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 {1,2,3,4}, reorder it to {1,4,2,3}. (1)找出中间节点 (2)将后部分节点反转 (3)将前部分节点和后部分节点合并 #include…

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/** * 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,…

题意: 给你一个单链表 a1 a2 a3 a4 a5....an 让你变成 a1 an a2 an-1 a3 an-2 .... 这里牵涉到,单链表的倒置和两个单链表的合并. class Solution { public: void reorderList(ListNode *head) { if (!head || !head->next)return; //空表和只有一个元素的链表不用操作 //快慢指针找中间位置 ListNode *fast = head; ListNode *slow…

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{1,2,3,4}, reorder it to{1,4,2,3}. 由于链表尾端不干净,导致fast->next!=NULL&&fast->next-&…

Given a singly linked list L: L 0→L 1→-→L n-1→L n, reorder it to: L 0→L n →L 1→L n-1→L 2→L n-2→- 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}. C++ /** * Definition for singly-linked…

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 {1,2,3,4}, reorder it to {1,4,2,3}. 这道链表重排序问题可以拆分为以下三个小问题: 1. 使用快慢指针来找到链表的中点,并将链表从中…

利用堆栈:http://oj.leetcode.com/problems/evaluate-reverse-polish-notation/http://oj.leetcode.com/problems/longest-valid-parentheses/ (也可以用一维数组,贪心)http://oj.leetcode.com/problems/valid-parentheses/http://oj.leetcode.com/problems/largest-rectangle-in-histo…

一直直到bug-free.不能错任何一点. 思路不清晰:刷两天. 做错了,刷一天. 直到bug-free.高亮,标红. 185,OA(YAMAXUN)--- (1) findFirstDuplicate string in a list of string. import java.util.HashSet; import java.util.Set; public class Solution { public static void main(String[] args) { String[…