silentteller

摘要： 题目： Given an unsorted array of integers, find the length of the longest consecutive elements sequence. Your algorithm should run in O(n) complexity. E 阅读全文

摘要： 题目： On an NxN chessboard, a knight starts at the r-th row and c-th column and attempts to make exactly K moves. The rows and columns are 0 indexed, so 阅读全文

摘要： 题目： Given a binary tree, find the length of the longest path where each node in the path has the same value. This path may or may not pass through the 阅读全文

摘要： 题目： Given a string containing only three types of characters: '(', ')' and '*', write a function to check whether this string is valid. We define the 阅读全文

摘要： 题目： 一个花园有N个位置。每个位置上有一朵花。这N朵花会在N天内逐一盛开。每天都一定会有并且只有一朵花盛开，从这天起，这朵花将一直处于盛开的状态。 给定一个由数字1到N组成的数组flowers。数组中的每个数字表示那一天将会盛开的花的位置。 例如，flowers[i] = x表示在位置x上的花会在 阅读全文

摘要： 题目： You are given a data structure of employee information, which includes the employee's unique id, his importance value and his direct subordinates' 阅读全文

摘要： 题目： In this problem, a tree is an undirected graph that is connected and has no cycles. The given input is a graph that started as a tree with N nodes 阅读全文

摘要： 题目： Implement a trie with insert, search, and startsWith methods. Example: Trie trie = new Trie(); trie.insert("apple"); trie.search("apple"); // retu 阅读全文

摘要： 题目： Given two words (beginWord and endWord), and a dictionary's word list, find all shortest transformation sequence(s) from beginWord to endWord, suc 阅读全文

摘要： 题目： Given two words (beginWord and endWord), and a dictionary's word list, find the length of shortest transformation sequence from beginWord to endWo 阅读全文