这一点太弱了。 booljudge(structListNode *p,structListNode *q) {while( p &&q) {if(p->val != q->val)returnfalse; p= p->next; q= q->next; }returnp==NULL && q==NULL; }boolisPalindrome_using_count(structListNode*head) {inti,n =0;structListNode * p = head, *last = NULL, *...
n= n / 2;while(n-- > 0) tmpHead =tmpHead.next; ListNode reverse= reverseList(tmpHead);//反转while(reverse !=null){//比较反转后的链表,与正序链表if(head.val != reverse.val)returnfalse; head=head.next; reverse=reverse.next; }returntrue; }privateListNode reverseList(ListNode head){//...
Given a linked list, determine if it has a cycle in it. Follow up: Can you solve it without using extra space? 题意:如何判断链表是否有环 这是一个经典的问题,后面还有追问: 如果有环,计算环的长度? 找到碰撞点的位置? 首先,如何找环,设计两个指针,分别从链表的头节点开始,... ...
716 - Linked List, Two pointers (同向雙指針 →→) / slow, fast (快慢雙指針), Two pointers (背向雙指針 ←→) 內容目錄 題目出處 難度 個人範例程式碼 – Deque (比較進階),空間 O(N) 算法說明 input handling Boundary conditions 個人範例程式碼 – 同向 two pointer, 使用空間 O(N/2) stack...
234. Palindrome Linked List Given a singly linked list, determine if it is a palindrome. Follow up: Could you do it in O(n) time and O(1) space? /** * Definition for singly-linked list. * public class ListNode { * int val;...
https://leetcode.com/problems/palindrome-linked-list/discuss/64501/Java-easy-to-understand https://github.com/abesft/leetcode/blob/master/234PalindromeLinkedList/234PalindromeLinkedList.cpp#include <iostream> #include<vector> using namespace std; class Solution { public: bool isPalindrome(ListNode* ...
Construct the original linked list by reversing the second half again and attaching it back to the first half. Note:This approach takes O(n) time and O(1) extra space. Approach 2(Using recursion) For Palindrome Linked List: Use two pointersleftandright. Move right and left using recursion...
Return 1 since the palindrome partitioning [“aa”,”b”] could be produced using 1 cut. 思路: dp c[i]表示从下标0~i的字符串 最少由几个回文串组合而成 dp[i][j]表示下标j~i的字符串是否是回文串 状态转移方程: 0<=j<=i if j~i是回文串 ...
Original Singly List: 1 2 2 1 Linked list is a palindrome. Original Singly List: MADAM Linked list is a palindrome. Flowchart : Write a C program to check if a singly linked list is a palindrome using a stack-based approach. Write a C program to recursively determine if a linked list...
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