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…

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…

Determine whether an integer is a palindrome. Do this without extra space. 题目标签:Math 题目给了我们一个int x, 让我们判断它是不是回文数字. 首先,负数就不是回文数字,因为有个负号. 剩下的都是正数,只要把数字 reverse 一下,和原来的比较,一样就是回文. 当有overflow 的时候,返回一个负数就可以了(因为负数肯定不会和正数相等). Java Solution: Runtime beats 61.…

Determine whether an integer is a palindrome. Do this without extra space.(不要使用额外的空间) 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…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com'https://oj.leetcode.com/problems/palindrome-number/ Determine whether an integer is a palindrome. Do this without extra space. Some hints:Could negative integers be palindromes? (ie, -1) If…

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 a…

Determine whether an integer is a palindrome. Do this without extra space. 题目意思:判断一个整数是否是回文数 例如:123211,1221即为回文数,110则不是回文数 =================================================================== 思路一: 现将这个整数反转,然后判断返转后的数是否与原来的是相等,相等则为回文数,反之则不是. 利用了上一题[Leet…

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 right to…

题目简述: 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 coul…

Determine whether an integer is a palindrome. Do this without extra space. 解题思路一: 双指针法,逐位判断 Java代码如下: static public boolean isPalindrome(int x) { if (x < 0) return false; int temp = x,beginIndex = 0, endIndex = 0; while (temp >= 10) { temp /= 10; en…

Question: 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…

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…

问题描述: 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 coul…

Problem: Determine whether an integer is a palindrome. Do this without extra space. 简单的回文数,大一肯定有要求写过,不过从基础开始尝试吧. Solution: public class Solution { public boolean isPalindrome(int x) { int n=1; int copyx=x; if(x<0)return false; if(x<10)return true; w…

题目: Determine whether an integer is a palindrome. Do this without extra space. 思路: 求一个整数是不是回文树.负数不是,0是 要求不适用额外的内存(变量还是可以的),利用求余,除以10,这样y = y×10+余树,比较y和输入值是否相等,判断是不是回文 - 代码: public class Solution { public boolean isPalindrome(int x) { if(x < 0){ retur…

题目: 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 righ…

一.题目链接:https://leetcode.com/problems/palindrome-number/ 二.题目大意: 给定一个整数,判断它是否为一个回文数.(例如-12,它就不是一个回文数:11它是一个回文数) 三.题解: 这道题目我一共用了两种解法: 方法1:将数字转化成字符串,然后首尾对应判断每个字符即可,代码如下: class Solution { public: bool isPalindrome(int x) { bool rs = true; stringstream ss…

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 right to…

Long Time No See !   题目链接https://leetcode.com/problems/palindrome-number/?tab=Description   首先确定该数字的位数.按照已知数字x对10进行多次求余运算,可以得到数字位数. 具体思路: 1.每次取出该数字的最高位和最低位进行比较. 2.如果不相等则直接返回FALSE, 3.如果相等修改x的值(去掉最高位也同时去掉最低位)其中去掉最高位可以通过求模运算,去掉最低位可以采用除以10 4.进行循环直到x的值不大于…

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. 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. 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 right to…

这道题是LeetCode里的第9道题. 题目说的: 判断一个整数是否是回文数.回文数是指正序(从左向右)和倒序(从右向左)读都是一样的整数. 示例 1: 输入: 121 输出: true 示例 2: 输入: -121 输出: false 解释: 从左向右读, 为 -121 . 从右向左读, 为 121- .因此它不是一个回文数. 示例 3: 输入: 10 输出: false 解释: 从右向左读, 为 01 .因此它不是一个回文数. 进阶: 你能不将整数转为字符串来解决这个问题吗? 这道题虽然简单…

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…

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…

判断一个 int 是否为回文的 有一点要注意的是: int x; int _x = abs(x); 对 x 取绝对值的时候,会发生溢出.比如  x = INT_MIN 即 -2147483648 而 INT_MAX 为2147483647 其实,负数不是回文数…

判断一个数是否是回文数 方法是将数回转,看回转的数和原数是否相同 class Solution { public: bool isPalindrome(int x) { ) return false; ; int n = x; ){ _x = _x * + x%; } return n == _x; } };…

题目: 判断一个数字是不是回文数字,即最高位与最低位相同,次高位与次低位相同,... 解法: 求出数字的位数,然后依次求商和求余判断是否相等. 代码: class Solution { public: bool isPalindrome(int x) { ) //负数有符号,肯定不是回文数 return false; ; ) //d与x位数相同 d *= ; while(x) { ) //比较最高位和最低位是否相等 return false; x = x % d / ; //去掉最高位和最低位…

class Solution { public: bool isPalindrome(int x) { ,init=x; ) return true; ) return false; ){ r=r*+init%; init=init/; } if(r==x) return true; else return false; } }; 题目: 判断一个整数是不是回文数,即一个数翻转过来是否跟原来的数仍一样. 需要考虑负数,负数无回文数. 解法: 翻转提供的数字,即123的话,需要翻转为321. 再判…