388. 最长绝对文件路径
Medium | String, Stack, Depth-First Search
Depth-First Search
399. 除法求值
Medium | Array, String, Depth-First Search, Breadth-First Search, Union-Find, Graph Theory, Shortest Path
404. 左叶子之和
Easy | Tree, Depth-First Search, Breadth-First Search, Binary Tree
417. 太平洋大西洋水流问题
Medium | Array, Depth-First Search, Breadth-First Search, Matrix
430. 扁平化多级双向链表
Medium | Linked List, Depth-First Search, Doubly-Linked List
437. 路径总和 III
Medium | Tree, Depth-First Search, Binary Tree
449. 序列化和反序列化二叉搜索树
Medium | String, Tree, Depth-First Search, Breadth-First Search, Design, Binary Search Tree, Binary Tree
100. 相同的树
Easy | Tree, Depth-First Search, Breadth-First Search, Binary Tree
101. 对称二叉树
Easy | Tree, Depth-First Search, Breadth-First Search, Binary Tree
104. 二叉树的最大深度
Easy | Tree, Depth-First Search, Breadth-First Search, Binary Tree