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题目： The gray code is a binary numeral system where two successive values differ in only one bit. Given a non-negative integer n representing the total 阅读全文
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题目： Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may co 阅读全文
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题目： Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example, Given n = 3, there are a total of 5 unique 阅读全文