mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-28 05:16:28 +08:00
ebf9024136
the chapter of stack and queue, the chapter of tree.
58 lines
1 KiB
Go
58 lines
1 KiB
Go
// File: array_stack.go
|
||
// Created Time: 2022-11-26
|
||
// Author: Reanon (793584285@qq.com)
|
||
|
||
package chapter_stack_and_queue
|
||
|
||
/* 基于数组实现的栈 */
|
||
type ArrayStack struct {
|
||
data []int // 数据
|
||
}
|
||
|
||
func NewArrayStack() *ArrayStack {
|
||
return &ArrayStack{
|
||
// 设置栈的长度为 0,容量为 16
|
||
data: make([]int, 0, 16),
|
||
}
|
||
}
|
||
|
||
// Size 栈的长度
|
||
func (s *ArrayStack) Size() int {
|
||
return len(s.data)
|
||
}
|
||
|
||
// IsEmpty 栈是否为空
|
||
func (s *ArrayStack) IsEmpty() bool {
|
||
return s.Size() == 0
|
||
}
|
||
|
||
// Push 入栈
|
||
func (s *ArrayStack) Push(v int) {
|
||
// 切片会自动扩容
|
||
s.data = append(s.data, v)
|
||
}
|
||
|
||
// Pop 出栈
|
||
func (s *ArrayStack) Pop() any {
|
||
// 弹出栈前,先判断是否为空
|
||
if s.IsEmpty() {
|
||
return nil
|
||
}
|
||
val := s.Peek()
|
||
s.data = s.data[:len(s.data)-1]
|
||
return val
|
||
}
|
||
|
||
// Peek 获取栈顶元素
|
||
func (s *ArrayStack) Peek() any {
|
||
if s.IsEmpty() {
|
||
return nil
|
||
}
|
||
val := s.data[len(s.data)-1]
|
||
return val
|
||
}
|
||
|
||
// 获取 Slice 用于打印
|
||
func (s *ArrayStack) toSlice() []int {
|
||
return s.data
|
||
}
|