当前位置:首页>PPT>晋升答辩那天,我准备了20页PPT,把过去一年的成就讲得天花乱坠,后来我才发现,晋升名单其实早就在答辩前定好了

晋升答辩那天,我准备了20页PPT,把过去一年的成就讲得天花乱坠,后来我才发现,晋升名单其实早就在答辩前定好了

  • 2026-04-01 14:32:25
晋升答辩那天,我准备了20页PPT,把过去一年的成就讲得天花乱坠,后来我才发现,晋升名单其实早就在答辩前定好了

刚看到个贴子,说有网友去晋升答辩,做了二十页PPT,把一年成绩讲得可精彩了。结果评委就丢来一句:“你在项目里的不可替代性是什么?”他当场哑火。事后才知道,晋升名单早就内定好,答辩只是走流程。

从我的角度看,有两个点:第一,很多公司确实是“先拍板再走程序”,别把流程当成唯一的赛道;第二,“不可替代性”这话虽然听着刺耳,却是提醒——如果离开你,项目照样转得飞快,那你在这家公司就很难有话语权。

不过话说回来,知道游戏有猫腻,不代表你就躺平摆烂。能换环境就换,换不了就想办法让自己在行业里更稀缺一点。

算法题:字母大小写全排列

昨天晚上十一点多吧,我在公司楼下抽烟(别学哈),我们组小李突然微信敲我:东哥,那个“字母大小写全排列”你不是老说很像线上开关么,给个能直接跑的 Python 呗,我明天面试要讲……我当时困得要死,又想起前阵子有个灰度发布,配置里有个 env=prod / env=Prod 这种鬼东西,大小写不统一导致缓存 key 命中率直接掉一截,排查半天才发现就差一个大写 P,你说气不气。

这个题其实就一个意思:给你一串字符串,里面可能有字母也可能有数字,你要把每个字母都当成“有两个形态”的开关——小写/大写,数字就别动,然后把所有组合都吐出来。就像你们做配置中心那种 feature flag,一堆开关乘起来,组合数就指数爆炸,字母有 L 个,就会有 2^L 个结果,跑起来你心里得有数,不然线上一下子搞成生成一百万条字符串,你内存就开始骂街了。

我一般写这种就用回溯,别被“回溯”吓到,就是你走到一个字符,遇到字母就分叉两条路,遇到数字就一条路,走到末尾就收集答案。你把它想成走迷宫,走到岔路口就先走左边,再退回来走右边,反正就是那个……嗯,DFS。你要是喜欢迭代也行,用一个列表当队列,每来一个字母就把现有结果复制一份换大小写,但我更喜欢递归,短,清晰,还不容易写错(当然递归深度太大也会翻车,不过这题字符串一般不长)。

代码我给小李发的就是下面这个,没抄谁的哈,写得比较“能上工位”的那种,还顺手加了个小测试,免得你们说我瞎写。

from typing import Listdefletter_case_permutation(s: str) -> List[str]:"""    字母大小写全排列:    - 字母:可小写/大写    - 数字/其他字符:原样保留(题目一般只有字母数字)    """    chars = list(s)    n = len(chars)    res: List[str] = []    path: List[str] = [''] * n  # 预分配,少点拼接开销defdfs(i: int) -> None:if i == n:            res.append(''.join(path))return        c = chars[i]if'a' <= c <= 'z'or'A' <= c <= 'Z':# 分支1:小写            path[i] = c.lower()            dfs(i + 1)# 分支2:大写            path[i] = c.upper()            dfs(i + 1)else:# 数字等,只有一条路            path[i] = c            dfs(i + 1)    dfs(0)return resif __name__ == "__main__":    print(letter_case_permutation("a1b2"))# 可能输出顺序不同,但集合一样:# ['a1b2', 'a1B2', 'A1b2', 'A1B2']    print(letter_case_permutation("3z4"))# ['3z4', '3Z4']

你看这里有个小细节,path 我没用 path + [x] 这种写法,因为那样每层都新建列表,短字符串无所谓,但你写习惯了,后面做点稍大点的组合题就开始慢得离谱。还有就是判断字母我没用 isalpha(),不是它不行哈,是有些同学字符串里混进中文、下划线啥的,isalpha() 会让你莫名其妙也分叉(当然面试题一般不会这么恶心,但线上数据我可不敢赌)。

然后你讲复杂度的时候别背公式,像聊天一样说:假设有 L 个字母,那就是每个字母两种选法,结果数 2^L,每个结果长度是 n,所以大概就是 2^L * n 这么个量级。面试官点头你就过一半了。哦对,还有个坑,很多人写 BFS 复制列表的时候会把同一个引用改来改去,最后结果全一样,这种错最丢人,你们自己注意哈。

行了我先不说了,刚刚外卖到了,等下我还得回去把那个线上日志滚动策略再改一下,不然磁盘又要爆了……

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  1. CONNECT:[ UseTime:0.000483s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000625s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000314s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000253s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000461s ]
  6. SELECT * FROM `set` [ RunTime:0.000187s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000567s ]
  8. SELECT * FROM `article` WHERE `id` = 473795 LIMIT 1 [ RunTime:0.000395s ]
  9. UPDATE `article` SET `lasttime` = 1775322409 WHERE `id` = 473795 [ RunTime:0.000900s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000283s ]
  11. SELECT * FROM `article` WHERE `id` < 473795 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000461s ]
  12. SELECT * FROM `article` WHERE `id` > 473795 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000433s ]
  13. SELECT * FROM `article` WHERE `id` < 473795 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001732s ]
  14. SELECT * FROM `article` WHERE `id` < 473795 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000688s ]
  15. SELECT * FROM `article` WHERE `id` < 473795 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001202s ]
0.077626s