recursion

问题 Can anyone help me understand how this recursive CTE works? WITH RECURSIVECTE (EMPID, FULLNAME, MANAGERID, [ORGLEVEL]) AS (SELECT EMPID, FULLNAME, MANAGERID, 1 FROM RECURSIVETBL WHERE MANAGERID IS NULL UNION ALL SELECT A.EMPID, A.FULLNAME, A.MANAGERID, B.[ORGLEVEL] + 1 FROM RECURSIVETBL A JOIN RECURSIVECTE B ON A.MANAGERID = B.EMPID) SELECT * FROM RECURSIVECTE; 回答1: Recursive CTEs in SQL Server have 2 parts: The Anchor : Is the starting point of your recursion. It's a set that will be further

问题 Im trying to solve the coin change problem. You get an amount of money (as example 55 cents) and have to give as few coins as possible back. My solution is very simple (and probably extremely inefficient). I tried to do it with brute force. First I tried to do it with fixed coins which are hardcoded and it worked great money = 55 def findMinCoins(money): nq = int(money/25) nd = int(money/10) nc = int(money/1) smallest = nq + nd + nc for q in range(nq+1): for d in range(nd+1): for c in range

问题 function singleDigit(num) { let counter = 0 let number = [...num + ''].map(Number).reduce((x, y) => {return x * y}) if(number <= 9){ console.log(number) }else{ console.log(number) return singleDigit(number), counter += 1 } } singleDigit(39) The code above takes an integer and reduces it to a single digit by multiplying it by its own digits. Example is 39. 3 x 9 = 27. 2 x 7 = 14. 1 x 4 = 4. The console will log: 27 14 4 How do I keep track that the recursive function was called 3 times? I have

问题 I found an example how to move all files recursively, but I would like to keep the same folder structure in the destination folder. import fnmatch import os import shutil rootPath = '/Volumes/VoigtKampff/Temp/TEST/' destDir = '/Volumes/VoigtKampff/Temp/TEST2/' matches = [] for root, dirnames, filenames in os.walk(rootPath): for filename in fnmatch.filter(filenames, '*.mp4'): matches.append(os.path.join(root, filename)) print(os.path.join(root, filename)) shutil.move(os.path.join(root,

问题 I'm trying to compute large numbers of the Fibonacci sequence, hence why I am using big integer. I can get up to about 10000 the way it is, but I run out of stack space. I realize I can increase stack and heap space, but it is my understanding that tail recursion can get around the space issue. Here is my code.. public class FibRecursion{ static BigInteger[] fval; public static void main(String[] args) { int index; Scanner input = new Scanner(System.in); index = input.nextInt(); fval = new

问题 I have a C# program that utilizes console to perform actions in a zoo. Currently I am being asked to use a private static method to show children of animals I have in my zoo. Then children of their children etc... I have another method that when typed in the console first finds the specific animal, then calls another static WalkTree method with the passed in animal. The WalkTree method is to perform a recursive method and output a tree like diagram of the children found to the console. Each

问题 I have a C# program that utilizes console to perform actions in a zoo. Currently I am being asked to use a private static method to show children of animals I have in my zoo. Then children of their children etc... I have another method that when typed in the console first finds the specific animal, then calls another static WalkTree method with the passed in animal. The WalkTree method is to perform a recursive method and output a tree like diagram of the children found to the console. Each

问题 I have a C# program that utilizes console to perform actions in a zoo. Currently I am being asked to use a private static method to show children of animals I have in my zoo. Then children of their children etc... I have another method that when typed in the console first finds the specific animal, then calls another static WalkTree method with the passed in animal. The WalkTree method is to perform a recursive method and output a tree like diagram of the children found to the console. Each

问题 I will be happy to get some help. I have the following problem: I'm given a list of numbers seq and a target number and I need to write 2 things: A recursive solution that returns True if there is a sum of a subsequence that equals the target number and False otherwise. example: subset_sum([-1,1,5,4],0) # True subset_sum([-1,1,5,4],-3) # False Secondly, I need to write a solution using what I wrote in the previous solution but now with memoization that uses a dictionary in which the keys are

问题 I will be happy to get some help. I have the following problem: I'm given a list of numbers seq and a target number and I need to write 2 things: A recursive solution that returns True if there is a sum of a subsequence that equals the target number and False otherwise. example: subset_sum([-1,1,5,4],0) # True subset_sum([-1,1,5,4],-3) # False Secondly, I need to write a solution using what I wrote in the previous solution but now with memoization that uses a dictionary in which the keys are