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"""
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File: hashing_search.py
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Created Time: 2022-11-26
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Author: timi (xisunyy@163.com)
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"""
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import sys
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from pathlib import Path
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sys.path.append(str(Path(__file__).parent.parent))
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from modules import ListNode, list_to_linked_list
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def hashing_search_array(hmap: dict[int, int], target: int) -> int:
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"""哈希查找（数组）"""
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# 哈希表的 key: 目标元素，value: 索引
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# 若哈希表中无此 key ，返回 -1
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return hmap.get(target, -1)
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def hashing_search_linkedlist(
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hmap: dict[int, ListNode], target: int
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) -> ListNode | None:
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"""哈希查找（链表）"""
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# 哈希表的 key: 目标元素，value: 节点对象
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# 若哈希表中无此 key ，返回 None
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return hmap.get(target, None)
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"""Driver Code"""
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if __name__ == "__main__":
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target = 3
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# 哈希查找（数组）
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nums = [1, 5, 3, 2, 4, 7, 5, 9, 10, 8]
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# 初始化哈希表
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map0 = dict[int, int]()
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for i in range(len(nums)):
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map0[nums[i]] = i # key: 元素，value: 索引
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index: int = hashing_search_array(map0, target)
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print("目标元素 3 的索引 =", index)
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# 哈希查找（链表）
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head: ListNode = list_to_linked_list(nums)
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# 初始化哈希表
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map1 = dict[int, ListNode]()
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while head:
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map1[head.val] = head # key: 节点值，value: 节点
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head = head.next
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node: ListNode = hashing_search_linkedlist(map1, target)
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print("目标节点值 3 的对应节点对象为", node)
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