127.0.0.1:9200<br>URL: http://127.0.0.1:9200/likecs_art_db/_search<br>REQUEST:<pre>Array
(
    [query] => Array
        (
            [match] => Array
                (
                    [text] => Array
                        (
                            [query] => LeetCode380 常数时间插入、删除和获取随机元素
                        )

                )

        )

    [highlight] => Array
        (
            [fields] => Array
                (
                    [text] => stdClass Object
                        (
                        )

                )

            [pre_tags] => #em#
            [post_tags] => #/em#
        )

    [size] => 8
    [from] => 0
)
</pre>RESPONSE:<pre>string(8700) "{"took":50,"timed_out":false,"_shards":{"total":1,"successful":1,"skipped":0,"failed":0},"hits":{"total":{"value":10000,"relation":"gte"},"max_score":66.957565,"hits":[{"_index":"likecs_art_db","_type":"_doc","_id":"72733","_score":66.957565,"_source":{"id":"72733","text":"LeetCode380 \u5e38\u6570\u65f6\u95f4\u63d2\u5165\u3001\u5220\u9664\u548c\u83b7\u53d6\u968f\u673a\u5143\u7d20","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        ","username":"leyang2019","tagsname":"","tagsid":"[]","catesname":"","catesid":"[]","createtime":"1567917663"},"highlight":{"text":["#em#LeetCode380#/em# #em#常#/em##em#数#/em##em#时#/em##em#间#/em##em#插#/em##em#入#/em#、#em#删#/em##em#除#/em##em#和#/em##em#获#/em##em#取#/em##em#随#/em##em#机#/em##em#元#/em##em#素#/em#"]}},{"_index":"likecs_art_db","_type":"_doc","_id":"91471","_score":44.343796,"_source":{"id":"91471","text":"LeetCode 380. Insert Delete GetRandom O(1) \u5e38\u6570\u65f6\u95f4\u63d2\u5165\u3001\u5220\u9664\u548c\u83b7\u53d6\u968f\u673a\u5143\u7d20(C++\/Java) ","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        ","username":"silentteller","tagsname":"","tagsid":"[]","catesname":"","catesid":"[]","createtime":"1580452469"},"highlight":{"text":["Insert Delete GetRandom O(1) #em#常#/em##em#数#/em##em#时#/em##em#间#/em##em#插#/em##em#入#/em#、#em#删#/em##em#除#/em##em#和#/em##em#获#/em##em#取#/em##em#随#/em##em#机#/em##em#元#/em##em#素#/em#(C++/Java)"]}},{"_index":"likecs_art_db","_type":"_doc","_id":"110984","_score":38.57324,"_source":{"id":"110984","text":"LeetCode \u54c8\u5e0c\u8868 380. \u5e38\u6570\u65f6\u95f4\u63d2\u5165\u3001\u5220\u9664\u548c\u83b7\u53d6\u968f\u673a\u5143\u7d20\uff08\u8bbe\u8ba1\u6570\u636e\u7ed3\u6784 List HashMap\u5e95\u5c42 \u65f6\u95f4\u590d\u6742\u5ea6\uff09","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        ","username":"take-it-easy","tagsname":"","tagsid":"[]","catesname":"","catesid":"[]","createtime":"1594041548"},"highlight":{"text":["#em#常#/em##em#数#/em##em#时#/em##em#间#/em##em#插#/em##em#入#/em#、#em#删#/em##em#除#/em##em#和#/em##em#获#/em##em#取#/em##em#随#/em##em#机#/em##em#元#/em##em#素#/em#（设计#em#数#/em#据结构 List HashMap底层 #em#时#/em##em#间#/em#复杂度）"]}},{"_index":"likecs_art_db","_type":"_doc","_id":"998048","_score":36.360504,"_source":{"id":"998048","text":"JQuery \u6570\u7ec4\u83b7\u53d6\u548c\u5220\u9664\u5143\u7d20","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        ","username":"lick468","tagsname":"","tagsid":"","catesname":null,"catesid":"","createtime":"1640455969"},"highlight":{"text":["JQuery #em#数#/em#组#em#获#/em##em#取#/em##em#和#/em##em#删#/em##em#除#/em##em#元#/em##em#素#/em#"]}},{"_index":"likecs_art_db","_type":"_doc","_id":"92224","_score":35.03254,"_source":{"id":"92224","text":"LeetCode 381. Insert Delete GetRandom O(1) - Duplicates allowed O(1) \u65f6\u95f4\u63d2\u5165\u3001\u5220\u9664\u548c\u83b7\u53d6\u968f\u673a\u5143\u7d20 - \u5141\u8bb8\u91cd\u590d(C++\/Java)","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        ","username":"silentteller","tagsname":"","tagsid":"[]","catesname":"","catesid":"[]","createtime":"1581170237"},"highlight":{"text":["Insert Delete GetRandom O(1) - Duplicates allowed O(1) #em#时#/em##em#间#/em##em#插#/em##em#入#/em#、#em#删#/em##em#除#/em##em#和#/em##em#获#/em##em#取#/em##em#随#/em##em#机#/em##em#元#/em##em#素#/em# - 允许重复(C++/Java)"]}},{"_index":"likecs_art_db","_type":"_doc","_id":"203339990","_score":33.490734,"_source":{"id":"203339990","text":"JavaScript - \u968f\u673a\u83b7\u53d6\u6570\u7ec4\u5143\u7d20","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        ","username":"","tagsname":null,"tagsid":"","catesname":null,"catesid":"","createtime":"1636556997"},"highlight":{"text":["JavaScript - #em#随#/em##em#机#/em##em#获#/em##em#取#/em##em#数#/em#组#em#元#/em##em#素#/em#"]}},{"_index":"likecs_art_db","_type":"_doc","_id":"352721","_score":31.130217,"_source":{"id":"352721","text":"jq\u6dfb\u52a0\u63d2\u5165\u5220\u9664\u5143\u7d20","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        ","username":"sandraryan","tagsname":"","tagsid":"","catesname":null,"catesid":"","createtime":"1632029451"},"highlight":{"text":["jq添加#em#插#/em##em#入#/em##em#删#/em##em#除#/em##em#元#/em##em#素#/em#"]}},{"_index":"likecs_art_db","_type":"_doc","_id":"336917","_score":30.13519,"_source":{"id":"336917","text":"\u5806\u64cd\u4f5c\uff081\uff09-\u5806\u4e2d\u63d2\u5165\u5143\u7d20\uff0c\u5220\u9664\u5143\u7d20","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        ","username":"Brake","tagsname":null,"tagsid":"","catesname":"","catesid":"","createtime":"1631850086"},"highlight":{"text":["堆操作（1）-堆中#em#插#/em##em#入#/em##em#元#/em##em#素#/em#，#em#删#/em##em#除#/em##em#元#/em##em#素#/em#"]}}]}}"
</pre>127.0.0.1:9200<br>URL: http://127.0.0.1:9200/likecs_art_db/_search<br>REQUEST:<pre>Array
(
    [query] => Array
        (
            [match] => Array
                (
                    [text] => Array
                        (
                            [query] => LeetCode380 常数时间插入、删除和获取随机元素
                        )

