摘要：
题目如下： We run a preorder depth first search on the root of a binary tree. At each node in this traversal, we output D dashes (where D is the depth of t 阅读全文
摘要：
题目如下： Given an array A of integers, return the length of the longest arithmetic subsequence in A. Recall that a subsequence of A is a list A[i_1], A[i 阅读全文
摘要：
题目如下： Given the root of a binary tree, find the maximum value V for which there exists different nodes A and B where V = |A.val - B.val| and A is an a 阅读全文
摘要：
题目如下： There are 2N people a company is planning to interview. The cost of flying the i-th person to city A is costs[i][0], and the cost of flying the 阅读全文
摘要：
题目如下： We are given a matrix with R rows and C columns has cells with integer coordinates (r, c), where 0 <= r < R and 0 <= c < C. Additionally, we are 阅读全文
摘要：
题目如下： Given an array A of non-negative integers, return the maximum sum of elements in two non-overlapping (contiguous) subarrays, which have lengths 阅读全文
摘要：
题目如下： Implement the StreamChecker class as follows: StreamChecker(words): Constructor, init the data structure with the given words. query(letter): re 阅读全文