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- Reservoir Sampling
- Basic Calculator
- Basic Calculator II
job dependent graph
deep copy of a graph dependency ordering DFS and dynamic programming
- Sliding Window Median
- Reconstruct Itinerary 给一段有很多word的string，打印出每个word按照出现频率从高到低，再按字母顺序。 Best Time to Buy and Sell Stock
给定一个字符串，并给出一个包含若干字符串的字典，例如： 字符串"aaababc" 字典["a", "ab", "abc"] 要求将输入字符串分割成字典中出现的单词，用空间间隔，例如： 输出 "a a ab abc"
doubly linked list Game of Life Unique Path II MapReduce Best Time to Buy and Sell Stock with Transaction Fee