/** * Source : https://oj.leetcode.com/problems/reorder-list/ * * Given a singly linked list L: L0→L1→…→Ln-1→Ln, * reorder it to: L0→Ln→L1→Ln-1→L2→Ln-2→… * * You must do this in-place without altering the nodes' values. * * For example, * Given {1,2,...
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You must do this in-place without altering the nodes' values. For example, Given{1,2,3,4}, reorder it to{1,4,2,3}. https://oj.leetcode.com/problems/reorder-list/ 思路:分三步走 从中间把链表分开(双指针法) 把后面的链表反序 合并两个链表 publicclassSolution {publicvoidreorderList(List...
Given a singly linked list, return a random node's value from the linked list. Each node must have the same probability of being chosen. Solution import random class ListNode: def __init__(self, val=0, next=None): self.val = val self.next = next class Solution: def __init__(self...
题目Given an array and a value, remove all instances of that value in place and return the new length.Do not allocate extra space for another array, you must do this in place with constant memory.The order of elements can be changed. It doesn't matter what WZEARW 2018/04/09 6750 ...
Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory. You may assume all the characters consist of printable ascii characters. Example 1: Input: ["h","e","l","l","o"] Output: ["o","l","l","e","h"...
You must implement the functions of the class such that each function works inaverageO(1)time complexity. Key Points pre-assumption: ramdom.choice(arr) takes constant time we can use a list to store all inserted numbers, but how to delete one in constant time?
用Stack:leetcode.com/problems/a You are given two non-empty linked lists representing two non-negative integers. The most significant digit comes first and each of their nodes contain a single digit. Add the two numbers and return it as a linked list. You may assume the two numbers do ...
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It can be solved in many different ways that if we are to describe them you’ll be bored and tired of reading that amount of information. I’m pretty sure many of you struggle to understand how this data structure works and where it works can be used to help you understand how it ...