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Find the contiguous subarray within an array (containing at least one number) which has the largest sum.For example, given the array [-2,1,-3,4,-1,2,1,-5,4],the contiguous subarray [4,-1,2,1]

Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the array, and it should return false if every elemen

A binary watch has 4 LEDs on the top which represent the hours (0-11), and the 6 LEDs on the bottom represent theminutes (0-59).Each LED represents a zero or one, with the least significant bi

 public int reverse(int x) { long res=0; while(x!=0) { res=res*10+x%10; x=x/10; } if (res>Integer.MAX_VALUE||res<Integer.MIN_VAL

Given a positive integer, return its corresponding column title as appear in an Excel sheet.For example:   1 -> A 2 -> B 3 -> C ... 26 -> Z 27 -> AA 28 -> AB public class Solution { publ

Related to question Excel Sheet Column TitleGiven a column title as appear in an Excel sheet, return its corresponding column number.For example:    A -> 1 B -> 2 C -> 3 ... Z -> 26 AA ->

Given a string which consists of lowercase or uppercase letters, find the length of the longest palindromes that can be built with those letters.This is case sensitive, for example "Aa" is not c

Given two strings s and t, write a function to determine if t is an anagram of s.For example,s = "anagram", t = "nagaram", return true.s = "rat", t = "car", return false. Note:You may

Given an array of size n, find the majority element. The majority element is the element that appearsmore than ⌊ n/2 ⌋ times.You may assume that the array is non-empty and the majority element

Given an arbitrary ransom note string and another string containing letters from all the magazines, write a function that will return true if the ransom note can be constructed from the magazines

Given an integer, return its base 7 string representation.Example 1:Input: 100Output: "202"Example 2:Input: -7Output: "-10"Note: The input will be in range of [-1e7, 1e7]. public c

Assume you are an awesome parent and want to give your children some cookies. But, you should give each child at most one cookie. Each child i has a greed factor gi, which is the minimum size of a

Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements.For example, given nums = [0, 1, 0, 3, 12], after calling you

Given scores of N athletes, find their relative ranks and the people with the top three highest scores, who will be awarded medals: "Gold Medal", "Silver Medal" and "Bronze Medal".Example 1:In

Given an array of integers and an integer k, find out whether there are two distinct indicesi and j in the array such that nums[i] = nums[j] and theabsolute difference between i and j is at mo

public class Solution { public int[] twoSum(int[] nums, int target) { int len=nums.length; if(nums==null||len==0) return null; int s=0; int[] res=ne

Given an integer, write a function to determine if it is a power of three.Follow up:Could you do it without using any loop / recursion? 递归：public class Solution { public static boolean

Write a program to check whether a given number is an ugly number.Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example,6, 8 are ugly while 14 is not ugly sin

Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order.You may assume no duplicates in the arra

Reverse bits of a given 32 bits unsigned integer.For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), return 964176192 (represented in binary as001110

Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as theHamming weight).For example, the 32-bit integer ’11' has binary representation 00000

Given an integer, write an algorithm to convert it to hexadecimal. For negative integer,two’s complement method is used.Note: All letters in hexadecimal (a-f) must be in lowercase.The he

Given an array of n integers where n > 1, nums, return an arrayoutput such that output[i] is equal to the product of all the elements ofnums except nums[i].Solve it without division and in O

Given an array of integers, 1 ≤ a[i] ≤ n (n = size of array), some elements appeartwice and others appear once.Find all the elements that appear twice in this array.Could you do it without e

Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in their binary representation and return them as an array.Example:For num

Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array.For example,Given nums = [0, 1, 3] return 2. Note:Your algorithm should

Given an integer (signed 32 bits), write a function to check whether it is a power of 4.Example:Given num = 16, return true. Given num = 5, return false. Follow up: Could you solve it withou

Given an integer, write a function to determine if it is a power of two. public class Solution { public boolean isPowerOfTwo(int n) { if(n<0) return false; if(Int

Write an algorithm to determine if a number is "happy".A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squar

Given a string s consists of upper/lower-case alphabets and empty space characters' ', return the length of last word in the string.If the last word does not exist, return 0.Note: A word is

For a web developer, it is very important to know how to design a web page's size. So, given a specific rectangular web page’s area, your job by now is to design a rectangular web page, whose leng

Given a non-negative integer num, repeatedly add all its digits until the result has only one digit.For example: Given num = 38, the process is like: 3 + 8 = 11, 1 + 1 = 2. Since 2 has only

Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation.Note:The given integer is guaranteed to fit within the rang

Given a linked list, determine if it has a cycle in it.Follow up:Can you solve it without using extra space? /** * Definition for singly-linked list. * class ListNode { * int val;

Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists./** * Definition for singly-linked list. * publ

Given a sorted linked list, delete all duplicates such that each element appear onlyonce.For example,Given 1->1->2, return 1->2.Given 1->1->2->3->3, return 1->2->3. java：/** * Definit

Reverse a singly linked list.Hint: A linked list can be reversed either iteratively or recursively. Could you implement both?java:/** * Definition for singly-linked list. * public class

Write a function to delete a node (except the tail) in a singly linked list, given only access to that node.Supposed the linked list is 1 -> 2 -> 3 -> 4 and you are given the third node with value

Given two binary trees, write a function to check if they are equal or not.Two binary trees are considered equal if they are structurally identical and the nodes have the same value./** * D

Given a word, you need to judge whether the usage of capitals in it is right or not.We define the usage of capitals in a word to be right when one of the following cases holds:All letters