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摘要： Factory is a design pattern in common usage. Please implement a ToyFactory which can generate proper toy based on the given type. Example ToyFactory t 阅读全文

摘要： Singleton is a most widely used design pattern. If a class has and only has one instance at every moment, we call this design as singleton. For exampl 阅读全文

摘要： Giving a string with number from 1-n in random order, but miss 1 number.Find that number. Notice n <= 30 Example Given n = 20, str = 19201234567891011 阅读全文

摘要： Given two strings S and T, determine if they are both one edit distance apart. Example Given s = "aDb", t = "adb" return true Given s = "aDb", t = "ad 阅读全文

摘要： Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have 阅读全文

摘要： The thief has found himself a new place for his thievery again. There is only one entrance to this area, called the "root." Besides the root, each hou 阅读全文

摘要： After robbing those houses on that street, the thief has found himself a new place for his thievery so that he will not get too much attention. This t 阅读全文

摘要： You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping yo 阅读全文

摘要： For a given source string and a target string, you should output the first index(from 0) of target string in source string. If target does not exist i 阅读全文

摘要： Given a nested list of integers, implement an iterator to flatten it. Each element is either an integer, or a list -- whose elements may also be integ 阅读全文