This is a good question to ask during an interview. For the purpose of this problem, we define empty string as valid palindrome. 思路: easy. AC代码: 1classSolution {2public:3boolisPalindrome(strings) {4inta=0,b=s.
LeetCode 125题的解题思路是什么? 如何忽略字符串中的非字母数字字符来判断回文? 题目描述: 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. Example 1: 代...
Usetwo pointers, one points to head (walk toward tail), another points to tail(walk toward head), if two characters are different, then return false. Be careful: There are no different between a lower case letter and its upper case in this problem. 回到顶部 Solution With the help of API...
// Solution 1: This problem can be quite challenging if it's your first attempt. I didn't work it out after almost two hour, so I referred to this solution from the internet. Very clever and efficient. 代码1 // Code 1 117 Populating Next Right Pointers in Each Node II // #117 填...
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给你一个二叉树的根节点root, 检查它是否轴对称。 示例1: 输入:root = [1,2,2,3,4,4,3]输出:true 示例2: 输入:root = [1,2,2,null,3,null,3]输出:false 提示: 树中节点数目在范围[1, 1000]内 -100 <= Node.val <= 100 进阶:你可以运用递归和迭代两种方法解决这个问题吗?
53. 最大子数组和 - 给你一个整数数组 nums ,请你找出一个具有最大和的连续子数组(子数组最少包含一个元素),返回其最大和。 子数组 是数组中的一个连续部分。 示例 1: 输入:nums = [-2,1,-3,4,-1,2,1,-5,4] 输出:6 解释:连续子数组 [4,-1,2,1] 的和最大,为
72. 编辑距离 - 给你两个单词 word1 和 word2, 请返回将 word1 转换成 word2 所使用的最少操作数 。 你可以对一个单词进行如下三种操作: * 插入一个字符 * 删除一个字符 * 替换一个字符 示例 1: 输入:word1 = "horse", word2 = "ros" 输出:3 解释: horse
第二是problem solving,要展示自己的解决问题的策略。比如选数据结构什么的,一定要讲明白为什么要用各种算法和数据结构。 第三是coding。在前面两步的基础上,写出来干净正确的代码。 第四是testing,一定要回去验证自己的代码。这个过程中可以分析一下代码的复杂度。 怎么去练以上的步骤,有详细过程解析的入门教程就能...
363. Max Sum of Rectangle No Larger Than K 365. Water and Jug Problem 367. Valid Perfect Square 368. Largest Divisible Subset 37. Sudoku Solver 371. Sum of Two Integers 372. Super Pow 373. Find K Pairs with Smallest Sums ...