xinyu04

摘要： You are implementing a program to use as your calendar. We can add a new event if adding the event will not cause a double booking. A double booking h 阅读全文

摘要： You are given a stream of points on the X-Y plane. Design an algorithm that: Adds new points from the stream into a data structure. Duplicate points a 阅读全文

摘要： You are given an integer finalSum. Split it into a sum of a maximum number of unique positive even integers. For example, given finalSum = 12, the fol 阅读全文

摘要： What is the smallest integer greater than 0 that can be written entirely with zeros and ones and is evenly divisible by 225? Solution 将其分解： $$ 225 = 5 阅读全文

摘要： You are given an array of words where each word consists of lowercase English letters. $word_A$ is a predecessor of $word_B$ if and only if we can ins 阅读全文

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

摘要： You are given a string s of lowercase English letters and an integer array shifts of the same length. Call the shift() of a letter, the next letter in 阅读全文