851. 喧闹和富有
Medium | Array, Depth-First Search, Graph Theory, Topological Sort
Depth-First Search
863. 二叉树中所有距离为 K 的结点
Medium | Hash Table, Tree, Depth-First Search, Breadth-First Search, Binary Tree
865. 包含所有最深节点的最小子树
Medium | Hash Table, Tree, Depth-First Search, Breadth-First Search, Binary Tree
872. 叶子相似的树
Easy | Tree, Depth-First Search, Binary Tree
897. 递增顺序查找树
Easy | Stack, Tree, Depth-First Search, Binary Search Tree, Binary Tree
924. 最小化恶意软件传播
Hard | Array, Hash Table, Depth-First Search, Breadth-First Search, Union-Find, Graph Theory
928. 最小化恶意软件的传播 II
Hard | Array, Hash Table, Depth-First Search, Breadth-First Search, Union-Find, Graph Theory
938. 二叉搜索树的范围和
Easy | Tree, Depth-First Search, Binary Search Tree, Binary Tree
947. 移除最多的同行或同列石头
Medium | Hash Table, Depth-First Search, Union-Find, Graph Theory
951. 翻转等价二叉树
Medium | Tree, Depth-First Search, Binary Tree