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import gradio as gr

def print_board(tablero):
    output = ""
    for i in range(len(tablero)):
        for j in range(len(tablero[0])):
            if j == 8:
                output += str(tablero[i][j]) + "\n"
            else:
                output += str(tablero[i][j]) + "   "
    return output

def resolver(tablero):
    buscar = buscar_vacio(tablero)
    if not buscar:
        return True
    else:
        fila, columna = buscar

    for i in range(1,10):
        if es_valido(tablero, i, (fila, columna)):
            tablero[fila][columna] = i

            if resolver(tablero):
                return True

            tablero[fila][columna] = 0

    return False

def es_valido(tablero, num, pos):
    # Comprobar fila
    for i in range(len(tablero[0])):
        if tablero[pos[0]][i] == num and pos[1] != i:
            return False

    # Comprobar columna
    for i in range(len(tablero)):
        if tablero[i][pos[1]] == num and pos[0] != i:
            return False

    # Comprobar cuadrado
    caja_x = pos[1] // 3
    caja_y = pos[0] // 3

    for i in range(caja_y*3, caja_y*3 + 3):
        for j in range(caja_x * 3, caja_x*3 + 3):
            if tablero[i][j] == num and (i,j) != pos:
                return False

    return True

def buscar_vacio(tablero):
    for i in range(len(tablero)):
        for j in range(len(tablero[0])):
            if tablero[i][j] == 0:
                return (i, j) # fila, columna

    return None

def function(cadena):

    tablero = []
    for i in range(0, 81, 9):
        row = [int(num) for num in cadena[i:i+9]]
        tablero.append(row)
    
    resolver(tablero)
    
    return print_board(tablero)

value1 = gr.Textbox(lines=2, label="Sudoku", placeholder="Ingrese la cadena del sudoku")
value2 = gr.Textbox(lines=10, label="Solución", placeholder="Solución...")

examples=[
    ["400030000000600800000000001000050090080000600070200000000102700503000040900000000"],
    ["708000300000201000500000000040000026300080000000100090090600004000070500000000000"],
    ["708000300000601000500000000040000026300080000000100090090200004000070500000000000"],    
    ["307040000000000091800000000400000700000160000000250000000000380090000500020600000"],
    ["500700600003800000000000200620400000000000091700000000000035080400000100000090000"],
    ["400700600003800000000000200620500000000000091700000000000043080500000100000090000"],    
    ["040010200000009070010000000000430600800000050000200000705008000000600300900000000"],
    ["705000002000401000300000000010600400200050000000000090000370000080000600090000080"],
    ["000000410900300000300050000048007000000000062010000000600200005070000800000090000"],
    ["780400120600075009000601078007040260001050930904060005070300012120007400049206007"]]

demo = gr.Interface(
    fn=function,
    inputs=value1,
    outputs=value2,
    title="Resolver Sudoku",
    examples=examples,
    description="Resuelve un Sudoku a partir de una cadena"
)

demo.launch(debug=True)