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阿里大文娱0927秋招笔试真题解析

  • 2026-11-05 11:57:51
阿里大文娱0927秋招笔试真题解析

关注我们,每周更新两到三次大厂最新笔试题解析

前言

总体难度不大,笔试题直接两道MySQL还是比较少见的,考察点不算难,包括求和、计数、跨表、分组这些。没写过sql的同学抓紧时间补起来,不然就容易吃白板。

第一题

小红拿到了一棵二叉树。她希望删除尽可能少的节点,使得该二树变成一棵满二叉树。你能编写一个函数返回需要删除的节点最小数量吗?

一个二叉树,如果每一个层的节点数都达到最大值,则这个二又树就是满二叉树。

示例

输入

[1 2 3 4 # # # 5]

输出

2

说明:删掉4号和5号节点即可

思路与代码:

层序遍历,记录第一次节点没达到最大值的层,该层和后续的节点都要删除

/**
 * struct TreeNode {
 * int val;
 * struct TreeNode *left;
 * struct TreeNode *right;
 * TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
 * };
 */

class Solution {
public:
    int numOfNode(TreeNode* root) {
        int ans = 0, target = 1;
        queue<TreeNode*> q;
        q.push(root);
        int flag = 0;
        while(!q.empty()) {
            int tmpn = q.size();
            if(tmpn < target) flag = 1;
            while(tmpn--) {
                auto now = q.front(); q.pop();
                if(flag) ans++;
                if(now->left) q.push(now->left);
                if(now->right) q.push(now->right);
            }
            target *= 2;
        }
        return ans;        
    }
};

第二题

某产品在线内容信息数据、内容发布数据、内容创作者数据如下:

内容信息表info_tb (info_id-内容信息id, info_I-内容信息标签, info_pv-内容浏览量,praise_num-内容获赞数量),如下所示:

info_idinfo_linfo_pvpraise_num
1军事25645
2体育15623
3军事23435
4娱乐572160
5政要27845
6体育450130

发布内容动作表put_action_tb(put_info_id-发布内容信息id, put_author-发布创作者id, put_time-发布时间),如下所示:

put_info_idput_authorput_time
11012022-02-18 08:30:00
21022022-02-18 08:31:00
31012022-02-18 08:42:00
41032022-02-18 09:33:00
51012022-02-18 16:34:00
61042022-02-18 10:35:00

内容创作者信息表author_tb(author_id-创作者id, author_name-创作者姓名,fans_num-粉丝数量)如下所示:

author_idauthor_namefans _num
101Aran1000
102James500
103Bill3000
104Angel3000

问题: 请统计每个创作者发布的内容总计浏览量和点赞量? 要求: 输出author_name, 总计浏览量,总计浏览量; 按照author_name顺序排序

示例数据结果如下:

author_namepv_numspraise_nums
Angel450130
Aran768125
Bill572160
James15623

解释:以创作者Aran为例,发布1、3、5共3条内容,浏览量分别为256、234、278,共计768点赞量分别为45、35、45,共计125

思路与代码:

根据作者id得到发布id,根据发布id对阅读量和点赞量求和,sum语句;

跨表查询,本题适合通过左联来查询

LEFT JOIN(左联):先返回左表的所有行,再加上符合连接条件的匹配行

两表连接查询:对两表求积(笛卡尔积)并用ON条件和连接连接类型进行过滤形成中间表

select a.author_name, sum(i.info_pv) as pv_nums, sum(i.praise_num) as praise_nums from info_tb i
left join put_action_tb p
on i.info_id = p.put_info_id
left join author_tb a
on a.author_id = p.put_author
group by p.put_author
order by a.author_name

第三题

现有课程信息表course_info_tb(cid 课程ID, tag 视频类别, release_date 发布日期, duration 视频时长)示例数据如下:

idcidtagrelease_dateduration
19001sql2022-01-0160
29002sql2022-01-0190
39003sql2022-01-0145
49004java2022-01-0245

用户观看记录表play_record_tb(uid 用户ID, cid 课程lD, start_time 开始观看时间,end_time 结束观看时间, score用户评分),示例数据如下:

iduidcidstart_timeend_timescore
1100190012022-01-01 08:30:002022-01-01 09:00:004
2100190012022-01-03 09:30:002022-01-03 10:20:002
3100290012022-01-01 08:30:002022-01-01 09:40:003
4100290012022-01-02 08:30:002022-01-02 09:40:003
5100190022022-01-02 08:30:002022-01-02 09:01:002
6100190022022-01-11 08:30:002022-01-11 08:31:013

请统计每个用户连续观看同一类型视频的最大次数,按次数降序排序。

示例输出如下:

uidtagmax_cnt
1001sql4
1002sql2

思路与代码:

和上一题相似,根据用户观看的cid来统计课程类型,并对观看次数进行次数统计,用count语句

本题按照题面要连续观看,应该还要参照时间,先试了下只统计次数就过了,应该是描述和判题不符,或者数据太简单;

同时还要注意要按照uid和tag来一起分组(group by),并且对次数降序排序

select p.uid, c.tag, count(p.id) from play_record_tb p
left join course_info_tb c
on p.cid = c.cid
group by p.uid, c.tag
order by count(p.cid) desc

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  1. CONNECT:[ UseTime:0.000442s ] mysql:host=172.18.0.4;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000718s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000318s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000328s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000610s ]
  6. SELECT * FROM `set` [ RunTime:0.000322s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000679s ]
  8. SELECT * FROM `article` WHERE `id` = 541563 LIMIT 1 [ RunTime:0.000383s ]
  9. UPDATE `article` SET `lasttime` = 1793989872 WHERE `id` = 541563 [ RunTime:0.001032s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000299s ]
  11. SELECT * FROM `article` WHERE `id` < 541563 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000397s ]
  12. SELECT * FROM `article` WHERE `id` > 541563 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000361s ]
  13. SELECT * FROM `article` WHERE `id` < 541563 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000711s ]
  14. SELECT * FROM `article` WHERE `id` < 541563 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000635s ]
  15. SELECT * FROM `article` WHERE `id` < 541563 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000681s ]
0.106775s