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Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of 阅读全文
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Write a function to find the longest common prefix string amongst an array of strings. 1 public class Solution { 2 3 // 1. Method 1, start from the fi 阅读全文
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题目： Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and set. get(key) - Get 阅读全文
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The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font 阅读全文
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The gray code is a binary numeral system where two successive values differ in only one bit. Given a non-negative integer n representing the total num 阅读全文
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Given a set of distinct integers, nums, return all possible subsets. Note: Elements in a subset must be in non-descending order. The solution set must 阅读全文
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Given an array of integers, every element appears three times except for one. Find that single one. Note:Your algorithm should have a linear runtime c 阅读全文
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Write a program to implement your own ArrayList class. It should contain add(), get(), remove(), size() methods. Use dynamic array logic. It should in 阅读全文
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There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity sh 阅读全文
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第一种形式是 publicclassSingleton{ privateSingleton(){} privatestaticfinalSingletoninstance=newSingleton(); publicstaticSingletonget... 阅读全文