当前位置:首页>Linux>面了个28K的候选人,简历写精通Linux/Shell.我让他现场写个命令:乡统计Nginx日志里访问量Top10的IP.憋了半天写了个cat',然后就没有了

面了个28K的候选人,简历写精通Linux/Shell.我让他现场写个命令:乡统计Nginx日志里访问量Top10的IP.憋了半天写了个cat',然后就没有了

  • 2026-02-06 02:34:36
面了个28K的候选人,简历写精通Linux/Shell.我让他现场写个命令:乡统计Nginx日志里访问量Top10的IP.憋了半天写了个cat',然后就没有了

刚看到个贴子,说有网友面试一个开口就要28K的程序员。简历上写着“精通Linux/Shell”,结果面试官让他现场写个统计Nginx日志里访问量Top10 IP的命令,他憋半天只敲出来个cat,后面啥也写不出来。

网友们的回帖我看了看,有笑他是“会cd就叫精通”的,也有替他说话的,说现场紧张、命令记不住很正常,还有人吐槽现在面试爱出偏题、故意为难人。

我觉得这事吧,问题关键不在那一道命令,而在“价码”和“实力”能不能对得上。你要价28K,那起码得把常用工具链练成肌肉记忆,否则就是拿高配置的价,干入门级的活。另一方面,面试官也别太得意,真正在公司干活,不是背命令,是解决问题。

说到底还是:标注能力别虚高,要价之前先看看自己值不值这个数,踏实学点真本事,比什么花哨词儿都硬。

算法题:整数转罗马数字

那天晚上十一点多,我在工位那边磨叽着刷题,旁边小伙子突然来一句:哥,这个“整数转罗马数字”什么鬼啊,看着简单写出来一堆 bug。正好我也困得不行,就一边喝口凉掉的咖啡,一边给他用 Rust 把这个算发…算法过了一遍。

先说下罗马数字是啥意思哈,别一上来就写代码。罗马数字只有几个符号: I=1,V=5,X=10,L=50,C=100,D=500,M=1000。 但它还有点“减法规则”: 比如 4 不是 IIII,而是 IV(5-1); 9 是 IX(10-1); 40 是 XL;90 是 XC;400 是 CD;900 是 CM。 面试官常考的就是你能不能把这些组合处理干净。

小伙子一开始的思路特别直男:从千位、百位、十位、个位一个个拆,然后自己写一堆 if/else,什么“如果百位是 3 就拼 CCC”这种。写到后面,自己都看不懂了。其实这个题更顺手的写法,是“贪心”:每次尽量用最大的罗马数字往上凑。

简单说下贪心的想法,就是先准备一张从大到小的“对照表”,包括那些减法形式,一口气都列进去:

  • 1000 -> "M"
  • 900  -> "CM"
  • 500  -> "D"
  • 400  -> "CD"
  • 100  -> "C"
  • 90   -> "XC"
  • 50   -> "L"
  • 40   -> "XL"
  • 10   -> "X"
  • 9    -> "IX"
  • 5    -> "V"
  • 4    -> "IV"
  • 1    -> "I"

思路就很好记了: 给你一个 num,一直从最大的 1000 开始看,如果 num ≥ 1000,就拼一个 "M",num 减 1000;还能减就继续。减不动了就看下面 900,能减就拼 "CM"……一直往下走,最后 num 会变成 0,拼出来的字符串就是答案。

为啥这个贪心不会出错?因为:

  1. 表里已经把所有“特殊写法”(4、9、40、90、400、900)都列出来了。
  2. 我们永远优先用大的,所以不会出现 “VIIII” 这种奇怪写法,因为在减到 9 的时候,就直接用 "IX" 了。

说完人话,整点 Rust 代码,小伙子当场就抄走了:

fnint_to_roman(mut num: i32) -> String {// 从大到小的数值和对应符号let values = [1000900500400,100,  90,  50,  40,10,   9,   5,   41];let symbols = ["M",  "CM""D",  "CD","C",  "XC""L",  "XL","X",  "IX""V",  "IV""I"];letmut res = String::new();// 逐个尝试从 num 里“扣掉”这些数for (v, s) in values.iter().zip(symbols.iter()) {while num >= *v {            res.push_str(s);            num -= *v;        }    }    res}fnmain() {let tests = [349581994];for n in tests {let roman = int_to_roman(n);println!("{} -> {}", n, roman);    }}

跑一下,大概输出是这样的(别纠结顺序格式哈):

  • 3 -> III
  • 4 -> IV
  • 9 -> IX
  • 58 -> LVIII  (50 + 5 + 3)
  • 1994 -> MCMXCIV (1000 + 900 + 90 + 4)

这个实现有几个小点你可以顺手记一下:

第一,num 用 mut,因为我们一直在往下减。 第二,values 和 symbols 用同样顺序,然后 zip 一下,for 循环里就不会写错对应关系。 第三,时间复杂度其实很稳,values 就 13 个数字,每个最多循环几次,num 最大也就 3999,这点操作在面试题里可以忽略不计。

那天我把代码给小伙子看,他愣了一下说:原来可以不用想“几千几百几十个”的那种拆法,直接这么扣就完事了。然后他又打开下一道题,我准备去倒杯水…结果杯子都还没洗干净,测试那边又来催 log 了,先忙活别的去了。

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  1. CONNECT:[ UseTime:0.000704s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000881s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.018924s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.009588s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000740s ]
  6. SELECT * FROM `set` [ RunTime:0.022513s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002029s ]
  8. SELECT * FROM `article` WHERE `id` = 468780 LIMIT 1 [ RunTime:0.019512s ]
  9. UPDATE `article` SET `lasttime` = 1770478876 WHERE `id` = 468780 [ RunTime:0.010287s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000811s ]
  11. SELECT * FROM `article` WHERE `id` < 468780 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000950s ]
  12. SELECT * FROM `article` WHERE `id` > 468780 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000392s ]
  13. SELECT * FROM `article` WHERE `id` < 468780 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.055272s ]
  14. SELECT * FROM `article` WHERE `id` < 468780 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.095685s ]
  15. SELECT * FROM `article` WHERE `id` < 468780 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007402s ]
0.354669s