摘要：
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 comple 阅读全文
摘要：
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 transaction 阅读全文
摘要：
Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3,Return [1,3,3,1]. 自己写的~~ for i in range(1,2): i 只能取到1 阅读全文
摘要：
Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5,Return explanation: Any row can be constructed using th 阅读全文
摘要：
Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. F 阅读全文