valid_sudoku.go

func isValidSudoku(board [][]byte) bool {
    var colV [9][9]int
    var rowV [9][9]int
    var boxV [9][9]int

    for row := 0; row < 9; row++ {
        for col := 0; col < 9; col++ {
            value := board[row][col] - '0'
            if value > 0 && value <= 9 {
                if rowV[row][value-1] != 0 || colV[col][value-1] != 0 {
                    return false
                }
                key := ((row/3)*3) + (col/3)
                if boxV[key][value-1] != 0 {
                    return false
                }
                rowV[row][value-1] = 1
                colV[col][value-1] = 1
                boxV[key][value-1] = 1
            }
        }
    } 
    return true
}