第一周

[tech-cow]

Day 1 - Facebook DFS

Medium

• 301 Remove Invalid Parentheses
• 721 Accounts Merge

Hard

• 124 Binary Tree Maximum Path Sum

---

Day 2 - Facebook DFS

Medium

• 394 Decode String
• 529 Minesweeper

Hard

• 329 Longest Increasing Path in a Matrix

---

Day 3 - Facebook DFS

Medium

• 494 Target Sum
• 332 Reconstruct Itinerary

Hard

• 489 Robot Room Cleaner

---

Day 4 - Facebook DFS

Medium

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

Hard

• 44 Wildcard Matching

---

Day 5

Medium

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

Hard

• 99 Recover Binary Search Tree

---

Day 6

Medium

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

Hard

• 968 Binary Tree Cameras

---

Day 7

Medium

• 79 Word Search
• 93 Restore IP Addresses

Hard

• 10 Regular Expression Matching

---

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