hello-algo/codes/python/chapter_searching/hashing_search.py

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'''
File: hashing_search.py
2022-12-03 22:53:53 +08:00
Created Time: 2022-11-26
Author: timi (xisunyy@163.com)
'''
import sys, os.path as osp
sys.path.append(osp.dirname(osp.dirname(osp.abspath(__file__))))
from include import *
2022-12-03 22:53:53 +08:00
""" 哈希查找(数组) """
def hashing_search(map,target):
# 哈希表的 key: 目标元素value: 索引
# 若哈希表中无此 key ,返回 -1
return map.get(target,-1)
""" 哈希查找(链表) """
def hashing_search1(map,target):
# 哈希表的 key: 目标元素value: 节点对象
# 若哈希表中无此 key ,返回 -1
return map.get(target,-1)
if __name__=='__main__':
target=3
# 哈希查找(数组)
nums=[1, 5, 3, 2, 4, 7, 5, 9, 10, 8]
map=dict() # 初始化哈希表
for i in range(len(nums)):
map[nums[i]]=i # key: 元素value: 索引
index=hashing_search(map,target)
print("目标元素 3 的索引 = " ,index)
# 哈希查找(链表)
head=list_to_linked_list(nums)
map1=dict() # 初始化哈希表
while head:
map1[head.val]=head # key: 结点值value: 结点
head=head.next
node=hashing_search1(map1,target)
print("目标结点值 3 的对应结点对象为 " , node)