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问题描述Validate if a given string is numeric.Some examples:"0"=>true" 0.1 "=>true"abc"=>false"1 a"=>false"2e10"=>trueNote:It is intended for the problem ... 阅读全文
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问题描述Given two words (beginWordandendWord), and a dictionary, find the length of shortest transformation sequence frombeginWordtoendWord, such that:Onl... 阅读全文
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Problem I:判断数字是不是回文字符串形式Determine whether an integer is a palindrome. Do this without extra space.click to show spoilers.Some hints:Could negative int... 阅读全文
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记录周围伙伴们面试Google遇到的问题和大致解决思路。【算法】ARRAY | 数组1.给定一个有序数组，和两个值表示区间的开始和结束，找出数组中不在这个区间里的元素比如[1,2,4] 1,10输出[3,5-10]2.给两个集合，找出两个集合中的不一样的部分[1,2,2,2],[1,2,3]输出[2... 阅读全文
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问题描述Clone an undirected graph. Each node in the graph contains alabeland a list of itsneighbors.OJ's undirected graph serialization:Nodes are labeled ... 阅读全文
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双层桶划分双层桶划分----其实本质上还是分而治之的思想，重在“分”的技巧上！适用范围：第k大，中位数，不重复或重复的数字基本原理及要点：因为元素范围很大，不能利用直接寻址表，所以通过多次划分，逐步确定范围，然后最后在一个可以接受的范围内进行。可以通过多次缩小，双层只是一个例子。扩展：问题实例：13... 阅读全文
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问题描述Given a binary tree, determine if it is a valid binary search tree (BST).Assume a BST is defined as follows:The left subtree of a node contains on... 阅读全文
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Problem I: Lowest Common Ancestor of a Binary Search TreeGiven a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in... 阅读全文
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问题描述Givennpoints on a 2D plane, find the maximum number of points that lie on the same straight line.解决思路1.定义Line类{slope; intercept; isVertical; isHor... 阅读全文
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问题描述You are given a string,s, and a list of words,words, that are all of the same length. Find all starting indices of substring(s) insthat is a conca... 阅读全文