首先假设我们实现了将单链表逆序的函数,ListNode reverseListRecursion(ListNode head) ,传入链表头,返回逆序后的链表头。 接着我们确定如何把问题一步一步的化小,我们可以这样想。 把head 结点拿出来,剩下的部分我们调用函数 reverseListRecursion ,这样剩下的部分就逆序了,接着我们把 head 结点放到新链表的尾部就可...
//Reverse a linked list using recursion#include<iostream>usingnamespacestd;structnode{intdata; node* next; }; node* A;//思考局部头指针如何递归voidprint(node* p){if(p ==NULL)return;//递归中止条件cout << p->data <<" ";print(p->next); }voidreverse(node* prev){//递归时要用指针参数...
A linked list can be reversed either iteratively or recursively. Could you implement both? 反向链表,分别用递归和迭代方式实现。 递归Iteration: 新建一个node(value=任意值, next = None), 用一个变量 next 记录head.next,head.next指向新node.next,新 node.next 指向head,next 进入下一个循环,重复操作,...
ListNode p=reverseList(head.next); head.next.next=head; head.next=null;returnp; } }//这个的base case 很强。 如果head 是 null, return head = null。 如果 head 是一个节点(head.next == null), 那 return head。 它本身//一会到了recursion 的时候, 因为是最后一个节点, 所以 head.next = ...
Time: O(n) as we have to traverse all the nodes in the linked list. Space: O(1) as we use a dummy node as the fake head of the reversed list. Recursive solution class Solution { public ListNode reverseList(ListNode head) {
* Java method to reverse a linked list without recursion */publicvoidreverse() { Node pointer=head; Nodeprevious=null, current=null;while(pointer!=null) { current=pointer; pointer=pointer.next;// reverse the linkcurrent.next=previous;previous=current; ...
reverseSLL.java reverseSLL_recursive.java segregateEvenOdd.java sorted_insert_SLL.java Matrix Queue Recursion and backtracking SDE Sheet SQL Searching Sorting Stack TP Trees Trie LICENSE README.md notes template.cppBreadcrumbs GreyHacks /LinkedList /Doubly_Linked_List / Reverse.java Latest commit ...
recursion recursive reverse-strings reversestring reverse-string reverse-string-python reverse-string-recursion Updated on Jun 15, 2021 Python AhmedIbrahim336 / stacks Star 1 Code Issues Pull requests Apply Stacks using Linked list; include methods like push(), pop(), peek(), isEmpty(); ...
# Definition for singly-linked list.# class ListNode:# def __init__(self, x):# self.val = x# self.next = NoneclassSolution:defreverseList(self,head:ListNode)->ListNode:# solution three: recursionifnotheadornothead.next:returnhead
//recursion solutionclass Solution{public:ListNode*reverseList(ListNode*head){if(!head||!(head->next))returnhead;ListNode*node=reverseList(head->next);head->next->next=head;head->next=NULL;returnnode;}};