package main

import "fmt"

func main() {

	intslice := [][]int{[]int{1}, []int{2}}

	// Grow
	for index, value := range intslice {
		value = append(value, 0)
		intslice[index] = value
	}

	insertion := []int{}
	for index := 0; index < len(intslice)+1; index++ {
		insertion = append(insertion, 0)

	}
	intslice = append(intslice, insertion)
	fmt.Println(intslice)

	// Shrink
	for index, value := range intslice {
		if len(value) == 0 {
			fmt.Println("Cant shrink below 0")
			continue
		}

		value = value[:len(value)-1]
		intslice[index] = value

		if index == len(intslice)-1 {
			intslice = intslice[:len(intslice)-1]

		}

	}

	fmt.Println(intslice)
}