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52 lines
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Markdown
Executable File
52 lines
2.0 KiB
Markdown
Executable File
# [706. Design HashMap](https://leetcode.com/problems/design-hashmap/)
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## 题目
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Design a HashMap without using any built-in hash table libraries.
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To be specific, your design should include these functions:
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- `put(key, value)` : Insert a (key, value) pair into the HashMap. If the value already exists in the HashMap, update the value.
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- `get(key)`: Returns the value to which the specified key is mapped, or -1 if this map contains no mapping for the key.
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- `remove(key)` : Remove the mapping for the value key if this map contains the mapping for the key.
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**Example:**
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MyHashMap hashMap = new MyHashMap();
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hashMap.put(1, 1);
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hashMap.put(2, 2);
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hashMap.get(1); // returns 1
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hashMap.get(3); // returns -1 (not found)
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hashMap.put(2, 1); // update the existing value
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hashMap.get(2); // returns 1
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hashMap.remove(2); // remove the mapping for 2
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hashMap.get(2); // returns -1 (not found)
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**Note:**
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- All keys and values will be in the range of `[0, 1000000]`.
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- The number of operations will be in the range of `[1, 10000]`.
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- Please do not use the built-in HashMap library.
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## 题目大意
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不使用任何内建的哈希表库设计一个哈希映射具体地说,你的设计应该包含以下的功能:
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- put(key, value):向哈希映射中插入(键,值)的数值对。如果键对应的值已经存在,更新这个值。
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- get(key):返回给定的键所对应的值,如果映射中不包含这个键,返回 -1。
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- remove(key):如果映射中存在这个键,删除这个数值对。
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注意:
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- 所有的值都在 [1, 1000000] 的范围内。
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- 操作的总数目在 [1, 10000] 范围内。
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- 不要使用内建的哈希库。
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## 解题思路
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- 简单题,设计一个 hashmap 的数据结构,要求有 `put(key, value)`,`get(key)`,`remove(key)`,这 3 个方法。设计一个 map 主要需要处理哈希冲突,一般都是链表法解决冲突。
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