Problem 58458. You are given a matrix A of size m x n representing a Sudoku puzzle. The matrix contains digits from 1 to 9, where 0 represents an empty cell. Your task is to solve the Sudoku puzzle by filling in the empty cells with the correct digits.

The provided code implements a solution for solving Sudoku puzzles using a recursive backtracking algorithm.
Sudoku is a logic-based number puzzle where the goal is to fill a 9x9 grid with digits from 1 to 9, following specific rules. The grid is divided into 9 sub-grids of size 3x3, and each cell must be filled with a digit such that the following conditions are satisfied:
1. Each row must contain all digits from 1 to 9 without repetition.
2. Each column must contain all digits from 1 to 9 without repetition.
3. Each 3x3 sub-grid must contain all digits from 1 to 9 without repetition.
Write a function solve_sudoku(A) that takes the matrix A as input and returns the solved Sudoku puzzle as the output. If a solution is not possible, the function should return an empty matrix.
Solve

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Last Solution submitted on Dec 19, 2023

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