原创 【Leetcode Shell】Transpose File
題目： Given a text file file.txt, transpose its content. You may assume that each row has the same number of columns
2020-06-14 04:15:56
原创 【Leetcode Database】Delete Duplicate Emails
題目： Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails ba
2020-06-14 04:15:56
原创 【Leetcode Shell】Word Frequency
題目： Write a bash script to calculate the frequency of each word in a text file words.txt. For simplicity sake, you m
2020-06-14 04:15:56
原创 【Leetcode Shell】Valid Phone Numbers
題目： Given a text file file.txt that contains list of phone numbers (one per line), write a one liner bash script to
2020-06-14 04:15:56
原创 【Leetcode Database】Duplicate Emails
題目： Write a SQL query to find all duplicate emails in a table named Person. +----+---------+ | Id | Email | +----+-
2020-02-21 00:11:36
原创 【Leetcode Database】Employees Earning More Than Their Managers
題目： The Employee table holds all employees including their managers. Every employee has an Id, and there is also a c
2020-02-21 00:11:36
原创 【Leetcode Algorithm】Valid Parentheses
Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is
2020-02-21 00:11:36
原创 【Leetcode Shell】Tenth Line
題目： How would you print just the 10th line of a file? For example, assume that file.txt has the following content:
2020-02-21 00:11:36
原创 【Leetcode Database】Combine Two Tables
問題： Table: Person +-------------+---------+ | Column Name | Type | +-------------+---------+ | PersonId | int
2020-02-21 00:11:35
原创 【Leetcode Algorithm】Reverse Linked List
Reverse a singly linked list. Hint: A linked list can be reversed either iteratively or recursively. Could you imple
2020-02-21 00:11:34
原创 Matlab仿真AF-MIMO-Relay筆記
今天開始在CSDN寫博客了~ 最近一直在忙着搞仿真，主要是關於中繼放大轉發的，從兩個月前什麼都不會的小白，到現在有了入門的喜悅，真是付出纔會有回報啊！ 這些天搞科研的收穫是： 1、一定要認真。 剛開始查了大量資料，和學長反覆論證推敲，有了
2020-02-21 00:11:34
原创 【Leetcode Algorithm】Remove Nth Node From End of List
題目： Given a linked list, remove the nth node from the end of list and return its head. For example, Given linked
2020-02-21 00:11:24
原创 【Leetcode Algorithm】Merge Two Sorted Lists
Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes
2020-02-21 00:11:23
原创 【Leetcode Algorithm】Contains Duplicate
題目： Given an array of integers, find if the array contains any duplicates. Your function should return true if any valu
2020-02-21 00:11:23
原创 鏈表反轉的四種方法分析
關於反轉鏈表的總結： 反轉鏈表的方式有很多，現在介紹四種： 非遞歸的： 從圖中可以看到，對n個節點的反轉，方法一指針指向改變了2^(n-1)次，還有一個額外的節點，而方法二用了2^(n-1)次，卻沒有增加額外節點。方法三既沒有增
2020-02-21 00:11:23