当前位置:首页>Linux>面了个要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.他憋了半天,写了个cat'~

面了个要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.他憋了半天,写了个cat'~

  • 2026-02-27 19:12:43
面了个要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.他憋了半天,写了个cat'~

刚看到个贴子,说有网友面试一个自称“精通Linux/Shell”的,张口就要28K。面试官让他现场写个统计Nginx日志里访问量Top10 IP的命令,结果他憋半天只写出个cat,awk、sort、uniq全不会,场面尴尬到脚趾抠出机房。

我觉得这事吧,关键不在那条命令,而在“精通”这俩字。现在不少人写简历跟点外卖似的,能用就写“熟练”,会装就写“精通”,最后把自己坑进去了。要价高没问题,但前提是你得真有值这个价的本事。面试官也没多过分,就是用个最基础的场景题验证一下。

换个角度想,技术这行,基本功就是你的底线价格。别把“会敲几个命令”当饭碗,踏实把基础打牢,比在简历上堆词儿靠谱多了。说到底,想拿多少薪资,先让自己配得上,这样谈钱才硬气。

今日算法题:整数转罗马数字

昨天晚上十一点多,我在公司楼下便利店门口喝着酸奶,准备回去把一个 bug 收个尾,我们组那个小李突然微信丢给我一题,说“哥,整数转罗马数字你会写不”。我当时脑子一抽,还以为让我背“IVXLCDM”口诀,结果一看,是面试常考的那个算法题。

题目大概意思就是:给你一个正整数,比如 1994,把它变成罗马数字字符串,比如 "MCMXCIV"。一般约定输入范围是 1 到 3999,超过这个范围罗马人自己都懒得管了,对吧。

先把罗马数字这套“古人协议”说清楚,不然写代码全是懵的。常用的七个符号:

  • I = 1
  • V = 5
  • X = 10
  • L = 50
  • C = 100
  • D = 500
  • M = 1000

但它又不是单纯的加加加,还有减法规则,比如: 4 不是 "IIII" 而是 "IV"(小的在前面减掉), 9 是 "IX", 40 是 "XL", 90 是 "XC", 400 是 "CD", 900 是 "CM"。

也就是说,你得同时处理“普通”的和值,还有这几个特殊组合,不然就会把 9 转成 "VIIII",面试官直接给你一个大大的问号。

我当时跟小李说:这个题别想复杂,最舒服的写法就是“贪心”,从最大的罗马面值往下减。就有点像你去买奶茶,先尽量用 100 块,剩下再用 50,再 20,再 10,直到找不开为止。

具体做法就是准备两个数组,对应好数字和字符串:

  • 数组里的数字:1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1
  • 对应的罗马串:"M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"

然后从左往右扫一遍,每次看当前 num 还能减多少次这个数,能减就减,同时把对应的罗马串拼上去。这样一轮下来,num 就变成 0 了,答案也就出来了。因为这个数组是写死的,长度固定,复杂度就相当于 O(1),跑得飞快。

我用 js 给他敲了一版,大概长这样:

// 整数转罗马数字functionintToRoman(num{// 安排好从大到小的数值和罗马数字const values = [1000900500400,100905040,109541  ];const symbols = ["M""CM""D""CD","C""XC""L""XL","X""IX""V""IV""I"  ];let res = "";// 从最大面值开始“贪心”地减for (let i = 0; i < values.length && num > 0; i++) {const value = values[i];const symbol = symbols[i];// 这个 while 很关键,同一个面值可能要用多次while (num >= value) {      num -= value;      res += symbol;    }  }return res;}// 简单测几下console.log(intToRoman(3));    // "III"console.log(intToRoman(58));   // "LVIII"console.log(intToRoman(1994)); // "MCMXCIV"

你看一下比如 58 这个例子,脑子里过一遍就更清楚了:

  • 58 < 1000、900、500...一直跳到 50
  • 58 >= 50,于是 num -= 50 变成 8,结果串 += "L"
  • 8 < 40、10、9,跳到 5
  • 8 >= 5,于是 num = 3,结果串 += "V"
  • 然后 3 >= 1,一口气拼三个 "I",最后得到 "LVIII"

这个过程就完全是我们数组里从大到小扫一遍,不断减、不停拼的一个循环,逻辑很直观,小李当场就“哦——这样啊”那种表情。

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  1. CONNECT:[ UseTime:0.000629s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000848s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000323s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000289s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000567s ]
  6. SELECT * FROM `set` [ RunTime:0.000224s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000693s ]
  8. SELECT * FROM `article` WHERE `id` = 475909 LIMIT 1 [ RunTime:0.000500s ]
  9. UPDATE `article` SET `lasttime` = 1772240601 WHERE `id` = 475909 [ RunTime:0.002994s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000260s ]
  11. SELECT * FROM `article` WHERE `id` < 475909 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000575s ]
  12. SELECT * FROM `article` WHERE `id` > 475909 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000486s ]
  13. SELECT * FROM `article` WHERE `id` < 475909 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004841s ]
  14. SELECT * FROM `article` WHERE `id` < 475909 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001652s ]
  15. SELECT * FROM `article` WHERE `id` < 475909 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005860s ]
0.088910s