sudoku Questions
7
Solved
Given a unsolved sudoku, how can one show that it has a unique solution?
2
Solved
Suppose I have the following sudoku:
problem <- matrix(c(
5, 3, 0, 0, 7, 0, 0, 0, 0,
6, 0, 0, 1, 9, 5, 0, 0, 0,
0, 9, 8, 0, 0, 0, 0, 6, 0,
8, 0, 0, 0, 6, 0, 0, 0, 3,
4, 0, 0, 8, 0, 3, 0, 0,...
Aby asked 6/9, 2023 at 6:27
16
Solved
How do you generate a Sudoku board with a unique solution? What I thought was to initialize a random board and then remove some numbers. But my question is how do I maintain the uniqueness of a sol...
1
The "simple/naive backtracking brute force algorithm", "Straightforward Depth-First Search" for sudoku is commonly known and implemented.
and no different implementation seems ...
Fearfully asked 10/7, 2014 at 16:41
14
I am trying to create a sudoku checker in python:
ill_formed = [[5,3,4,6,7,8,9,1,2],
[6,7,2,1,9,5,3,4,8],
[1,9,8,3,4,2,5,6,7],
[8,5,9,7,6,1,4,2,3],
[4,2,6,8,5,3,7,9], # <---
[7,1,3,9,2,4,8...
7
I'm trying to write an algorithm that can solve sudoku. For now, my code works till supplyGrid is out of numbers. When it happens it should go back and try another number, right? To be honest I hav...
Melodious asked 11/3, 2017 at 14:58
11
I want to write a code in python to solve a sudoku puzzle. Do you guys have any idea about a good algorithm for this purpose. I read somewhere in net about a algorithm which solves it by filling th...
2
Solved
I'm working on a personal project using opencv in python. Want to detect a sudoku grid.
The original image is:
So far I have created this:
Then tried to select a big blob. Result may be sim...
Alsup asked 24/8, 2019 at 8:42
2
Solved
Two days ago, I was given a sudoku problem that I tried to solve with Python 3. I've been informed that a solution does exist, but I'm not certain if there exists multiple solutions.
The problem i...
Teacup asked 18/3, 2020 at 2:50
6
I am programming a Sudoku solver in Java for a 9x9 grid.
I have methods for:
printing the grid
initializing the board with given values
testing for conflicts (if same number is in same line or 3...
Rutland asked 22/2, 2012 at 23:7
6
Solved
I was doing a fun project: Solving a Sudoku from an input image using OpenCV (as in Google goggles etc). And I have completed the task, but at the end I found a little problem for which I came here...
Howze asked 17/4, 2012 at 17:39
3
Solved
I've been trying for the last few days to get a sudoku grid from a picture, and I have been struggling on getting the smaller squares of the grid.
I am working on the picture below. I thought proce...
Octennial asked 4/12, 2019 at 18:46
2
Solved
I've found here a statement that Algorithm X for sudoku has O(N^3) time complexity where N is a board size.
That's maybe logical, since for sudoku the binary matrix to compute has N^3 rows. But t...
Drysalt asked 14/1, 2019 at 15:39
14
Solved
I have a homework assignment to write a multi-threaded sudoku solver, which finds all solutions to a given puzzle. I have previously written a very fast single-threaded backtracking sudoku solver, ...
Disconnection asked 12/5, 2009 at 2:16
1
This is a problem from Pramp. I need to determine if a sudoku is solvable or not (not like LEETcode question where I just need to see if a board is valid or not).
Below is my code in JavaScript, ...
Juggler asked 22/5, 2019 at 5:25
3
Solved
I'm trying to solve a Sudoku with cvxpy optimization package.
I'm really new to both optimization and cvxpy.
The constraints are:
all the values are between 1 to 9
sum of all rows = 45
sum of...
Salomone asked 13/2, 2019 at 20:49
25
Solved
Does anyone know a simple algorithm to check if a Sudoku-Configuration is valid? The simplest algorithm I came up with is (for a board of size n) in Pseudocode
for each row
for each number k in 1...
2
Solved
I've recently been working on a sudoku game in c++. I've made a graphic version of it using SFML and it works just fine. However, I need to implement an algorithm which will solve the sudoku, whils...
2
Solved
I did go through this.
I don't understand this.
Sudoku is NP-complete when generalized to a n
×
n grid however
a standard 9
×
9
Sudoku is
not
NP-
complete.
Politburo asked 5/6, 2018 at 14:58
9
I'm hoping to optimize my backtracking algorithm for my Sudoku Solver.
What it does now:
The recursive solver function takes a sudoku puzzle with various given values.
I will scour through all...
3
Solved
solveSudoku function is called from main() function.
I have written the following function for solving sudoku :
#include <iostream>
#include <vector>
using namespace std;
int isvalid...
Configurationism asked 18/2, 2017 at 21:11
1
Solved
how is Sudoku an np-complete problem? according to wiki, to be classed as an np-complete problem it must satisfy 2 conditions
problem must be in np
every other problem in np must be reducible to ...
Scow asked 2/11, 2016 at 21:29
1
I transcribed my Java Sudoku solver into python. Everything works, however solving takes up to 2mins, while the identical puzzle takes only a few seconds in Java. Also the iterations needed amount ...
9
Solved
I need one liner (or close to it) that verifies that given array of 9 elements doesn't contain repeating numbers 1,2,3,...,9. Repeating zeroes do not count (they represent empty cells).
The best I...
6
Solved
I'm trying to generate a complete (ie, each cell filled with a number) Sudoku-like board. It's for something else that has nothing to do with sudokus, so I am not interested in reaching a sudoku wi...
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