摘要： You are playing the following Flip Game with your friend: Given a string that contains only these two characters: + and -, you and your friend take tu 阅读全文

摘要： Given a stream of integers and a window size, calculate the moving average of all integers in the sliding window. For example, MovingAverage m = new M 阅读全文

摘要： Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not printed in t 阅读全文

摘要： Given a binary tree Populate each next pointer to point to its next right node. If there is no next right node, the next pointer should be set to NULL 阅读全文

摘要： Given a nested list of integers, return the sum of all integers in the list weighted by their depth. Each element is either an integer, or a list -- w 阅读全文

摘要： Given a string s and a dictionary of words dict, determine if s can be segmented into a space-separated sequence of one or more dictionary words. For 阅读全文

摘要： Description: Count the number of prime numbers less than a non-negative number, n. 阅读全文

摘要： 1. Excel Sheet Column Number Related to question Excel Sheet Column Title Given a column title as appear in an Excel sheet, return its corresponding c 阅读全文

摘要： Invert a binary tree. to Trivia:This problem was inspired by this original tweet by Max Howell: Runtime: 0ms 阅读全文

摘要： Find the sum of all left leaves in a given binary tree. Example: 3 / \ 9 20 / \ 15 7 There are two left leaves in the binary tree, with values 9 and 1 阅读全文