(即先从左往右,再从右往左进行下一层遍历,以此类推,层与层之间交替进行)。 例如: 给定二叉树 [3,9,20,null,null,15,7], 3 / \ 9 20 / \ 15 7 返回锯齿形层序遍历如下: [ [3], [20,9], [15,7] ] 题源:https://leetcode-cn.com/problems/binary-tree-zigzag-level-order-traversal/ 代...
// // // //示例 1: // //输入: s = "abcdefg", k = 2 //输出: "cdefgab" //示例 2: // //输入: s = "lrloseumgh", k = 6 //输出: "umghlrlose" // // //限制: // //1 <= k < s.length <= 10000 //https://leetcode-cn.com/problems/zuo-xuan-zhuan-zi-fu-chuan...
0094-Binary-Tree-Inorder-Traversal 0102-Binary-Tree-Level-Order-Traversal 0144-Binary-Tree-Preorder-Traversal 0145-Binary-Tree-Postorder-Traversal 0150-Evaluate-Reverse-Polish-Notation 0167-Two-Sum-II-Input-array-is-sorted 0203-Remove-Linked-List-Elements 0219-Contains-Duplicate-II 0237-Delete-Node-...
packageleetcodeimport"strings"funcreverseWords151(sstring)string{ss:=strings.Fields(s)reverse151(&ss,0,len(ss)-1)returnstrings.Join(ss," ")}funcreverse151(m*[]string,iint,jint){fori<=j{(*m)[i],(*m)[j]=(*m)[j],(*m)[i]i++j--}}...
leetcode---Reverse Integer Reverse digits of an integer. Example1: x = 123, return 321 Example2: 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 already thought through this...
LeetCode-Reverse Integer Description: Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: 123 Output: 321 Example 2: Input: -123 Output: -321 重点内容 Example 3: Input: 120 Output: 21 Note: Assume we are dealing with an environment which could only store ...
Leetcode#150 Evaluate Reverse Polish Notation 原题地址 基本栈操作。 注意数字有可能是负的。 代码: 1inttoInteger(string&s) {2intres =0;3boolnegative = s[0] =='-'?true:false;45for(inti = negative ?1:0; i < s.length(); i++) {6res *=10;7res += s[i] -'0';8}9return...
Reverse Words in a String II -- LeetCode Given an input string, reverse the string word by word. A word is defined as a sequence of non-space characters. The input string does not contain leading or trailing spaces and the words are always separated by a single space....
Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321 Have you thought about this? Here are some good questions to ask before coding. Bonus points for you if you have already thought through this!
1 public class Solution { 2 public ListNode reverseBetween(ListNode head, int m, int n) { 3 // IMPORTANT: Please reset any member data you declared, a