shaer

摘要： HashMap和HashSet的区别是Java面试中最常被问到的问题。如果没有涉及到Collection框架以及多线程的面试，可以说是不完整。而Collection框架的问题不涉及到HashSet和HashMap，也可以说是不完整。HashMap和HashSet都是collection框架的一部分， 阅读全文

摘要： Given a linked list, determine if it has a cycle in it. To represent a cycle in the given linked list, we use an integer pos which represents the posi 阅读全文

摘要： Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note: The number of elements initialized in nums1 and num 阅读全文

摘要： Write a function that takes a string as input and reverse only the vowels of a string. Example 1: Example 2: Input: "leetcode" Output: "leotcede" Exam 阅读全文

摘要： 题目： Given a non-negative integer c, your task is to decide whether there're two integers a and b such that a2 + b2 = c. Example 1: Example 2: 方法二：数学方法 阅读全文

摘要： Write a function to find the longest common prefix string amongst an array of strings. If there is no common prefix, return an empty string "". Exampl 阅读全文