1896. 改变表达式最终值的最小开销
Hard | Math, String, Dynamic Programming, Stack
Stack
770. 基础计算器 IV
Hard | Hash Table, Math, String, Stack, Recursion
1776. 车队 II
Hard | Array, Math, Stack, Heap (Priority Queue), Monotonic Stack
2019. 学生们解数学表达式的分数
Hard | Array, Hash Table, Math, String, Dynamic Programming, Stack, Memoization
1003. 检查字符串是否有效
Medium | String, Stack
1504. 统计全为1的子矩形
Medium | Array, Dynamic Programming, Stack, Matrix, Monotonic Stack
20. 有效的括号
Easy | String, Stack
488. 祖玛游戏
Hard | String, Dynamic Programming, Stack, Breadth-First Search, Memoization
735. 小行星碰撞
Medium | Array, Stack, Simulation
736. 解析 Lisp 表达式
Hard | Hash Table, String, Stack, Recursion
844. 比较含退格的字符串
Easy | Two Pointers, String, Stack, Simulation
3229. 使数组等于目标数组所需的最少操作数
Hard | Array, Dynamic Programming, Stack, Greedy, Monotonic Stack
3412. 字符串的镜像分数
Medium | Hash Table, String, Stack, Simulation
3420. 经过 K 次操作后非递减子数组的数量
Hard | Array, Stack, Segment Tree, Queue, Sliding Window, Monotonic Stack, Monotonic Queue
3430. 最多 K 个元素的子数组的最大值和最小值之和
Hard | Array, Math, Stack, Monotonic Stack
3523. 使数组非递减
Medium | Array, Stack, Greedy, Monotonic Stack
3542. 将所有元素转换为零的最少操作次数
Medium | Array, Hash Table, Stack, Greedy, Monotonic Stack
3561. 相邻删除后的字符串
Medium | String, Stack, Simulation
3638. 最大平衡货运数量
Medium | Array, Dynamic Programming, Stack, Greedy, Monotonic Stack
3676. 碗形子数组计数
Medium | Array, Stack, Monotonic Stack