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Update docs/chapter_searching/hashing_search.md

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Co-authored-by: Justin Tse <xiefahit@gmail.com>
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@ -173,10 +173,10 @@ comments: true
```typescript title="hashing_search.ts" ```typescript title="hashing_search.ts"
/* 哈希查找（链表） */ /* 哈希查找（链表） */
function hashingSearch1(map: Map<number, any>, target: number) { function hashingSearch1(map: Map<number, ListNode>, target: number): ListNode | null {
// 哈希表的 key: 目标结点值，value: 结点对象 // 哈希表的 key: 目标结点值，value: 结点对象
// 若哈希表中无此 key ，返回 null // 若哈希表中无此 key ，返回 null
return map.has(target) ? map.get(target) : null; return map.has(target) ? map.get(target) as ListNode : null;
} }
``` ```