题目描述 Given a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary tree …

双指针法 复杂度 时间 O(N) 空间 O(1) 思路 先算出两个链表各自的长度，然后从较长的链表先遍历，遍历到较长链表剩余长度和较短链表一样时，用两个指针同时遍历两个链表。这样如果链表有交点的话，两个指针已经一定会相遇…

Add Two Numbers You are given two linked lists representing two non-negative numbers. The digits are stored in…

欢迎fork and star：Nowcoder-Repository-github 132. Palindrome Partitioning II 题目 Given a string s, partition s su…

  You are given a m x n 2D grid initialized with these three possible values. -1 – A wall or an obs…

题目： Given a string s consists of upper/lower-case alphabets and empty space characters ' ', ret…

Given an array of integers, find if the array contains any duplicates.Your function should return true if any …

Longest Valid Parentheses Given a string containing just the characters ‘(‘ and ‘)’, f…

59. Spiral Matrix II 题目 Given an integer n, generate a square matrix filled with elements from 1 to n2 in spir…

  Given an array of integers, find if the array contains any duplicates. Your function should return true…

  Given a time represented in the format “HH:MM”, form the next closest time by reusing the c…

题目描述 Remove all elements from a linked list of integers that have value val. Example Given: 1 –> 2 –> 6 …