117. 填充每个节点的下一个右侧节点指针 II
Medium | Linked List, Tree, Depth-First Search, Breadth-First Search, Binary Tree
Breadth-First Search
130. 被围绕的区域
Medium | Array, Depth-First Search, Breadth-First Search, Union-Find, Matrix
133. 克隆图
Medium | Hash Table, Depth-First Search, Breadth-First Search, Graph Theory
200. 岛屿数量
Medium | Array, Depth-First Search, Breadth-First Search, Union-Find, Matrix
207. 课程表
Medium | Depth-First Search, Breadth-First Search, Graph Theory, Topological Sort
210. 课程表 II
Medium | Depth-First Search, Breadth-First Search, Graph Theory, Topological Sort
226. 翻转二叉树
Easy | Tree, Depth-First Search, Breadth-First Search, Binary Tree
279. 完全平方数
Medium | Math, Dynamic Programming, Breadth-First Search
297. 序列化和反序列化二叉树
Hard | String, Tree, Depth-First Search, Breadth-First Search, Design, Binary Tree
301. 移除无效的括号
Hard | String, Backtracking, Breadth-First Search