                )

        )

    [highlight] => Array
        (
            [fields] => Array
                (
                    [text] => stdClass Object
                        (
                        )

                )

            [pre_tags] => #em#
            [post_tags] => #/em#
        )

    [size] => 8
    [from] => 8
)
</pre>RESPONSE:<pre>string(7938) "{"took":60,"timed_out":false,"_shards":{"total":1,"successful":1,"skipped":0,"failed":0},"hits":{"total":{"value":10000,"relation":"gte"},"max_score":66.957565,"hits":[{"_index":"likecs_art_db","_type":"_doc","_id":"870656","_score":29.367182,"_source":{"id":"870656","text":"jquery\u83b7\u53d6\u5143\u7d20\u548cDOM\u83b7\u53d6\u5143\u7d20","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        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</pre>127.0.0.1:9200<br>URL: http://192.168.101.128/searchcore/index.php/cihere_cn_db/_search<br>REQUEST:<pre>Array
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</pre>127.0.0.1:9200<br>URL: http://127.0.0.1:9200/likecs_down_db/_search<br>REQUEST:<pre>Array
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                        <h1 class="page-title"><a href="/show-72733.html" title="LeetCode380 常数时间插入、删除和获取随机元素">LeetCode380 常数时间插入、删除和获取随机元素</a></h1>
            
