leetcode bug & 9. Palindrome Number bug shit bug "use strict"; /** * * @author xgqfrms * @license MIT * @copyright xgqfrms * @created 2020-07-23 * @modified * * @description 9. Palindrome Number * @difficulty Easy * @complexity O(n) * @augme…

我现在在做一个叫<leetbook>的开源书项目,把解题思路都同步更新到github上了,需要的同学可以去看看 地址:https://github.com/hk029/leetcode 这个是书的地址:https://hk029.gitbooks.io/leetbook/ 009. Palindrome Number[E] 问题: Determine whether an integer is a palindrome. Do this without extra space. 思路 这里说不…

Palindrome Number time=434ms 负数不是回文数 public class Solution { public boolean isPalindrome(int x) { int palindrome=0; int revers=x; if(revers<0) return false; else{ while(revers>0){ int m=revers%10; palindrome=m+palindrome*10; revers=revers/10; } if(p…

9. Palindrome Number 题目: 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…

Palindrome Number 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 restri…

9.Palindrome Number Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1: Input: 121 Output: true Example 2: Input: -121 Output: false Explanation: From left to right, it reads…

前言   [LeetCode 题解]系列传送门:  http://www.cnblogs.com/double-win/category/573499.html   1.题目描述 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 c…

题目要求判断一个整数是不是回文数,假设输入是1234321,就返回true,输入的是123421,就返回false.题目要求in-place,思路其实很简单,在LeetCode(7)里面我们刚好做了reverse integer,我们就可以利用reverse integer得到一个reverse number,然后和输入作对比,如果与输入一致,则返回true,如果不一致,则返回false.代码如下: public class Solution { public boolean isPalindr…

一天一道LeetCode系列 (一)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…

描述: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 a…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 公众号:负雪明烛 本文关键词:回文数,回文,题解,Leetcode, 力扣,Python, C++, Java 目录 题目描述 题目大意 解题方法 判断回文字符串 翻转数字 日期 题目地址:https://leetcode.com/problems/palindrome-number/#/description 题目描述 Determine whether an integer is…

题目描述: Determine whether an integer is a palindrome. Do this without extra space. 解题分析: ^_^个人觉得这道题没有什么可分析的,直接看代码就能明白^_^. 具体代码: public class Solution { public static boolean isPalindrome(int x) { if(x<0) return false; if(x>=0&x<=9) return true;…

Problem: 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…

这是悦乐书的第144次更新,第146篇原创 今天这道题和回文有关,即从前往后和从后往前是一样的,如"上海自来水来自海上"就是一个回文字符串,如整数121就是回文数,这些都是和回文相关的. 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第3题(顺位题号是9),给定一个整数,判断其是否为回文整数,即向前读和向后读的整数一样. 输入: 121 输出: true 输入: -121 输出: false 说明:从左到右读为-121.从右到左读为121-.因此它不是回文. 输入…

@requires_authorization @author johnsondu @create_time 2015.7.13 9:48 @url [palindrome-number](https://leetcode.com/problems/palindrome-number/) /************************ * 分离出最左边和最右边的数 * 然后依次对照就可以 ***********************/ class Solution { public: bo…

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…

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…

题目如图,下面是我的解决方法: class Solution { public boolean isPalindrome(int x) { if(x < 0) //由题意可知,小于0的数不可能为回数, 因此直接返回false 4 return false; else { String len = x + ""; int[] arr = new int[len.length()]; //创建数组arr, 长度为x的位数 int result = 0; int q = x; for(…

题目描述 Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1: Input: 121 Output: true Example 2: Input: -121 Output: false Explanation: From left to right, it reads -121. From rig…

public class Solution { public int reverse(int x) { int ret=0; while(x!=0) { int t=x%10; ret=ret*10+t; x=x/10; } return ret; }} public class Solution { public boolean isPalindrome(int x) { if(x<0) return false; if(x==0) return true; int ret=0; int xo…

题目大意: 判断输入的数字是不是回文数.所谓回文数就是正反读都一样的数字,比如说11,121,1221这样子的数字.负数不会是回文数. 解题思路: 思路一:如果这个数是负数,则返回false,否则用一个变量记录这个数字你转后的数字,判断它和逆转前是否相等. 思路二:如果是负数或者这个数个位为0,则返回false(0除外,如果是0也返回true).否则用一个数字记录它逆转的一半,与其另一半比较,查看是否相等.(考虑数字位数的奇偶性) 解决代码: 我只写了思路二的代码,因为相对思路二的效率比思路一高…

这题要求不能使用额外的空间,我也就没做,看了下别人的代码,挺有意义的一道题目,出坏了. 解题思路:从右往左颠倒过来,看看这个值和原来的x值是不是一样,最后还要注意像20这种情况,也是的 public boolean isPalindrome(int x) { if (x<0 || (x!=0 && x%10==0)) return false; int rev = 0; while (x>rev){ rev = rev*10 + x%10; x = x/10; } return…

目录 题目链接 注意点 解法 小结 题目链接 Palindrome Number - LeetCode 注意点 负数肯定是要return false的 数字的位数要分奇数和偶数两种情况 解法 解法一:将数字转化为字符串,然后对字符串从中间开始往两边拓展比较,要分长度为奇数和偶数的情况.时间复杂度为O(n) class Solution { public: bool isPalindrome(int x) { if(x<0 || (x%10 == 0 && x!=0)) { retur…

9 - Palindrome Number 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…

Reverse Integer Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 click to show spoilers. Have you thought about this? Here are some good questions to ask before coding. Bonus points for you if you have alread…

9. Palindrome Number Question: Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1: Input: 121 Output: true Example 2: Input: -121 Output: false Explanation: From left to righ…

9. Palindrome Number Easy Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1: Input: 121 Output: true Example 2: Input: -121 Output: false Explanation: From left to right, it…

9. Palindrome Number 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 res…

1.题目 9. Palindrome Number   Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1: Input: 121 Output: true Example 2: Input: -121 Output: false Explanation: From left to right,…

---不包含jiuzhang ladders中出现过的题.如出现多个方法,则最后一个方法是最优解. 目录: 1 String 2 Two pointers 3 Array 4 DFS && BFS 5 Math 6 Dynamic Programming 7 Data Structure 8 Binary Search 9 Tree 10 Bit Manipulation 11 Linked List 12 graph 1 String 1.1  Longest Palindromic S…