type array [][]int

func (a array) Len() int           { return len(a) }
func (a array) Less(i, j int) bool { return a[i][0] < a[j][0] }
func (a array) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }

type none struct{}

func smallestRange(nums [][]int) []int {
	var a array
	set := make(map[int]none)
	for i := range nums {
		for _, num := range nums[i] {
			a = append(a, []int{num, i})
		}
	}
	sort.Sort(a)
	l, r, k, n := 0, -1, len(nums), len(a)
	min := math.MaxInt32
	res := make([]int, 2)
	for r < n {
		for len(set) != k {
			r++
			
		}
	}
}