sample.sudoku のソースコード

# -*- coding: utf-8 -*-

def showsudoku(Rows, Cols, Vals, table):
    from sys import stdout

    for r, in Rows:
        if r in (1, 4, 7):
            stdout.write("+-------+-------+-------+\n")
        for c, in Cols:
            for v, in Vals:
                if table[v,r,c] == 1:
                    break
            else:
                v = ' '
            if c in (1, 4, 7):
                stdout.write("| ")
            stdout.write(str(v) + " ")
        stdout.write("|\n")
    stdout.write("+-------+-------+-------+\n")

def sudoku(**kwds):
    """数独"""
    from pysimple import Problem, Set, Element, BinaryVariable, Sum, Parameter

    Vals = Rows = Cols = Set(value=range(1, 10))
    v = Element(set=Vals)
    r = Element(set=Rows)
    c = Element(set=Cols)
    Blocks = Set(value=[(s+1, s//3*3+t//3+1, s%3*3+t%3+1) for s in range(9) for t in range(9)])
    b = Element(set=Blocks)  # b(0) は Block 番号
    print(Blocks)

    Init = Set(value=[(5, 1, 1), (6, 2, 1), (8, 4, 1), (4, 5, 1), (7, 6, 1), (3, 1, 2), (9, 3, 2), (6, 7, 2), (8, 3, 3), (1, 2, 4), (8, 5, 4), (4, 8, 4), (7, 1, 5), (9, 2, 5), (6, 4, 5), (2, 6, 5), (1, 8, 5), (8, 9, 5), (5, 2, 6), (3, 5, 6), (9, 8, 6), (2, 7, 7), (6, 3, 8), (8, 7, 8), (7, 9, 8), (3, 4, 9), (1, 5, 9), (6, 6, 9), (5, 8, 9), (9, 9, 9)])
    init = Element(set=Init)

    prob = Problem(name='数独')
    x = BinaryVariable(index=(v,r,c))  # 値 v が (r,c) に入るか

    prob += Sum(x[v,r,c], v) == 1          # 各マスにはいずれかの値
    prob += Sum(x[v,r,c], r) == 1          # 各値は各列のいずれか
    prob += Sum(x[v,r,c], c) == 1          # 各値は各行のいずれか
    prob += Sum(x[v,b(1,2)], b(1,2)) == 1  # 各値は各ブロックのいずれか
    prob += x[init] == 1                   # 初期条件

    print(prob)
    prob.solve(**kwds)

    print(x[x[v,r,c].val==1])

    inittable = Parameter(index=(v,r,c), value=dict.fromkeys(Init, 1))
    resulttable = dict(x.val.items())  # dump as dict
    showsudoku(Rows, Cols, Vals, inittable)
    showsudoku(Rows, Cols, Vals, resulttable)

if __name__ == '__main__':
    from sys import argv
    from . import sudoku as sudoku_

    if argv[1:]:
        for arg in argv[1:]:
            getattr(sudoku_, arg)()
    else:
        sudoku()