随笔分类 - LeetCode
摘要：Write a function that takes a string as input and reverse only the vowels of a string. Example 1:Given s = "hello", return "holle". Example 2:Given s
阅读全文
摘要：Write a function that reverses a string. The input string is given as an array of characters char[]. Do not allocate extra space for another array, yo
阅读全文
摘要：Given a positive integer n, break it into the sum of at least two positive integers and maximize the product of those integers. Return the maximum pro
阅读全文
摘要：Given an integer (signed 32 bits), write a function to check whether it is a power of 4. Example 1: Example 2: Input: 5 Output: false Example 2: Follo
阅读全文
摘要：Given a text file file.txt that contains list of phone numbers (one per line), write a one liner bash script to print all valid phone numbers. You may
阅读全文
摘要：Write a bash script to calculate the frequency of each word in a text file words.txt. For simplicity sake, you may assume: words.txt contains only low
阅读全文
摘要：Given a text file file.txt, transpose its content. You may assume that each row has the same number of columns and each field is separated by the ' '
阅读全文
摘要：How would you print just the 10th line of a file? For example, assume that file.txt has the following content: Your script should output the tenth lin
阅读全文
摘要：The Trips table holds all taxi trips. Each trip has a unique Id, while Client_Id and Driver_Id are both foreign keys to the Users_Id at the Users tabl
阅读全文
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
阅读全文
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
阅读全文
摘要：The Employee table holds all employees. Every employee has an Id, and there is also a column for the department Id. The Department table holds all dep
阅读全文
摘要：The Employee table holds all employees. Every employee has an Id, a salary, and there is also a column for the department Id. The Department table hol
阅读全文
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
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:
阅读全文
摘要：Given a nested list of integers, implement an iterator to flatten it. Each element is either an integer, or a list -- whose elements may also be integ
阅读全文
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
阅读全文
摘要：Write a SQL query to find all numbers that appear at least three times consecutively. For example, given the above Logs table, 1 is the only number th
阅读全文
摘要：Write a SQL query to rank scores. If there is a tie between two scores, both should have the same ranking. Note that after a tie, the next ranking num
阅读全文
摘要：Given a string, find the length of the longest substring T that contains at most k distinct characters. Example 1: Input: s = "eceba", k = 2 Output: 3
阅读全文
