mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-27 00:36:28 +08:00
50 lines
1.4 KiB
Python
50 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: 节点对象
|
||
# 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: 节点值，value: 节点
|
||
head = head.next
|
||
node: ListNode = hashing_search_linkedlist(map1, target)
|
||
print("目标节点值 3 的对应节点对象为", node)
|