Python-Basic-Programs/sudoku.py at main · SubuNayak/Python-Basic-Programs · GitHub

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board=[
    [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],
    [4,0,0,8,0,3,0,0,1],
    [7,0,0,0,2,0,0,0,6],
    [0,6,0,0,0,0,2,8,0],
    [0,0,0,4,1,9,0,0,5],
    [0,0,0,0,8,0,0,7,9]]
def print_board(bo):
    for i in range(len(bo)):
        if i%3 == 0 and i!=0:
            print("---------------------")
        for j in range(len(bo[0])):
            if j%3 == 0 and j!=0:
                print(" | ", end ="")
            if j==8:
                print(bo[i][j])
            else:
                print(str(bo[i][j]) + " ",end="")
def find_empty(bo):
    for i in range(len(bo)):
        for j in range(len(bo[0])):
            if bo[i][j] == 0:
                return (i, j)
    return None
def valid(bo, num, pos):
    for i in range(len(bo[0])):#checking row
        if bo[pos[0]][i] == num and pos[1]!= i:
            return False
    for j in range(len(bo)):#checking column
        if bo[i][pos[1]] == num and pos[0]!= i:
            return False
    box_x = pos[1]//3
    box_y = pos[0]//3
    for i in range(box_y*3, box_y*3 + 3):
        for j in range(box_x*3, box_x*3 + 3):
            if bo[i][j] == num and  (i,j) != pos:
                return False
    return True
def solve(bo):
    find = find_empty(bo)
    if not find:
        return True
    else:
        row, col = find
    for i in range(1,10):
        if valid(bo, i , (row,col)):
            bo[row][col] = i
            if solve(bo):
                return True
            bo[row][col]=0
    return False
print_board(board)
solve(board)
print("Solving")
print_board(board)
print("Solved")