = int(x / div) right = int(x % 10) if left != right: return False x = x % div x = x / 10 div = int(div / 100) return True
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