func read_input() {
    parse_args()

    tmpByteArr, _ := (ioutil.ReadFile(inputFile))
    var fileContent = string(tmpByteArr)

    var allTrees []string = strings.Split(fileContent, "\n")

    nTrees = len(allTrees)
    nums = make([][]int, nTrees)

    for i := range nums {
        var oneTree []string = strings.Split(allTrees[i], " ")

        // Numbe of nodes in a tree array = Value at the first index
        nums[i] = make([]int, len(oneTree)+1)
        nums[i][0] = len(oneTree) // Loi ngay dong nay
        for j := 1; j <= len(oneTree); j++ {
            var num int
            num, _ = strconv.Atoi(oneTree[j])
            nums[i] = append(nums[i], num)
        }
    }

    for i := 0; i < nTrees; i++ {
        for j := 1; j <= nums[i][0]; j++ {
            fmt.Print(string(nums[i][j]) + " ")
        }
        fmt.Println()
    }
}