func (u *UniqueInts) AddValue(v int) {
	if u == nil || *u == nil {
		*u = make(map[int]struct{})
	}
	var emptyStruct struct{}
	(*u)[v] = emptyStruct
}
AddValue to unique list
package helpers
import "sort"
type (
	UniqueInts map[int]struct{}
)