题目描述 Given a singly linked list, determine if it is a palindrome. Follow up: Could you do it in O(n) time and …

Unique Substrings in Wraparound String Consider the string s to be the infinite wraparound string of "abcdefgh…

题目 You are given two non-empty linked lists representing two non-negative integers. The digits are stored in r…

写在前面 最近经常觉得自己越来越笨，一些很简单的问题愣是想不出来。今天去leetcode上做了几道题，面对上学时不止一次刷过的题目竟然有的连最笨的方法都想不出来。感觉还是要经常用用脑子，不然真的会生锈。。。 算法对我目前…

题目描述： 给定一个字符串 (s) 和一个字符模式 (p)。实现支持 ‘.’ 和 ‘‘ 的正则表达式匹配。 ‘.’ 匹配任意单个字符。 ‘…

岛屿的个数 题目叙述： 给定一个由 ‘1’（陆地）和 ‘0’（水）组成的的二维网格，计算岛屿的数量。一个岛被水包围，并且它是通过水平方向或垂直方向上相邻的陆地连接而成的。你…

Two elements of a binary search tree (BST) are swapped by mistake. Recover the tree without changing its struc…

题目 Given an array of integers, every element appears twice except for one. Find that single one. Note: Your al…

欢迎fork and star：Nowcoder-Repository-github 105. Construct Binary Tree from Preorder and Inorder Traversal 题目 G…

  In the “100 game,” two players take turns adding, to a running total, any integer from 1..1…

题目描述 Given a sorted array, remove the duplicates in place such that each element appear only once and return t…

Given a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can…