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栈的python代码

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pull/50/head
pengchzn 2 years ago
parent b47f54886e
commit f8d44be73d
3 changed files with 6 additions and 21 deletions
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12
codes/python/chapter_stack_and_queue/array_stack.py
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@ -1,7 +1,7 @@
''' '''
File: array_stack.py File: array_stack.py
Created Time: 2022-11-25 Created Time: 2022-11-29
Author: Krahets (krahets@163.com) Author: Peng Chen (pengchzn@gmail.com)
''' '''
import os.path as osp import os.path as osp
@ -11,43 +11,35 @@ sys.path.append(osp.dirname(osp.dirname(osp.abspath(__file__))))
from include import * from include import *
""" 基于数组实现的栈 """ """ 基于数组实现的栈 """
class ArrayStack: class ArrayStack:
def __init__(self): def __init__(self):
self._stack = [] self._stack = []
self._size = 0 self._size = 0
""" 获取栈的长度 """ """ 获取栈的长度 """
def size(self): def size(self):
return self._size return self._size
""" 判断栈是否为空 """ """ 判断栈是否为空 """
def isEmpty(self): def isEmpty(self):
return self._stack == [] return self._stack == []
""" 入栈 """ """ 入栈 """
def push(self, item): def push(self, item):
self._stack.append(item) self._stack.append(item)
self._size += 1 self._size += 1
""" 出栈 """ """ 出栈 """
def pop(self): def pop(self):
pop = self._stack.pop() pop = self._stack.pop()
self._size -= 1 self._size -= 1
return pop return pop
""" 访问栈顶元素 """ """ 访问栈顶元素 """
def peek(self): def peek(self):
return self._stack[-1] return self._stack[-1]
""" 访问索引 index 处元素 """ """ 访问索引 index 处元素 """
def get(self, index): def get(self, index):
return self._stack[index] return self._stack[index]

11
codes/python/chapter_stack_and_queue/linkedlist_stack.py
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@ -1,7 +1,7 @@
''' '''
File: linkedlist_stack.py File: linkedlist_stack.py
Created Time: 2022-11-25 Created Time: 2022-11-29
Author: Krahets (krahets@163.com) Author: Peng Chen (pengchzn@gmail.com)
''' '''
import os.path as osp import os.path as osp
@ -11,14 +11,11 @@ sys.path.append(osp.dirname(osp.dirname(osp.abspath(__file__))))
from include import * from include import *
""" 基于链表实现的栈 """ """ 基于链表实现的栈 """
class LinkedListStack: class LinkedListStack:
def __init__(self): def __init__(self):
self.head = None self.head = None
""" 获取栈的长度 """ """ 获取栈的长度 """
def size(self): def size(self):
cnt = 0 cnt = 0
temp = self.head temp = self.head
@ -28,28 +25,24 @@ class LinkedListStack:
return cnt return cnt
""" 判断栈是否为空 """ """ 判断栈是否为空 """
def is_empty(self): def is_empty(self):
if not self.head.val and not self.head.next: if not self.head.val and not self.head.next:
return True return True
return False return False
""" 入栈 """ """ 入栈 """
def push(self, val): def push(self, val):
temp = ListNode(val) temp = ListNode(val)
temp.next = self.head temp.next = self.head
self.head = temp self.head = temp
""" 出栈 """ """ 出栈 """
def pop(self): def pop(self):
pop = self.head.val pop = self.head.val
self.head = self.head.next self.head = self.head.next
return pop return pop
""" 访问栈顶元素 """ """ 访问栈顶元素 """
def peek(self): def peek(self):
return self.head.val return self.head.val

4
codes/python/chapter_stack_and_queue/stack.py
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@ -1,7 +1,7 @@
''' '''
File: stack.py File: stack.py
Created Time: 2022-11-25 Created Time: 2022-11-29
Author: Krahets (krahets@163.com) Author: Peng Chen (pengchzn@gmail.com)
''' '''
import os.path as osp import os.path as osp

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