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0321京东笔试真题 | 难度中等

  • 2026-03-29 22:03:54
0321京东笔试真题 | 难度中等

0321京东笔试真题 | 难度中等

难度中等，两题均属于"先把过程抽象清楚再去实现"的类型，考察方向一是字符串DP状态设计，二是整数图建模+BFS，基本功扎实可以稳拿。📌
T1核心洞察是：每次只处理最前面三个字符，压缩顺序固定无任何分支。状态只需记录"当前前缀压成哪个字符"，共26种，每轮枚举26×26个字符对做转移，初值全为1，共(n-1)/2轮。坑点有两处：答案可能天文数字须上大整数；n≤1e5导致DP轮数达5万，Python逐步累加需注意常数，预处理trans矩阵避免重复枚举规则。🔥
T2本质是整数图最短路。x→2x、x→⌊x/2⌋、x+1三种操作建边，BFS距离即步数。建模关键：两人各自走到会合点t的步数之和恰好是总步数，因此从a和b分别跑一次BFS，枚举所有点取da[t]+db[t]最小值即可。上界LIM=200000覆盖最优会合点范围，数据规模极小，暴力无压力。💡
备考建议：T1"固定压缩顺序→26维DP"这类降维思路在大厂中频繁变体出现，核心是先判断操作顺序有无分支；T2"枚举会合点=双源BFS"是图论建模必背套路。T1大整数你踩坑了吗？评论区聊聊👇
#京东笔试 #算法笔试 #春招备考 #字符串DP #BFS最短路
#2026春招 #京东 #暑期实习

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  1. CONNECT:[ UseTime:0.000488s ] mysql:host=127.0.0.1;port=3306;dbname=f_15386;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000640s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000274s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000283s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000491s ]
  6. SELECT * FROM `set` [ RunTime:0.000197s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000560s ]
  8. SELECT * FROM `article` WHERE `id` = 462667 LIMIT 1 [ RunTime:0.000397s ]
  9. UPDATE `article` SET `lasttime` = 1775206445 WHERE `id` = 462667 [ RunTime:0.000843s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000224s ]
  11. SELECT * FROM `article` WHERE `id` < 462667 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000410s ]
  12. SELECT * FROM `article` WHERE `id` > 462667 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000395s ]
  13. SELECT * FROM `article` WHERE `id` < 462667 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003417s ]
  14. SELECT * FROM `article` WHERE `id` < 462667 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002553s ]
  15. SELECT * FROM `article` WHERE `id` < 462667 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006800s ]
0.084187s