recursion

问题 I'm trying to write code for the Knight's Tour: A knight's tour is a sequence of moves of a knight on a chessboard such that the knight visits every square exactly once. I've been trying to alter someone else's code, but the backtracking seems to not work properly - it never finds the solution. It works perfectly fine when the knight starts at 0, 0 but if it starts at any other spot on the 2D grid, the program goes on forever. Where is the bug in this code? #include <iostream> #include <ctime

问题 Is there a away to create a sum function that works with both recursive call (e.g (1)(2)(3)(4)), and multiple arguments (e.g (1, 2, 3, 4))? Like this: sum(5, 5) // 10 sum(5)(5) // 10 Thank you. 回答1: You could return a function for next arguments and implement a toString method. function sum() { var add = function (a, b) { return a + b; }, value = Array.prototype.reduce.call(arguments, add, 0); function f() { value = Array.prototype.reduce.call(arguments, add, value); return f; }; f.toString =

问题 Hi I have a json string converted unsing the JSON framework into a dictionary and I need to extract its content. How could I iterate to the nested dictionaries? I have already this code that allows me to see the dictionary: NSDictionary *results = [responseString JSONValue]; NSMutableArray *catArray = [NSMutableArray array]; for (id key in results) { NSLog(@"key: %@, value: %@", key, [results objectForKey:key]); [catArray addObject:key]; NSString *cat = key; } Could someone provide a sample

问题 I have a model, which looks like: class StaffMember(models.Model): id = models.OneToOneField(to=User, unique=True, primary_key=True, related_name='staff_member') supervisor = models.ForeignKey(to='self', null=True, blank=True, related_name='team_members') My current hierarchy of team is designed in such a way that there is let's say an Admin (who is at the top most point of hierarchy). Now, let's say 3 people (A, B, C) report to Admin and each one of A, B and C have their own team reporting

问题 I'm writing a program that is to take a number between 1-10 and display all possible ways of arranging the numbers. Ex input: 3 output: 1 2 3 1 3 2 2 1 3 2 3 1 3 1 2 3 2 1 Whenever I input 9 or 10, the program gives a segmentation fault and dumps the core. I believe the issue is my recursive algorithm is being called too many times. Could someone help point out how I could limit the amount of recursive calls necessary? Here is my current code: void rearange(int numbers[11], int index, int num

问题 I can see this question (or a similar one) has been asked a few times and I've searched google a lot so that I can try to understand it however I am most definitely stuck. My task is to use a recursive function that uses a "goodness" variable to determine which is the best move a computer can make, I even have a document that is meant to help with this but for the life of me, I just don't understand it. If anyone could take some time to help me or break down what I actually need to do i'd be

问题 I can see this question (or a similar one) has been asked a few times and I've searched google a lot so that I can try to understand it however I am most definitely stuck. My task is to use a recursive function that uses a "goodness" variable to determine which is the best move a computer can make, I even have a document that is meant to help with this but for the life of me, I just don't understand it. If anyone could take some time to help me or break down what I actually need to do i'd be

问题 I can see this question (or a similar one) has been asked a few times and I've searched google a lot so that I can try to understand it however I am most definitely stuck. My task is to use a recursive function that uses a "goodness" variable to determine which is the best move a computer can make, I even have a document that is meant to help with this but for the life of me, I just don't understand it. If anyone could take some time to help me or break down what I actually need to do i'd be

问题 I wrote a function to return a generator containing every unique combination of sub-strings a given length that contain more than n elements from a primary string. As an illustration: if i have 'abcdefghi' and a probe of length of two, and a threshold of 4 elements per list i'd like to get: ['ab', 'cd', 'ef', 'gh'] ['ab', 'de', 'fg', 'hi'] ['bc', 'de', 'fg', 'hi'] My first attempt at this problem involved returning a list of lists. This ended up overflowing the memory of the computer. As a

问题 I have been presented with a new homework assignment that has been somewhat frustrating to say the least. Basically, I have a create a 2D array of integers as follows: 97 47 56 36 60 31 57 54 12 55 35 57 41 13 82 80 71 93 31 62 89 36 98 75 91 46 95 53 37 99 25 45 26 17 15 82 80 73 96 17 75 22 63 96 96 36 64 31 99 86 12 80 42 74 54 14 93 17 14 55 14 15 20 71 34 50 22 60 32 41 90 69 44 52 54 73 20 12 55 52 39 33 25 31 76 45 44 84 90 52 94 35 55 24 41 63 87 93 79 24 and I am to write a recursive