recursion

问题 The " simple/naive backtracking brute force algorithm", "Straightforward Depth-First Search" for sudoku is commonly known and implemented. and no different implementation seems to exist. (when i first wrote this question.. i wanted to mean we could completely standardize it, but the wording is bad..) This guy has described the algorithm well i think: https://stackoverflow.com/a/2075498/3547717 Edit: So let me have it more specified with pseudo code... var field[9][9] set the givens in 'field'

问题 This question already has answers here : calculate the sum of all element in a double array (12 answers) Closed 7 years ago . Hello I'm learning recursion in C and I am trying to find the sum of the elements. This is my main: int main() { int arr[] = {1,2,3,4,5}; int sum; sum = arr_sum(arr,4); printf("\nsum is:%d",sum); return 0; } And my recursive function: //n is the last index of the array int arr_sum( int arr[], int n ) { // must be recursive int sum = 0; //base case: if (n < 0) { return

问题 This question already has answers here : calculate the sum of all element in a double array (12 answers) Closed 7 years ago . Hello I'm learning recursion in C and I am trying to find the sum of the elements. This is my main: int main() { int arr[] = {1,2,3,4,5}; int sum; sum = arr_sum(arr,4); printf("\nsum is:%d",sum); return 0; } And my recursive function: //n is the last index of the array int arr_sum( int arr[], int n ) { // must be recursive int sum = 0; //base case: if (n < 0) { return

问题 Before I start, I have to apologize for bringing up another case of permutations with duplicates. I have gone through most of the search results and can't really find what I am looking for. I have read about the Lexicographical order and have implemented it. For this question, I am suppose to implement a recursion method that prints out the all the strings of length n consisting of just the characters a and b that have an equal number of a and b’s. The strings must be printed out one line at

问题 This question already has answers here : Return in Recursive Function (3 answers) Closed 4 years ago . Python version: 2.7. OS: Windows 10 64-bit. Note: I have found a way around the issue described below that doesn't use try/except/else statements. I am asking the question below only because I am curious as to why the code behaves the way it does, and if there is a way to do what I am trying to do using try/except/else. I have a file called blah.py , with the following code: import os def

问题 This question already has answers here : Typescript: deep keyof of a nested object (2 answers) Closed 1 year ago . Is it possible to type an array of strings in such a way that the array can only be a valid property path in a given object? The type definition should work for all deeply nested objects. Example: const object1 = { someProperty: true }; const object2 = { nestedObject: object1, anotherProperty: 2 }; type PropertyPath<Type extends object> = [keyof Type, ...Array<string>]; // <--

问题 I've got some C# code that compiles fine under both mono and the Microsoft's .net compilers, but only runs on mono. The error message is (newlines added by me) Unhandled Exception: System.TypeLoadException: Could not load type 'Hasse.Groups.Heavy.Product.PowerGroup`1' from assembly 'Hasse, Version=1.0.x.y, Culture=neutral, PublicKeyToken=null' because it has recursive generic definition. The type actually has a recursive generic definition, so my question is: why does it work with mono? [The

问题 I've got some C# code that compiles fine under both mono and the Microsoft's .net compilers, but only runs on mono. The error message is (newlines added by me) Unhandled Exception: System.TypeLoadException: Could not load type 'Hasse.Groups.Heavy.Product.PowerGroup`1' from assembly 'Hasse, Version=1.0.x.y, Culture=neutral, PublicKeyToken=null' because it has recursive generic definition. The type actually has a recursive generic definition, so my question is: why does it work with mono? [The

问题 I've been learning about C++ constexpr functions, and I implemented a constexpr recursive function to find the nth fibonacci number. #include <iostream> #include <fstream> #include <cmath> #include <algorithm> #include <vector> constexpr long long fibonacci(int num) { if (num <= 2) return 1; return fibonacci(num - 1) + fibonacci(num - 2); } int main() { auto start = clock(); long long num = fibonacci(70); auto duration = (clock() - start) / (CLOCKS_PER_SEC / 1000.); std::cout << num << "\n" <

问题 I've been learning about C++ constexpr functions, and I implemented a constexpr recursive function to find the nth fibonacci number. #include <iostream> #include <fstream> #include <cmath> #include <algorithm> #include <vector> constexpr long long fibonacci(int num) { if (num <= 2) return 1; return fibonacci(num - 1) + fibonacci(num - 2); } int main() { auto start = clock(); long long num = fibonacci(70); auto duration = (clock() - start) / (CLOCKS_PER_SEC / 1000.); std::cout << num << "\n" <