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转载 [LeetCode]53. Maximum Subarray

Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum.Example:Input: [-2,1,-3,4,-1,2,1,-5,4], Output: 6 Explanat...

2018-09-12 23:08:24 225

转载 [Leetcode]160.Intersection of Two Linked Lists

160 Intersection of Two Linked Lists EasyWrite a program to find the node at which the intersection of two singly linked lists begins.For example, the following two linked lists:A: a1 ...

2018-07-02 21:09:54 246

转载 [LeetCode]2. Add Two Numbers&67. Add Binary

2. Add Two Numbers67. Add Binary

2016-10-16 13:48:32 488

转载 [LeetCode]15. 3Sum【&16. 3Sum Closest】

15. 3Sum16. 3Sum Closest

2016-10-11 21:08:15 452

转载 [LeetCode]409. Longest Palindrome

EasyGiven 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 cons

2016-10-07 00:25:07 395

转载 [LeetCode]39.Combination Sum&40.Combination Sum II&216.Combination Sum III&377.Combination Sum IV

39.Combination Sum40.Combination Sum II216.Combination Sum III377.Combination Sum IV

2016-10-06 23:44:30 477

转载 [LeetCode]223. Rectangle Area

Easy Find the total area covered by two rectilinear rectangles in a 2D plane.Each rectangle is defined by its bottom left corner and top right corner as shown in the figure.Rectangle Area Assume that

2016-10-05 23:53:38 273

转载 [LeetCode]400. Nth Digit

EasyFind the nth digit of the infinite integer sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, …Note: n is positive and will fit within the range of a 32-bit signed integer (n < 231).Example 1:Input: 3Ou

2016-10-05 21:26:59 275

转载 [LeetCode]38. Count and Say

EasyThe count-and-say sequence is the sequence of integers beginning as follows: 1, 11, 21, 1211, 111221, …1 is read off as “one 1” or 11. 11 is read off as “two 1s” or 21. 21 is read off as “one 2,

2016-10-05 20:23:41 236

转载 [LeetCode]7. Reverse Integer&190. Reverse Bits

7. Reverse Integer190. Reverse Bits

2016-10-05 17:04:24 259

转载 [LeetCode]189. Rotate Array

EasyRotate an array of n elements to the right by k steps.For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4].Note: Try to come up as many solutions as you can,

2016-10-05 15:55:24 255

转载 [LeetCode]343. Integer Break

MediumGiven a positive integer n, break it into the sum of at least two positive integers and maximize the product of those integers. Return the maximum product you can get.For example, given n = 2, re

2016-10-05 10:11:07 241

转载 [LeetCode]144. Binary Tree Preorder Traversal&94. Binary Tree Inorder Traversal

144. Binary Tree Preorder Traversal94. Binary Tree Inorder Traversal

2016-10-04 23:27:44 257

转载 [LeetCode]318. Maximum Product of Word Lengths

MediumGiven a string array words, find the maximum value of length(word[i]) * length(word[j]) where the two words do not share common letters. You may assume that each word will contain only lower case

2016-10-04 16:58:01 309

转载 [LeetCode]238. Product of Array Except Self

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

2016-10-04 16:27:34 219

转载 [LeetCode]204. Count Primes

EasyDescription:Count the number of prime numbers less than a non-negative number, n.超时： public int countPrimes(int n) { int[] primes = new int[n/2+1]; int p = 0; int i = 2;

2016-10-04 10:06:19 279

转载 [LeetCode]58. Length of Last Word

EasyGiven 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 define

2016-10-03 17:34:10 239

转载 [LeetCode]257. Binary Tree Paths

EasyGiven a binary tree, return all root-to-leaf paths.For example, given the following binary tree:1 / \ 2 3 \ 5 All root-to-leaf paths are:[“1->2->5”, “1->3”]5ms:public List<String> bi

2016-10-01 16:24:53 266

转载 [LeetCode]118. Pascal's Triangle&119. Pascal's Triangle II

118. Pascal's Triangle119. Pascal's Triangle II

2016-10-01 15:53:39 264

转载 [LeetCode]112. Path Sum&113. Path Sum II

112 . Path Sum EasyGiven a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum.For example: Given the below bin

2016-10-01 12:16:35 309

转载 [LeetCode]70. Climbing Stairs

EasyYou are climbing a stair case. It takes n steps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?0ms:public int climbStairs(int n)

2016-09-29 17:28:49 212

转载 [LeetCode]206. Reverse Linked List&92. Reverse Linked List II

206. Reverse Linked List92. Reverse Linked List II

2016-09-29 17:08:54 262

转载 [LeetCode]235. Lowest Common Ancestor of a Binary Search Tree&236. Lowest Common Ancestor of a Binar

235. Lowest Common Ancestor of a Binary Search Tree236. Lowest Common Ancestor of a Binar

2016-09-29 15:07:31 267

转载 [LeetCode]217. Contains Duplicate&219. Contains Duplicate II&220. Contains Duplicate III

217. Contains Duplicate219. Contains Duplicate II220. Contains Duplicate III

2016-09-28 23:30:19 312

转载 [LeetCode]83. Remove Duplicates from Sorted List

EasyGiven a sorted linked list, delete all duplicates such that each element appear only once.For example, Given 1->1->2, return 1->2. Given 1->1->2->3->3, return 1->2->3.2ms: public ListNode deleteD

2016-09-28 22:41:39 210

转载 [LeetCode]401. Binary Watch

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

2016-09-28 21:58:36 256

转载 [LeetCode]169. Majority Element&229. Majority Element II

169. Majority Element229. Majority Element II

2016-09-28 19:57:21 239

转载 [LeetCode]387. First Unique Character in a String

EasyGiven a string, find the first non-repeating character in it and return it’s index. If it doesn’t exist, return -1.Examples:s = “leetcode” return 0.s = “loveleetcode”, return 2. Note: You may as

2016-09-28 16:40:30 221

转载 [LeetCode]404. Sum of Left Leaves

EasyFind the sum of all left leaves in a given binary tree.Example:3/ \ 9 20 / \ 15 7There are two left leaves in the binary tree, with values 9 and 15 respectively. Return 24.9ms: pub

2016-09-28 15:21:25 245

转载 [LeetCode]101. Symmetric Tree

EasyGiven a binary tree, check whether it is a mirror of itself (ie, symmetric around its center).For example, this binary tree [1,2,2,3,4,4,3] is symmetric:1/ \ 2 2 / \ / \ 3 4 4 3 But the

2016-09-17 10:51:37 291

转载 [LeetCode]66. Plus One

EasyGiven a non-negative number represented as an array of digits, plus one to the number.The digits are stored such that the most significant digit is at the head of the list.1ms:public int[] plusOne(

2016-09-17 10:50:32 207

转载 [LeetCode]319. Bulb Switcher

MediumThere are n bulbs that are initially off. You first turn on all the bulbs. Then, you turn off every second bulb. On the third round, you toggle every third bulb (turning on if it’s off or turning

2016-09-17 10:48:31 367

转载 [LeetCode]268. Missing Number

MediumGiven 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 run i

2016-09-17 10:46:23 259

转载 [LeetCode]155. Min Stack

EasyDesign a stack that supports push, pop, top, and retrieving the minimum element in constant time.push(x) – Push element x onto stack. pop() – Removes the element on top of the stack. top() – Get

2016-09-17 10:40:47 180

转载 [LeetCode]278. First Bad Version

EasyYou are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fails the quality check. Since each version is developed based on

2016-09-17 10:38:29 243