class Solution(object): def isPalindrome(self, x): """ :type x: int :rtype: bool """ if x < 0: return False x=str(x) i=0 j=len(x)-1 while i < j: if x[i] != x[j]: return False i+=1 j-=1 return True…

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…

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 ext…

原题地址:https://oj.leetcode.com/problems/palindrome-partitioning/ 题意: Given a string s, partition s such that every substring of the partition is a palindrome. Return all possible palindrome partitioning of s. For example, given s = "aab",Return […

Determine whether an integer is a palindrome. Do this without extra space. 这题貌似解法挺多,直接用简单的把数倒置,没有考虑数据溢出的问题,如需解决可以把转置数设为long long即可.另外方法可以用到前后匹配.递归比较等. class Solution { public: bool isPalindrome(int x) { int a=x; ; ) return false; while(x) { n*=; n+=x…

题目: Determine whether an integer is a palindrome. Do this without extra space. 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…

原题地址:http://oj.leetcode.com/problems/valid-number/ 题意:判断输入的字符串是否是合法的数. 解题思路:这题只能用确定有穷状态自动机(DFA)来写会比较优雅.本文参考了http://blog.csdn.net/kenden23/article/details/18696083里面的内容,在此致谢! 首先这个题有9种状态: 0初始无输入或者只有space的状态1输入了数字之后的状态2前面无数字,只输入了dot的状态3输入了符号状态4前面有数字和有do…

Determine whether an integer is a palindrome. Do this without extra space. 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…

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 ext…

#question : Given an array of integers, every element appears twice except for one. Find that single one.#note : Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory? class Solution(object): def si…