Uber 2017 -06
U家特点：感觉geo方面的会考，然后图的算法好像必考，bq问得很有技巧。
380 Insert Delete GetRandom O(1)
297 Serialize and Deserialize Binary Tree
186 Reverse Words in a String II
17 Letter Combinations of a Phone Number
10 Regular Expression Matching
208 Implement Trie (Prefix Tree)
230 Kth Smallest Element in a BST
138 Copy List with Random Pointer
33 Search in Rotated Sorted Array
121 Best Time to Buy and Sell Stock
104 Maximum Depth of Binary Tree
373 Find K Pairs with Smallest Sums
516 Longest Palindromic Subsequence
238 Product of Array Exclude itself
Serilization and Deserialize n-ary Tree
Forward backward slash sperated squares
password generate according to list
message cut to max length then send
fully distributed expression
sloving equation
gift wrapping algorithm -- 我去原来是convex hall那个算法...javis march + graham scan ?
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