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Determine whether an integer is a palindrome. Do this without extra space.题意：判断一个数是不是回文数。 通常情况下，我们可以把这个数转化为一个字符串，然后反转，判断相等。但题目要求不能使用额外空间，所以，抛弃。我的想法是循环将数字反转，比较。public class Solution { public boolea

Given an array of integers, return indices of the two numbers such that they add up to a specific target.You may assume that each input would have exactly one solution, and you may not use the same ele

Reverse digits of an integer.Example1: x = 123, return 321 Example2: x = -123, return -321Note: The input is assumed to be a 32-bit signed integer. Your function should return 0 when the reversed int