I'm very new to Golang, I'm trying to do a sudoku with backtracking algorithm. But when I run my program, there are no errors but it only displays the grid not complete, with empty cases here is my code :
package main
import "fmt"
var sudoku = [9][9]int{
{9, 0, 0, 1, 0, 0, 0, 0, 5},
{0, 0, 5, 0, 9, 0, 2, 0, 1},
{8, 0, 0, 0, 4, 0, 0, 0, 0},
{0, 0, 0, 0, 8, 0, 0, 0, 0},
{0, 0, 0, 7, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 2, 6, 0, 0, 9},
{2, 0, 0, 3, 0, 0, 0, 0, 6},
{0, 0, 0, 2, 0, 0, 9, 0, 0},
{0, 0, 1, 9, 0, 4, 5, 7, 0},
}
func main(){
IsValid(sudoku, 0)
Display(sudoku)
}
func Display(sudoku[9][9] int){
var x, y int
for x = 0; x < 9; x++ {
fmt.Println("")
if(x == 3 || x == 6){
fmt.Println(" ")
}
for y = 0; y < 9; y++ {
if(y == 3 || y == 6){
fmt.Print("|")
}
fmt.Print(sudoku[x][y])
}
}
}
func AbsentOnLine(k int, sudoku [9][9]int, x int) bool {
var y int
for y=0; y < 9; y++ {
if (sudoku[x][y] == k){
return false
}
}
return true
}
func AbsentOnRow(k int, sudoku [9][9]int, y int) bool {
var x int
for x=0; x < 9; x++{
if (sudoku[x][y] == k){
return false;
}
}
return true;
}
func AbsentOnBloc(k int, sudoku [9][9]int, x int, y int) bool {
var firstX, firstY int;
firstX = x-(x%3)
firstY = y-(y%3)
for x = firstX; x < firstX+3; x++ {
for y = firstY; y < firstY+3; y++ {
if (sudoku[x][y] == k){
return false;
}
}
}
return true;
}
func IsValid(sudoku [9][9]int, position int) bool {
if (position == 9*9){
return true;
}
var x, y, k int
x = position/9
y = position%9
if (sudoku[x][y] != 0){
return IsValid(sudoku, position+1);
}
for k=1; k <= 9; k++ {
if (AbsentOnLine(k,sudoku,x) && AbsentOnRow(k,sudoku,y) && AbsentOnBloc(k,sudoku,x,y)){
sudoku[x][y] = k;
if (IsValid(sudoku, position+1)){
return true;
}
}
}
sudoku[x][y] = 0;
return false;
}
I'm getting this in the console :
900|100|005
005|090|201
800|040|000
000|080|000
000|700|000
000|026|009
200|300|006
000|200|900
001|904|570
I don't understand why it's not completing the grid, has anyone any ideas ?