bernieloveslife

2018年11月7日

摘要： A robot is located at the top left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right at any p 阅读全文

posted @ 2018-11-07 13:08 bernieloveslife 阅读(114) 评论(0) 推荐(0)

32.Longest Valid Parenttheses

摘要： Given a string containing just the characters '(' and ')', find the length of the longest valid (well formed) parentheses substring. Example 1: Input: 阅读全文

posted @ 2018-11-07 13:08 bernieloveslife 阅读(219) 评论(0) 推荐(0)

105.Construct Binary Tree from Preorder and Inorder Traversal

摘要： Given preorder and inorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. For example, 阅读全文

posted @ 2018-11-07 13:08 bernieloveslife 阅读(107) 评论(0) 推荐(0)

2018年11月6日

83.Remove Duplicates from Sorted List

摘要： Given a sorted linked list, delete all duplicates such that each element appear only once. Example 1: Input: 1 1 2 Output: 1 2 Example 2: Input: 1 1 2 阅读全文

posted @ 2018-11-06 15:52 bernieloveslife 阅读(92) 评论(0) 推荐(0)

405.Convert a Number to Hexadecimal

摘要： Given an integer, write an algorithm to convert it to hexadecimal. For negative integer, two’s complement method is used. Note: All letters in hexadec 阅读全文

posted @ 2018-11-06 15:52 bernieloveslife 阅读(126) 评论(0) 推荐(0)

236.Lowest Common Ancestor of a Binary Tree

摘要： Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. According to the definition of LCA on Wikipedia: “The lowes 阅读全文

posted @ 2018-11-06 15:52 bernieloveslife 阅读(108) 评论(0) 推荐(0)

235.Lowest Common Ancestor of a Binary Search Tree

摘要： Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST. According to the definition of LCA on Wikipedia 阅读全文

posted @ 2018-11-06 15:52 bernieloveslife 阅读(94) 评论(0) 推荐(0)

415.Add Strings

摘要： Given two non negative integers num1 and num2 represented as string, return the sum of num1 and num2. Note: 1. The length of both num1 and num2 is 9: 阅读全文

posted @ 2018-11-06 15:52 bernieloveslife 阅读(154) 评论(0) 推荐(0)

2018年11月5日

183.Customers Who Never Order

摘要： Suppose that a website contains two tables, the Customers table and the Orders table. Write a SQL query to find all customers who never order anything 阅读全文

posted @ 2018-11-05 15:14 bernieloveslife 阅读(129) 评论(0) 推荐(0)

232.Implement Queue using Stacks

摘要： Implement the following operations of a queue using stacks. push(x) Push element x to the back of queue. pop() Removes the element from in front of qu 阅读全文

posted @ 2018-11-05 15:14 bernieloveslife 阅读(119) 评论(0) 推荐(0)

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