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RSS订阅原创 Hexo使用next主题也可以用latex啦
Hexo使用了next主题，不能使用latex公式，这可麻烦了。更换Hexo的默认的hexo-renderer-marked渲染引擎，改为hexo-renderer-kramed。在终端输入命令如下：sudo npm uninstall hexo-renderer-markedsudo npm install hexo-renderer-kramed --save开启NexT主题的M...
2018-09-16 15:55:45
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原创 367. Valid Perfect Square
Given a positive integer num, write a function which returns True if num is a perfect square else False.Note: Do not use any built-in library function such as sqrt.Example 1:Input: 16...
2018-09-16 15:31:07
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原创 354. Russian Doll Envelopes
You have a number of envelopes with widths and heights given as a pair of integers (w, h). One envelope can fit into another if and only if both the width and height of one envelope is greater tha...
2018-09-16 15:17:30
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原创 341. Flatten Nested List Iterator
Given a nested list of integers, implement an iterator to flatten it. Each element is either an integer, or a list – whose elements may also be integers or other lists.Example 1:Input: [[...
2018-09-16 14:31:29
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原创 343. Integer Break
Given a positive integer nnn, 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.Example 1:Input: 2Outp...
2018-09-16 14:09:30
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原创 347. Top K Frequent Elements
Given a non-empty array of integers, return the k most frequent elements.Example 1:Input: nums = [1,1,1,2,2,3], k = 2Output: [1,2]Example 2:Input: nums = [1], k = 1Output: [1]Note:...
2018-09-16 14:08:02
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原创 350. Intersection of Two Arrays II
Given two arrays, write a function to compute their intersection.Example 1:Input: nums1 = [1,2,2,1], nums2 = [2,2]Output: [2,2]Example 2:Input: nums1 = [4,9,5], nums2 = [9,4,9,8,4]Outp...
2018-09-16 14:06:20
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原创 349. Intersection of Two Arrays
Given two arrays, write a function to compute their intersection.Example 1:Input: nums1 = [1,2,2,1], nums2 = [2,2]Output: [2]Example 2:Input: nums1 = [4,9,5], nums2 = [9,4,9,8,4]Output...
2018-09-16 14:04:53
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原创 345. Reverse Vowels of a String
Write a function that takes a string as input and reverse only the vowels of a string.Example 1:Input: "hello"Output: "holle"Example 2:Input: "leetcode"Output: "leotcede"Note: T...
2018-09-16 14:03:20
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原创 338. Counting Bits
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 1:Input: 2...
2018-09-16 13:59:49
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原创 337. House Robber III
The thief has found himself a new place for his thievery again. There is only one entrance to this area, called the “root.” Besides the root, each house has one and only one parent house. After a tour...
2018-09-10 15:55:28
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原创 335. Self Crossing
You are given an array x of n positive numbers. You start at point (0,0) and moves x[0] metres to the north, then x[1] metres to the west, x[2] metres to the south, x[3] metres to the east and so on. ...
2018-09-10 11:36:48
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原创 334. Increasing Triplet Subsequence
Given an unsorted array return whether an increasing subsequence of length 3 exists or not in the array.Formally the function should: Return true if there exists i, j, k such that arr[i] &...
2018-09-10 00:58:03
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原创 344. Reverse String
Write a function that takes a string as input and returns the string reversed.Example 1:Input: "hello"Output: "olleh"Example 2:Input: "A man, a plan, a canal: Panama"Output: "amanaP :lan...
2018-09-09 10:29:24
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原创 332. Reconstruct Itinerary
Given a list of airline tickets represented by pairs of departure and arrival airports [from, to], reconstruct the itinerary in order. All of the tickets belong to a man who departs from JFK. Thus, ...
2018-09-09 10:28:02
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原创 331. Verify Preorder Serialization of a Binary Tree
One way to serialize a binary tree is to use pre-order traversal. When we encounter a non-null node, we record the node\’s value. If it is a null node, we record using a sentinel value such as #. ...
2018-09-09 10:25:01
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原创 329. Longest Increasing Path in a Matrix
Given an integer matrix, find the length of the longest increasing path.From each cell, you can either move to four directions: left, right, up or down. You may NOT move diagonally or move outside o...
2018-09-09 10:22:53
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原创 328. Odd Even Linked List
Given a singly linked list, group all odd nodes together followed by the even nodes. Please note here we are talking about the node number and not the value in the nodes.You should try to do it in p...
2018-09-06 14:14:32
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原创 327. Count of Range Sum
Given an integer array nums, return the number of range sums that lie in [lower, upper] inclusive. Range sum S(i, j) is defined as the sum of the elements in nums between indices i and j (i ≤ j), inc...
