随笔分类 - LeetCode
摘要：X is a good number if after rotating each digit individually by 180 degrees, we get a valid number that is different from X. Each digit must be rotate
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摘要：Given a string S, we can transform every letter individually to be lowercase or uppercase to create another string. Return a list of all possible stri
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摘要：You're given strings J representing the types of stones that are jewels, and S representing the stones you have. Each character in Sis a type of stone
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摘要：A matrix is Toeplitz if every diagonal from top-left to bottom-right has the same element. Now given an M x N matrix, return True if and only if the m
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摘要：Given an array of integers, 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements that appear twi
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摘要：Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id. For example, aft
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摘要：Given a Weather table, write a SQL query to find all dates' Ids with higher temperature compared to its previous (yesterday's) dates. For example, ret
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摘要：Given a table salary, such as the one below, that has m=male and f=female values. Swap all f and m values (i.e., change all f values to m and vice ver
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摘要：Write a SQL query to get the second highest salary from the Employee table. For example, given the above Employee table, the query should return 200 a
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摘要：There is a table courses with columns: student and class Please list out all classes which have more than or equal to 5 students. For example, the tab
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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
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摘要：The Employee table holds all employees including their managers. Every employee has an Id, and there is also a column for the manager Id. Given the Em
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摘要：Write a SQL query to find all duplicate emails in a table named Person. For example, your query should return the following for the above table: Note:
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摘要：Table: Person Table: Address Write a SQL query for a report that provides the following information for each person in the Person table, regardless if
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摘要：X city opened a new cinema, many people would like to go to this cinema. The cinema also gives out a poster indicating the movies’ ratings and descrip
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摘要：There is a table World A country is big if it has an area of bigger than 3 million square km or a population of more than 25 million. Write a SQL solu
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摘要：You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fails the quality c
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摘要：Given a 32-bit signed integer, reverse digits of an integer. Example 1: Example 2: Example 3: Note:Assume we are dealing with an environment which cou
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摘要：Implement the following operations of a stack using queues. push(x) -- Push element x onto stack. pop() -- Removes the element on top of the stack. to
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摘要：Given a linked list, determine if it has a cycle in it. Follow up:Can you solve it without using extra space? 判断一个链表是否有环 C++（10ms）：
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