mirror of
https://github.com/krahets/hello-algo.git
synced 2025-11-04 06:07:20 +08:00
46 lines
1.3 KiB
Python
46 lines
1.3 KiB
Python
"""
|
|
File: linear_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 linear_search_array(nums: list[int], target: int) -> int:
|
|
"""线性查找（数组）"""
|
|
# 遍历数组
|
|
for i in range(len(nums)):
|
|
if nums[i] == target: # 找到目标元素，返回其索引
|
|
return i
|
|
return -1 # 未找到目标元素，返回 -1
|
|
|
|
|
|
def linear_search_linkedlist(head: ListNode, target: int) -> ListNode | None:
|
|
"""线性查找（链表）"""
|
|
# 遍历链表
|
|
while head:
|
|
if head.val == target: # 找到目标节点，返回之
|
|
return head
|
|
head = head.next
|
|
return None # 未找到目标节点，返回 None
|
|
|
|
|
|
"""Driver Code"""
|
|
if __name__ == "__main__":
|
|
target = 3
|
|
|
|
# 在数组中执行线性查找
|
|
nums = [1, 5, 3, 2, 4, 7, 5, 9, 10, 8]
|
|
index: int = linear_search_array(nums, target)
|
|
print("目标元素 3 的索引 =", index)
|
|
|
|
# 在链表中执行线性查找
|
|
head: ListNode = list_to_linked_list(nums)
|
|
node: ListNode | None = linear_search_linkedlist(head, target)
|
|
print("目标节点值 3 的对应节点对象为", node)
|