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Day 1 - Facebook DFS

Medium

• [ ] 301 Remove Invalid Parentheses
• [ ] 721 Accounts Merge

Hard

• [ ] 124 Binary Tree Maximum Path Sum

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Day 2 - Facebook DFS

Medium

• [ ] 394 Decode String
• [ ] 529 Minesweeper

Hard

• [ ] 329 Longest Increasing Path in a Matrix

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Day 3 - Facebook DFS

Medium

• [ ] 494 Target Sum
• [ ] 332 Reconstruct Itinerary

Hard

• [ ] 489 Robot Room Cleaner

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Day 4 - Facebook DFS

Medium

• [ ] 694 Number of Distinct Islands
• [ ] 109 Convert Sorted List to Binary Search Tree

Hard

• [ ] 44 Wildcard Matching

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Day 5

Medium

• [ ] 547 Friend Circles
• [ ] 117 Populating Next Right Pointers in Each Node II

Hard

• [ ] 99 Recover Binary Search Tree

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Day 6

Medium

• [ ] 17 Letter Combinations of a Pho
• [ ] 417 Pacific Atlantic Water Flow

Hard

• [ ] 968 Binary Tree Cameras

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Day 7

Medium

• [ ] 79 Word Search
• [ ] 93 Restore IP Addresses

Hard

• [ ] 10 Regular Expression Matching

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剩余DFS

Medium

• [ ] 211 Add and Search Word - Data structure design
• [ ] 60 Permutation Sequence
• [ ] 22 Generate Parentheses
• [ ] 886 Possible Bipartition
• [ ] 491 Increasing Subsequences
• [ ] 129 Sum Root to Leaf Numbers
• [ ] 430 Flatten a Multilevel Doubly Linked List
• [ ] 785 Is Graph Bipartite?
• [ ] 490 The Maze
• [ ] 505 The Maze II
• [ ] 337 House Robber III
• [ ] 515 Find Largest Value in Each Tree Row
• [ ] 1123 Lowest Common Ancestor

Hard

• [ ] 140 Word Break II
• [ ] 212 Word Search II
• [ ] 37 Sudoku Solver
• [ ] 691 Stickers to Spell Word
• [ ] 51 N-Queens
• [ ] 52 N-Queens II
• [ ] 291 Word Pattern II