ParallelSudoku

Parallel programming on an SMP and a multicomputer, using OpenMP and MPI, respectively for Parallel and Distributed Computing course. For this purpose, it was developed a serial and two parallel implementations of a sudoku solver.

Description:

For those unaware of this game (e.g., people coming from Mars...), the puzzle consists of a partially filled matrix n × n. The algorithm needs to fill the blank positions with values 1 through n such that no number is repeated on each of the n rows, n columns, or the n squares of √n × √n cells that split the original matrix.

Input:

The programs accept one command line argument which is the name of a file with the Sudoku instance matrix. The format of this file is:

• one line with one integer, l = √n, 2 ≤ l ≤ 9 (specifying l avoids the square root in the code...).
• n lines, each with n integers, separated by a space, with values in the interval [0, n], where 0s represent blank positions in the matrix.

Output:

The program outputs (to the stdout) a matrix in the same format as the input:

• n lines, each with n integers, separated by a space, with values in the interval [1, n].

The non-zero values of the input are kept untouched, no zero values should be present and the matrix should conform with the rules of Sudoku. In case no solution exists, the program prints "No solution".

Contributors:

-Name: 		José Carlos Vieira
-e-mail:	josecarlosvieira@tecnico.ulisboa.pt
-Degree: 	MEEC

-Name: 		Manuel Serra Nunes
-e-mail:	manuelserranunes@tecnico.ulisboa.pt
-Degree: 	MEEC

-Name:		Pedro Esperança do Carmo
-e-mail:	pedro.carmo@tecnico.ulisboa.pt
-Degree:	MEEC

Institution:

-Instituto Superior Técnico, Universidade de Lisboa (2017/2018)