recursion

问题 I have a Java function that receives a matrix (2-dimensional array[][]) and creates a dynamic array of options of changes for this array, and then recursively creates a dynamic array for each option of the dynamic array. Eventually for each option in one of N options it creates N other options. I was told that the function of time complexity of it is T(n)=T(n)*n, is this possible? And what is the asymptotic time complexity of it in big O notation? 回答1: If the recurrence relation is T(n)=nT(n)

问题 This is a follow-up to this question. I have lists or "records" that are appended together into an empty list, that are each in the format (Matthew (AL 21 32)) . I am now trying to write a function that would use fetchRecord in order to find the desired record and then multiply the two numbers inside the record. However, my current code works only if I am getting the name on the first record but it returns an empty list for any record after that. Here is my code: (define (Mult_Num name) (cond

问题 I am trying to run this code to calculate Q(n) at different Tn in the Equation 16.4 in the attached picture.But its not giving me the correct output. I would appreciate any help. Note: delta1=delta2 =...deltan = dt=1 ( I have taken here ) and further divided S term by 10000 just because in the Equation it is in basis point i.e. 100th part of 1 %. Function Bootstrap(S As Range, Z As Range, L As Double) As Double Dim j As Integer Dim a As Variant Dim b As Variant Dim n As Integer Dim Q() As

问题 write a recursive function that return the minimum element in an array where C is the array and s is the size. this is my code. c = [2,5,6,4,3] def min (c, s): smallest = c[0] if c[s] < smallest: smallest = c[s] else: return min print min (c,s) errors : s is not defined. 回答1: First of all, I'd caution the use of min as a function name. Min is a python built in so use as your own function name may cause unwanted results in your code. If I'm understanding the code and your question correctly,

问题 I want to write a recursive function in javascript that returns an array with its elements reversed. This code generates the following error: undefined is not a function function reverseArray (toBeReversed){ var reversed = []; function reverser (toBeReversed){ if (toBeReversed.length == 1) reversed.push(toBeReversed[0]); else { reversed.push(toBeReversed.lastOfIndex(0)); //error on this line reverser(toBeReversed.slice(-1)); } } reverser(toBeReversed); return reversed; } 回答1: lastOfIndex is

问题 I'm trying to write a program for an assignment. The requirements are to create Pascal's Triangle recursively and then print a given line. However, after compiling my program, I get several ArrayIndexOutOfBoundsExceptions. Here is the stack trace: java.lang.ArrayIndexOutOfBoundsException: 10 at pasTriangle.populateT(pasTriangle.java:79) at pasTriangle.populateT(pasTriangle.java:86) at pasTriangle.populateT(pasTriangle.java:86) at pasTriangle.populateT(pasTriangle.java:86) at pasTriangle

问题 public static void allCombination(char[] S, int start, int r, String output) { int length = S.length; if (r == 1) { for (int i = start; i < length; i++) { System.out.println(output + S[i]); } } else { for (int k = start; k < length - r + 1; k++) { allCombination(S, k + 1, r - 1, output + S[k]); } } Hey tied to run above code to make possible combination of a given String(I took it from internet).Can you tell me how this recursion work and how i draw recursion tree for that(I am new to

问题 public static void allCombination(char[] S, int start, int r, String output) { int length = S.length; if (r == 1) { for (int i = start; i < length; i++) { System.out.println(output + S[i]); } } else { for (int k = start; k < length - r + 1; k++) { allCombination(S, k + 1, r - 1, output + S[k]); } } Hey tied to run above code to make possible combination of a given String(I took it from internet).Can you tell me how this recursion work and how i draw recursion tree for that(I am new to

问题 /* A Naive recursive implementation of LIS problem */ #include<stdio.h> #include<stdlib.h> /* To make use of recursive calls, this function must return two things: 1) Length of LIS ending with element arr[n-1]. We use max_ending_here for this purpose 2) Overall maximum as the LIS may end with an element before arr[n-1] max_ref is used this purpose. The value of LIS of full array of size n is stored in *max_ref which is our final result */ int _lis( int arr[], int n, int *max_ref) { /* Base

问题 I’m new to Python and have been teaching myself with textbooks and StackOverflow. I seem to learn best from real world examples from this site. I’m hoping someone can help me with my current problem. I have a directory (folder) with about 1,000 files. The files have names with prefixes (patterns) such as, aaa_* , bbb_* , ccc_* and so on. I would like to iterate through the directory and copy all the files that have the specified prefix and move them to a new directory with that prefix name.