摘要： Given a binary tree, collect a tree's nodes as if you were doing this: Collect and remove all leaves, repeat until the tree is empty. Example:Given bi 阅读全文

摘要： Given a non-negative number represented as a singly linked list of digits, plus one to the number. The digits are stored such that the most significan 阅读全文

摘要： Assume you have an array of length n initialized with all 0's and are given k update operations. Each operation is represented as a triplet: [startInd 阅读全文

摘要： A string such as "word" contains the following abbreviations: Given a target string and a set of strings in a dictionary, find an abbreviation of this 阅读全文