recursion

问题 Often when solving a recursive or dynamic programming problem, I find myself drawing a recursion tree to help simplify the question for me. However, for some questions which are complicated I have access to the solution but no idea how to draw the tree. What I have tried so far is printing out the calling function and it's parameters, and this has proved helpful in some examples. However, I saw this tree for fibonacci(5) here generated by mathematica in this answer: https://mathematica

问题 I am using a meta-data object to dynamically create a very large form (~400 inputs, though a small sample is shown in stackblitz example). I need to use the meta-data structure to carry input-specific information to the inputs (i.e. type of input, select options, step size, etc). When my html ng-template gets called recursively inside of a and subsequently , the parent form is not recognized. When I get past the initial recursion level, the ReactiveForm cannot trace to the desired formGroup.

问题 I have defined the following recursive array generator and am using Numba jit to try and accelerate the processing (based on this SO answer) @jit("float32[:](float32,float32,intp)", nopython=False, nogil=True) def calc_func(a, b, n): res = np.empty(n, dtype="float32") res[0] = 0 for i in range(1, n): res[i] = a * res[i - 1] + (1 - a) * (b ** (i - 1)) return res a = calc_func(0.988, 0.9988, 5000) I am getting a bunch of warnings/errors that I do not quite get. Would appreciate help in

问题 I have defined the following recursive array generator and am using Numba jit to try and accelerate the processing (based on this SO answer) @jit("float32[:](float32,float32,intp)", nopython=False, nogil=True) def calc_func(a, b, n): res = np.empty(n, dtype="float32") res[0] = 0 for i in range(1, n): res[i] = a * res[i - 1] + (1 - a) * (b ** (i - 1)) return res a = calc_func(0.988, 0.9988, 5000) I am getting a bunch of warnings/errors that I do not quite get. Would appreciate help in

问题 Recursion in javascript is eluding me. I'm almost there, but I'm a bit confused about the order of operations. Take for example the following function: function rangeOfNumbers(startNum, endNum) { if (endNum - startNum === 0) { return [startNum]; } else { var numbers = rangeOfNumbers(startNum, endNum - 1); numbers.push(endNum); return numbers; } } Questions I'm trying to figure out: Does this create a closure around numbers ? Does the function rangeOfNumbers return numbers every single time,

问题 Please consider an Recursive function : 1) int calc(int num) { 2) sum=sum+num;//sum is a global variable 3) num--; 4) if(num==0) 5) return sum; 6) calc(num); } It calculates the sum of an integer . My teacher told me it's not recursion, but a simple function call, because you need to pass num-- as an argument and return calc(num--) . I was shocked, as I knew only one thing when a function call itself, its recursion. She also gave the reason, that line no. 2 and 3 is stored extra in stack

问题 The split-list function takes a list and returns a list of two lists consisting of alternating elements of the input. I wrote the following: (defun split-list (L) (cond ((endp L) (list NIL NIL)) (t (let ((X (split-list (cdr L)))) (cond ((oddp (length L)) (list (cons (first L) (first X)) (cadr X))) (t (list (first X) (cons (first L) (cadr X))))))))) The output is as expected for odd numbered lists, the first list consisting of the 1st, 3rd, 5th etc elements and the second part consisting of

问题 The split-list function takes a list and returns a list of two lists consisting of alternating elements of the input. I wrote the following: (defun split-list (L) (cond ((endp L) (list NIL NIL)) (t (let ((X (split-list (cdr L)))) (cond ((oddp (length L)) (list (cons (first L) (first X)) (cadr X))) (t (list (first X) (cons (first L) (cadr X))))))))) The output is as expected for odd numbered lists, the first list consisting of the 1st, 3rd, 5th etc elements and the second part consisting of

问题 I am making dynamic menus using a recursive function and I have already made the menus and it display in the right order without any issues. And I receive the data for menu from service.js file and you can see the entire working application in the below code sandbox example, https://codesandbox.io/s/reactstrap-accordion-3uoz9 Requirement: Here I am in the need to find out the last level of menus and need to assign checkbox with value as their respective id {item.id} . Eg: For First menu one ,

问题 I am making dynamic menus using a recursive function and I have already made the menus and it display in the right order without any issues. And I receive the data for menu from service.js file and you can see the entire working application in the below code sandbox example, https://codesandbox.io/s/reactstrap-accordion-3uoz9 Requirement: Here I am in the need to find out the last level of menus and need to assign checkbox with value as their respective id {item.id} . Eg: For First menu one ,