mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-26 19:46:29 +08:00
52 lines
1.5 KiB
Python
52 lines
1.5 KiB
Python
|
"""
|
|||
|
|
File: hashing_search.py
|
|||
|
|
Created Time: 2022-11-26
|
|||
|
|
Author: timi (xisunyy@163.com)
|
|||
|
|
"""
|
|||
|
|
|
|||
|
|
import sys
|
|||
|
|
from pathlib import Path
|
|||
|
|
|
|||
|
|
sys.path.append(str(Path(__file__).parent.parent))
|
|||
|
|
from modules import ListNode, list_to_linked_list
|
|||
|
|
|
|||
|
|
|
|||
|
|
def hashing_search_array(hmap: dict[int, int], target: int) -> int:
|
|||
|
|
"""雜湊查詢（陣列）"""
|
|||
|
|
# 雜湊表的 key: 目標元素，value: 索引
|
|||
|
|
# 若雜湊表中無此 key ，返回 -1
|
|||
|
|
return hmap.get(target, -1)
|
|||
|
|
|
|||
|
|
|
|||
|
|
def hashing_search_linkedlist(
|
|||
|
|
hmap: dict[int, ListNode], target: int
|
|||
|
|
) -> ListNode | None:
|
|||
|
|
"""雜湊查詢（鏈結串列）"""
|
|||
|
|
# 雜湊表的 key: 目標元素，value: 節點物件
|
|||
|
|
# 若雜湊表中無此 key ，返回 None
|
|||
|
|
return hmap.get(target, None)
|
|||
|
|
|
|||
|
|
|
|||
|
|
"""Driver Code"""
|
|||
|
|
if __name__ == "__main__":
|
|||
|
|
target = 3
|
|||
|
|
|
|||
|
|
# 雜湊查詢（陣列）
|
|||
|
|
nums = [1, 5, 3, 2, 4, 7, 5, 9, 10, 8]
|
|||
|
|
# 初始化雜湊表
|
|||
|
|
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("目標元素 3 的索引 =", index)
|
|||
|
|
|
|||
|
|
# 雜湊查詢（鏈結串列）
|
|||
|
|
head: ListNode = list_to_linked_list(nums)
|
|||
|
|
# 初始化雜湊表
|
|||
|
|
map1 = dict[int, ListNode]()
|
|||
|
|
while head:
|
|||
|
|
map1[head.val] = head # key: 節點值，value: 節點
|
|||
|
|
head = head.next
|
|||
|
|
node: ListNode = hashing_search_linkedlist(map1, target)
|
|||
|
|
print("目標節點值 3 的對應節點物件為", node)
|