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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. If you were only permitted to complete at most one transac 阅读全文
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题目： Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given th 阅读全文
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题目： Given an integer n, generate all structurally unique BST's (binary search trees) that store values 1...n. For example,Given n = 3, your program sh 阅读全文