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package index
type Skiplist struct {	store map[int]int}
func Constructor() Skiplist {	return Skiplist{store: make(map[int]int)}}
func (s *Skiplist) Search(target int) bool {	var v, ok = s.store[target]	return ok && v > 0}
func (s *Skiplist) Add(target int) {	s.store[target]++}
func (s *Skiplist) Erase(target int) bool {	var v, ok = s.store[target]	if ok && v > 0 {		if v == 1 {			delete(s.store, target)			return true		}		s.store[target]--
		return true	} else {		return false	}}