GO语言刷题之用两个栈实现一个队列

type CQueue struct {
    stack1,stack2 *list.List
}


func Constructor() CQueue {
    return CQueue{
        //New返回指针类型
        stack1:list.New(),
        stack2:list.New(),
    }
}


func (this *CQueue) AppendTail(value int)  {
    this.stack1.PushBack(value)
}


func (this *CQueue) DeleteHead() int {
    if this.stack2.Len()==0{
        for this.stack1.Len()>0{
            this.stack2.PushBack(this.stack1.Remove(this.stack1.Back()))
        }
    }
    if this.stack2.Len()!=0{
        //返回指针类型
        elem:=this.stack2.Back()
        //按照指针类型删除
        this.stack2.Remove(elem)
        return elem.Value.(int)
    }
    return -1
}


/**
 * Your CQueue object will be instantiated and called as such:
 * obj := Constructor();
 * obj.AppendTail(value);
 * param_2 := obj.DeleteHead();
 */