Hygeia

摘要： 题目：Given a sorted linked list, delete all nodes that have duplicate numbers, leaving onlydistinctnumbers from the original list.For example,Given1->2-... 阅读全文

摘要： 题目：Given a sorted linked list, delete all duplicates such that each element appear onlyonce.For example,Given1->1->2, return1->2.Given1->1->2->3->3, r... 阅读全文

摘要： 题目：Remove all elements from a linked list of integers that have valueval.ExampleGiven:1 –> 2 –> 6 –> 3 –> 4 –> 5 –> 6,val= 6Return:1 –> 2 –> 3 –> 4 –>... 阅读全文

摘要： 题目：Given a linked list, remove thenthnode from the end of list and return its head.For example, Given linked list: 1->2->3->4->5, and n = 2. After... 阅读全文

摘要： 题目：Reverse a singly linked list.代码：看不懂，我已经没救了 1 public ListNode reverseList(ListNode head) { 2 if (head == null) return head; 3 Li... 阅读全文

摘要： 题目： Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node contains 阅读全文

摘要： 题目：Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST.Callingnext()will return the n... 阅读全文

摘要： 题目：Given a binary tree, determine if it is height-balanced.For this problem, a height-balanced binary tree is defined as a binary tree in which the de... 阅读全文

摘要： 题目：Write a SQL query to delete all duplicate email entries in a table namedPerson, keeping only unique emails based on itssmallestId.+----+-----------... 阅读全文

摘要： 题目：Given aWeathertable, write a SQL query to find all dates' Ids with higher temperature compared to its previous (yesterday's) dates.+---------+-----... 阅读全文