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<a id="cb_post_title_url" class="postTitle2" href="/default/index/url?u=aHR0cHM6Ly93d3cuY25ibG9ncy5jb20vbGV5YW5nMjAxOS9wLzExNDg1MTkxLmh0bWw=" target="_blank">LeetCode380 常数时间插入、删除和获取随机元素</a>

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<div id="likecs_post_body" class="blogpost-body cnblogs-markdown">
    <h2 id="leetcode380-常数时间插入删除和获取随机元素">LeetCode380 常数时间插入、删除和获取随机元素</h2>
<h3 id="题目要求">题目要求</h3>
<blockquote>
<p>设计一个支持在平均 时间复杂度 O(1) 下，执行以下操作的数据结构。<br>
insert(val)：当元素 val 不存在时，向集合中插入该项。<br>
remove(val)：元素 val 存在时，从集合中移除该项。<br>
getRandom：随机返回现有集合中的一项。每个元素应该有相同的概率被返回。<br>
示例 :</p>
</blockquote>
<pre class="cpp"><code>
// 初始化一个空的集合。
RandomizedSet randomSet = new RandomizedSet();

// 向集合中插入 1 。返回 true 表示 1 被成功地插入。
randomSet.insert(1);

// 返回 false ，表示集合中不存在 2 。
randomSet.remove(2);

// 向集合中插入 2 。返回 true 。集合现在包含 [1,2] 。
randomSet.insert(2);

// getRandom 应随机返回 1 或 2 。
randomSet.getRandom();

// 从集合中移除 1 ，返回 true 。集合现在包含 [2] 。
randomSet.remove(1);

// 2 已在集合中，所以返回 false 。
randomSet.insert(2);

// 由于 2 是集合中唯一的数字，getRandom 总是返回 2 。
randomSet.getRandom();</code></pre>
<h3 id="分析">分析：</h3>
<p>查找最快的数据结构为列表或者hash表，分别按照角标或者内容查找。<br>
删除元素hash表时间复杂度为常数时间，但是列表则为线性时间，本题需要做特殊处理，对于要删除的元素采用交换到末尾的策略，然后删除末尾元素再更新对应的hash表。</p>
<p><img src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTlwYldjeU1ERTRMbU51WW14dlozTXVZMjl0TDJKc2IyY3ZNVFl3T1RnM09TOHlNREU1TURrdk1UWXdPVGczT1MweU1ERTVNRGt3T0RFeU5EQXlOamM0TlMwNU5URXdNVFE1TXpVdWNHNW4="></p>
<h3 id="代码">代码：</h3>
<pre class="cpp"><code>class RandomizedSet {
public:
    /** Initialize your data structure here. */
    RandomizedSet() {
        
    }
    
    /** Inserts a value to the set. Returns true if the set did not already contain the specified element. */
    bool insert(int val) {
        if(hashMap.find(val) != hashMap.end()) {
            return false;
        }
        vec.push_back(val);
        hashMap[val] = vec.size()-1;
        return true;
    }
    
    /** Removes a value from the set. Returns true if the set contained the specified element. */
    bool remove(int val) {
        if(hashMap.find(val) == hashMap.end()) {
            return false;
        }
        int index = hashMap.find(val) -&gt; second;
        if(index == vec.size() - 1) {
            vec.pop_back();
            hashMap.erase(val);
        }else {
            hashMap[vec[vec.size()-1]] = index;
            swap(vec[index], vec[vec.size() - 1]);
            vec.pop_back();
            hashMap.erase(val);
        }
        return true;
    }
    
    /** Get a random element from the set. */
    int getRandom() {
        if(!vec.size()) {
            return -1;
        }
        int index = rand() % vec.size();
        return vec[index];
    }
    
private:
    unordered_map&lt;int, int&gt; hashMap;
    vector&lt;int&gt; vec;
};

/**
 * Your RandomizedSet object will be instantiated and called as such:
 * RandomizedSet* obj = new RandomizedSet();
 * bool param_1 = obj-&gt;insert(val);
 * bool param_2 = obj-&gt;remove(val);
 * int param_3 = obj-&gt;getRandom();
 */</code></pre>

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