- Backtracking - 93. Restore IP Addresses
- DFS&BFS - 200. Number of Islands
- Tree - 113. Path Sum II
- Tree - 129. Sum Root to Leaf Numbers
- Tree - 111. Minimum Depth of Binary Tree
- Tree - 298. Binary Tree Longest Consecutive Sequence
- Tree - 104. Maximum Depth of Binary Tree
- Tree - 110. Balanced Binary Tree
- Tree - 124. Binary Tree Maximum Path Sum
- Tree - 250. Count Univalue Subtrees
- Tree - 337. House Robber III
- Trie - 208. Implement Trie (Prefix Tree)
- Trie - 211. Add and Search Word - Data structure design
- Trie - 212. Word Search II
- Tree - 107. Binary Tree Level Order Traversal II
- Tree - 103. Binary Tree Zigzag Level Order Traversal
- Tree - 199. Binary Tree Right Side View
- Tree - 98. Validate Binary Search Tree
- Tree - 235. Lowest Common Ancestor of a Binary Search Tree
- Tree - 236. Lowest Common Ancestor of a Binary Tree
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