leetcode.cn/problems/Xl 解题思路 先全部转小写字母(题目要求忽略大小写)然后先去除除了字母和数字的字符,首尾依次比较 解题方法 俺这版 class Solution { public static boolean isPalindrome(String s) { String s1 = s.toLowerCase().replaceAll("[^a-z|0-9]", ""); int length = s1.length(); fo...
*/publicstaticbooleanvalindPalindrome4(Stringstr){//初始化头指针和尾指针int head =0; int tail =str.length() -1;//循环遍历比较while(head < tail){//取出首指针对应的值charcHead =str.charAt(head);//取出尾指针对应的值charcTail =str.charAt(tail);//如果c1不是字母或数字,则p++之后进入下一...
然后就是从两头开始判断,只要是不相等就返回false,如果不用先有的函数,那么实现一个判断是否为字母数字的函数和一个大小写转换的函数即可,直接看代码: 1publicclassSolution {2publicbooleanisPalindrome(String s) {3intlen=s.replaceAll("[^a-zA-Z0-9]","").length();4String tmp=s.replaceAll("[^a-zA...
class Solution: def validPalindrome(self, s: str) -> bool: # 定义左指针 l ,初始化为 0 l: int = 0 # 定义右指针 r ,初始化为 s.length - 1 r: int = len(s) - 1 # 当还有字符需要比较时,继续处理 while l < r: # 如果 s[l] 和 s[r] 不相等,则需要删除字符 if s[l] != ...
For the purpose of this problem, we define empty string as valid palindrome. 这道题考查的是指定字符的回文数字的判断。 建议和leetcode 680. Valid Palindrome II 去除一个字符的回文字符串判断 + 双指针 一起学习 代码如下: public class Solution ...
LeetCode-Valid Palindrome II Description: Given a non-empty string s, you may delete at most one character. Judge whether you can make it a palindrome. Example 1: AI检测代码解析 Input: "aba" Output: True 1. 2. Example 2: AI检测代码解析...
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LeetCode 125:Valid Palindrome(有效回文) Q:Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. Note: For the purpose of this problem, we define empty string as valid palindrome.
1. Valid PalindromeII Given a strings, returntrueif thescan be palindrome after deletingat most onecharacter from it. Example 1: Input: s = "aba" Output: true Example 2: Input:s="abca"Output:trueExplanation:You coulddeletethe character'c'. ...
Can you solve this real interview question? Valid Palindrome - A phrase is a palindrome if, after converting all uppercase letters into lowercase letters and removing all non-alphanumeric characters, it reads the same forward and backward. Alphanumeric c