Facebook 2017-06
FB的特点：题要写bug free，一轮2题。DP会考，有些题的边界条件很但写对，就像什么read 4k那一类。
Culture : Be bold, Be Open, Move Fast, Focus on Impact, Build social value
325 Maximum Size Subarray Sum Equals k
311 Sparse matrix Multiplication
314 Binary Tree Vertical Order Traversal
17 Letter Combinations of a Phone Number
10 Regular Expression Matching
158 Read n Characters Given Read4 II - Call multiple times
297 Serialize and Deserialize Binary Tree
157 Read n Characters Given Read4
211 Add and Search Word -- Data structure design
121 Best Time to Buy and Sell Stock
341 Flatten Nested Litst Iterator
173 Binary Search Tree Iterator
98 Validate Binary Search Tree
236 Lowest Common Ancestor of a Binary Tree
238 Product of Array Except Self
215 Kth Largest Element in an Array
33 Search in Rotated Sorted Array
208 Implement Trie (Prefix Tree)
380 Insert Delete GetRandom O(1)
128 Longest Consecutive Sequence
102 Binary Tree Level Order Traversal
334 Increasing Triplet Subsequnce
235 Lowest Common Ancestor of a Binary Search Tree
117 Populating next Right Pointers in Each Node II
80 Remove Duplicates from Sorted Array II
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