linked_stack
linked_stack.go 源码
package linked_stack
import (
"errors"
"fmt"
)
//链式栈的实现(基于链表)
type ListNode struct {
next *ListNode
val interface{}
}
type LinkedStack struct {
head *ListNode
size int
}
func NewLinkedStack() *LinkedStack {
return &LinkedStack{
head: nil,
size: 0,
}
}
//压栈
func (stack *LinkedStack) Push(val interface{}) {
node := &ListNode{nil, val}
if stack.Empty() {
stack.head = node
} else {
node.next = stack.head
stack.head = node
}
stack.size++
}
//出栈
func (stack *LinkedStack) Pop() (interface{}, error) {
if stack.Empty() {
return nil, errors.New("stack is empty")
}
result := stack.head.val
stack.head = stack.head.next
stack.size--
return result, nil
}
//获取栈顶元素
func (stack *LinkedStack) Peek() (interface{}, error) {
if stack.Empty() {
return nil, errors.New("stack is empty")
}
return stack.head.val, nil
}
func (stack *LinkedStack) Empty() bool {
return stack.size <= 0
}
func (stack *LinkedStack) Size() int {
return stack.size
}
func (stack *LinkedStack) PrintData() {
if stack.Empty() {
fmt.Println("stack is empty")
} else {
for p := stack.head; p != nil; p = p.next {
fmt.Print(p.val, " ")
}
fmt.Println()
}
}
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