xinyu04

摘要： You have information about n different recipes. You are given a string array recipes and a 2D string array ingredients. The $i$-th recipe has the name 阅读全文

摘要： You are given a stream of records about a particular stock. Each record contains a timestamp and the corresponding price of the stock at that timestam 阅读全文

摘要： Given the root of a binary tree, collect a tree's nodes as if you were doing this: Collect all the leaf nodes. Remove all the leaf nodes. Repeat until 阅读全文

摘要： You are given the root of a binary tree with n nodes. Each node is uniquely assigned a value from 1 to n. You are also given an integer startValue rep 阅读全文