摘要： 题目： Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5,Return [ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1 阅读全文

摘要： 题目： 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 su 阅读全文