palindrome Python 字符串反转string[::-1] Slice notation "[a : b : c]" means "count in increments of c starting at a inclusive, up to b exclusive". If c is negative you count backwards, if omitted it is 1. If a is
# Definition for singly-linked list. # class ListNode: # def __init__(self, val=0, next=None): # self.val = val # self.next = next class Solution: def isPalindrome(self, head: Optional[ListNode]) -> bool: if not head: return False slow = head fast = head.next while fast and...
Following the function definition, the program takes user input and calls theis_palindromefunction. If the function returnsTrue, the string is identified as a palindrome, andPalindromeis printed; otherwise,Not Palindromeis printed. Code Output ...
/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val... 9. Palindrome Number 9. Palindrome Number 题目 题目解析:判断一个数字是不是回文数。 回文数的定义如下:一个数字和它倒置以后相等,则为回文数。 要求:无需额外的空间 要注...
1#Definition for singly-linked list.2#class ListNode:3#def __init__(self, x):4#self.val = x5#self.next = None67classSolution:8#@param {ListNode} head9#@return {boolean}10defisPalindrome(self, head):11start = p = q = r =ListNode(0)12start = p =head13length =014isOne =False...
# Definition for singly-linked list. # class ListNode: # def __init__(self, x): # self.val = x # self.next = None class Solution(object): def isPalindrome(self, head): """ :type head: ListNode :rtype: bool """ node_list=[] while head: node_list.append(head) head=head.ne...
# Definition for singly-linked list.# class ListNode:# def __init__(self, x):# self.val = x# self.next = Noneclass Solution:def isPalindrome(self, head: ListNode) -> bool:if head == None:return True# 1、复制链表 head 为 head1# dummy、dummy1 不断后移,head、head1 不动head1 ...
The following codes in space O(1). #Definition for singly-linked list.#class ListNode(object):#def __init__(self, x):#self.val = x#self.next = NoneclassSolution(object):defisPalindrome(self, head):""":type head: ListNode :rtype: bool"""#two pointer techniquefast = slow =head#fi...