mirror of
https://github.com/krahets/hello-algo.git
synced 2026-06-28 08:34:28 +00:00
Yudong Jin
46 lines
1.4 KiB
Python
46 lines
1.4 KiB
Python
"""
|
|
File: hashing_search.py
|
|
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 modules import *
|
|
|
|
def hashing_search_array(mapp: dict[int, int], target: int) -> int:
|
|
""" 哈希查找（数组） """
|
|
# 哈希表的 key: 目标元素，value: 索引
|
|
# 若哈希表中无此 key ，返回 -1
|
|
return mapp.get(target, -1)
|
|
|
|
def hashing_search_linkedlist(mapp: dict[int, ListNode], target: int) -> ListNode | None:
|
|
""" 哈希查找（链表） """
|
|
# 哈希表的 key: 目标元素，value: 结点对象
|
|
# 若哈希表中无此 key ，返回 None
|
|
return mapp.get(target, None)
|
|
|
|
|
|
""" Driver Code """
|
|
if __name__ == '__main__':
|
|
target: int = 3
|
|
|
|
# 哈希查找（数组）
|
|
nums: list[int] = [1, 5, 3, 2, 4, 7, 5, 9, 10, 8]
|
|
# 初始化哈希表
|
|
map0 = dict[int, int]()
|
|
for i in range(len(nums)):
|
|
map0[nums[i]] = i # key: 元素，value: 索引
|
|
index: int = hashing_search_array(map0, target)
|
|
print("目标元素 3 的索引 =", index)
|
|
|
|
# 哈希查找（链表）
|
|
head: ListNode = list_to_linked_list(nums)
|
|
# 初始化哈希表
|
|
map1 = dict[int, ListNode]()
|
|
while head:
|
|
map1[head.val] = head # key: 结点值，value: 结点
|
|
head = head.next
|
|
node: ListNode = hashing_search_linkedlist(map1, target)
|
|
print("目标结点值 3 的对应结点对象为", node)
|