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Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. Note: For the purpose of this problem, w 阅读全文
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Given an array nums of n integers where n > 1, return an array output such that output[i] is equal to the product of all the elements of nums except n 阅读全文
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There is a new alien language which uses the latin alphabet. However, the order among letters are unknown to you. You receive a list of non-empty word 阅读全文
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Given a binary tree, you need to compute the length of the diameter of the tree. The diameter of a binary tree is the length of the longest path betwe 阅读全文
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Given an undirected graph, return true if and only if it is bipartite. 设G=(V,E)是一个无向图。如顶点集V可分割为两个互不相交的子集V1,V2之并，并且图中每条边依附的两个顶点都分别属于这两个不同的子集 思路 1. base 阅读全文
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Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and put. get(key) - Get the 阅读全文
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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 only 阅读全文
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You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fails the quality c 阅读全文