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package main import "fmt" type Queue struct { data []interface{} } func (q *Queue) Add(k interface{}) { q.data = append(q.data, k) } func (q *Queue) Pop() interface{} { if len(q.data) == 0 { return nil } v := q.data[0] q.data = q.data[1:] retu

import "fmt" type Stack struct { data []interface{} } func (s *Stack) Push(k interface{}) { s.data = append(s.data, k) } func (s *Stack) Pop() interface{} { if len(s.data) == 0 { return nil } n := len(s.data) - 1 v := s.data[n] s.data = s.data[