classSolution{publicListNodereverseList(ListNode head){ListNodepre=null, temp =null;while(head !=null){ temp = head.next; head.next = pre; pre = head; head = temp;}re
LeetCode 206:反转链表 【题意】 给出单链表的头节点 head,反转链表,返回反转后的链表。 【示例】 输入:head = [1, 2, 3, 4, 5] 输出:[5, 4, 3, 2, 1] 注意,如果是空链表 输入:head = [] 输出:[] 【提示】 0 <= 链表节点数 <= 5000 -5000 <= Node.val <= 5000 【题目解析】 水题...
206. 反转链表 反转链表 - 反转链表 - 力扣(LeetCode)leetcode-cn.com/problems/reverse-linked-list/solution/fan-zhuan-lian-biao-by-leetcode/ 题目描述 反转一个单链表。 示例: 输入: 1->2->3->4->5->NULL 输出: 5->4->3->2->1->NULL ...
作者:24shi-01fen-_00_01 链接:https://leetcode-cn.com/problems/reverse-linked-list/solution/206fan-zhuan-lie-biao-die-dai-di-gui-by-24shi-01fe/ classSolution {public: ListNode* reverseList(ListNode*head) {if(head == NULL || head->next == NULL)returnhead; ListNode* p = reverseList...
Leetcode刷题 206. 反转链表 递归迭代两种方法实现 |0题目链接 链接:https://leetcode-cn.com/problems/reverse-linked-list/ 2|0题目描述 反转一个单链表。 示例: 输入: 1->2->3->4->5->NULL 输出: 5->4->3->2->1->NULL 进阶: 你可以迭代或递归地反转链表。你能否用两种方法解决这道题?
【LeetCode #206】反转链表 反转一个单链表。 示例: 输入: 1->2->3->4->5->NULL 输出: 5->4->3->2->1->NULL 解题思路: 递归版与迭代版两种思路,不过形式都一样的!主要循环步骤如下: 使用pre与cur两个指针,进行如下操作 使用临时变量储存cur.next,因为下面需要修改,修改后就找不到了 ...
classSolution{boolean[]col;boolean[]digt1;boolean[]digt2;int n;List<List<String>>ret;char[][]path;publicList<List<String>>solveNQueens(int _n){n=_n;path=newchar[n][n];col=newboolean[n];digt1=newboolean[2*n];digt2=newboolean[2*n];ret=newArrayList<>();//遍历我们的二维数组进行填...
This repository contains the solutions and explanations to the algorithm problems on LeetCode. Only medium or above are included. All are written in C++/Python and implemented by myself. The problems attempted multiple times are labelled with hyperlinks.
class Solution: def twoSum(self, nums: List[int], target: int) -> List[int]: hashtable = dict() for i, num in enumerate(nums): if target - num in hashtable: return [hashtable[target - num], i] hashtable[nums[i]] = i ...
Welcome to follow my subscription account on Wechat, I will update the newest updated problem solution and explanation. And also welcome to add me as your wechat friend. iOS APP - Leetcode Meet Me This app displays all practical coding problems from leetcode.com, and provids the solutions....