1081. 不同字符的最小子序列
Medium | String, Stack, Greedy, Monotonic Stack
Medium
1090. 从标签中选取最大值
Medium | Array, Hash Table, Greedy, Sorting, Counting
1091. 二进制矩阵中的最短路径
Medium | Array, Breadth-First Search, Matrix
1094. 拼车
Medium | Array, Sorting, Heap (Priority Queue), Simulation, Prefix Sum
1104. 之字形标记二叉树中的路径
Medium | Math, Tree, Binary Tree
1105. 填充书架
Medium | Array, Dynamic Programming
1109. 航班预订统计
Medium | Array, Prefix Sum
1110. 删点成林
Medium | Array, Hash Table, Tree, Depth-First Search, Binary Tree
1111. 两个有效括号字符串的最大嵌套深度
Medium | String, Stack
1123. 最深叶节点的最近公共祖先
Medium | Hash Table, Tree, Depth-First Search, Breadth-First Search, Binary Tree