1896. 改变表达式最终值的最小开销
Hard | Math, String, Dynamic Programming, Stack
String
3003. 操作后的最大分割数
Hard | String, Dynamic Programming, Bit Manipulation, Bitmask
3348. 最小可整除数字乘积 II
Hard | Math, String, Backtracking, Greedy, Number Theory
3474. 字典序最小的生成字符串
Hard | String, Greedy, String Matching
3841. 树中回文路径查询
Hard | Array, String, Divide and Conquer, Tree, Segment Tree
745. 前缀和后缀搜索
Hard | Array, Hash Table, String, Design, Trie
770. 基础计算器 IV
Hard | Hash Table, Math, String, Stack, Recursion
1638. 统计只差一个字符的子字符串数目
Medium | Hash Table, String, Dynamic Programming, Enumeration
1657. 确定两个字符串是否接近
Medium | Hash Table, String, Sorting, Counting
1684. 统计一致字符串的数目
Easy | Array, Hash Table, String, Bit Manipulation, Counting