3389. 使字符频率相等的最小操作数
Hard | Hash Table, String, Dynamic Programming, Counting, Enumeration
Hash Table
3395. 具有唯一中间众数的子序列 I
Hard | Array, Hash Table, Math, Combinatorics
3396. 使数组元素互不相同的最少操作次数
Easy | Array, Hash Table
3404. 统计特殊子序列
Medium | Array, Hash Table, Math, Enumeration
3408. 设计任务管理器
Medium | Hash Table, Design, Heap (Priority Queue), Ordered Set
3412. 字符串的镜像分数
Medium | Hash Table, String, Stack, Simulation
3425. 最长特殊路径
Hard | Array, Hash Table, Tree, Depth-First Search, Prefix Sum
3434. 子数组操作后的最大频率
Medium | Array, Hash Table, Dynamic Programming, Greedy, Enumeration, Prefix Sum
3438. 在字符串中查找相邻数字的有效对
Easy | Hash Table, String, Counting
3442. 奇偶频率差的最大值 I
Easy | Hash Table, String, Counting