2018-09-06 13:32:58
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原创 位运算小结及位运算题目小练
按位与运算 &按位与运算符”&”是双目运算符。其功能是参与运算的两数各对应的二进位相与。只有对应的两个二进位均为1时，结果位才为1，否则为0。参与运算的数以补码方式出现。 运算规则：0 & 0 = 00 & 1 = 01 & 0 = 01 & 1 = 1举例：9(00001001) &a
2018-09-05 21:09:51
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原创 326. Power of Three，342. Power of Four
Power of ThreeGiven an integer, write a function to determine if it is a power of three.Example 1:Input: 27Output: trueExample 2:Input: 0Output: falseExample 3:_Input: 9Output: ...
2018-09-05 14:45:10
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原创 324. Wiggle Sort II
Given an unsorted array nums, reorder it such thatnums[0] < nums[1] > nums[2] < nums[3]....Example 1:Input: nums = [1, 5, 1, 1, 6, 4]Output: One possible answer is [1, 4, 1, 5, 1
2018-09-04 23:50:53
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原创 376. Wiggle Subsequence
A sequence of numbers is called a wiggle sequence if the differences between successive numbers strictly alternate between positive and negative. The first difference (if one exists) may be either pos...
2018-09-01 23:16:23
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原创 322. Coin Change
You are given coins of different denominations and a total amount of money amount. Write a function to compute the fewest number of coins that you need to make up that amount. If that amount of money ...
2018-09-01 20:18:38
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原创 二叉树的前中后序遍历（非递归）的多种方式
前序迭代遍历前序遍历是先根后左再右，第一次接触到某个节点的时候就立即访问。栈刚开始的时候我们能接触到的只有根节点，然后我们将其值输出，然后访问它的左子女，因为我们对于一个节点只访问一次，所以我们访问完根节点之后就把根节点从栈中删除了，此时如果我们之前没有保存根节点的右子女，那么根节点右子女的信息变消失了，无法去访问，因为我们使用的是栈，后存入的先弹出，如果我们先存入左子女后存入右子...
2018-09-01 18:48:42
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原创 321. Create Maximum Number
Given two arrays of length m and n with digits 0-9 representing two numbers. Create the maximum number of length k <= m + n from digits of the two. The relative order of the digits from the same ar...
2018-09-01 15:06:45
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原创 330. Patching Array
Given a sorted positive integer array nums and an integer n, add/patch elements to the array such that any number in range [1, n] inclusive can be formed by the sum of some elements in the array. Retu...
2018-09-01 13:44:35
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原创 Hexo + GitHub Pages + NexT在win10上搭建个性化个人博客
刚刚搭好自己的个人博客，现在总结一下注册Github账号及创建仓库访问网址：https://github.com/ 注册好账号之后，点击下图中的Start Project 在Repository name中输入新建仓库的名称，如果我们只是想要在这个仓库里面放一些个人项目的话，这个名称随便取，但是我们现在是要搭建自己的个人博客，Repository name是有固定格...
2018-08-31 10:08:34
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原创 406. Queue Reconstruction by Height
Suppose you have a random list of people standing in a queue. Each person is described by a pair of integers (h, k), where h is the height of the person and k is the number of people in front of this ...
2018-08-26 12:43:43
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原创 319. Bulb Switcher
There 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 off ...
2018-08-26 12:28:02
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原创 860. Lemonade Change
At a lemonade stand, each lemonade costs $5. Customers are standing in a queue to buy from you, and order one at a time (in the order specified by bills).Each customer will only buy one lemonade a...
2018-08-26 12:00:52
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原创 455. Assign Cookies
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 coo...
2018-08-26 11:59:30
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原创 315. Count of Smaller Numbers After Self
You are given an integer array nums and you have to return a new counts array.The counts array has the property where counts[i] is the number of smaller elements to the right of nums[i].Example:I...
2018-08-22 22:25:42
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原创 313. Super Ugly Number
Write a program to find the nth super ugly number.Super ugly numbers are positive numbers whose all prime factors are in the given prime list primes of size k.Example:Input: n = 12, primes = [2,...
2018-08-22 22:18:22
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原创 310. Minimum Height Trees
For a undirected graph with tree characteristics, we can choose any node as the root. The result graph is then a rooted tree. Among all possible rooted trees, those with minimum height are called mini...
2018-08-19 18:42:06
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原创 309. Best Time to Buy and Sell Stock with Cooldown
Say you have an array for which the ith element is the price of a given stock on day i.Design an algorithm to find the maximum profit. You may complete as many transactions as you like (ie, buy one ...
2018-07-18 09:40:01
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原创 307. Range Sum Query - Mutable
Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive.The update(i, val) function modifies nums by updating the element at index i to val.Example:...
2018-07-17 16:13:43
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原创 Java.sql.Blob、byte[]、InputStream三种类型的相互转换
最近碰到了Java.sql.Blob、byte[]、InputStream三种类型的相互转换的问题，这里总结一下：一、InputStream ---> BlobHibernate提供了一个API：Hibernate.createBlob(new FileInputStream(" image/file path "));二、Blob ---> InputStream...
2018-07-17 13:41:44
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原创 306. Additive Number
Additive number is a string whose digits can form additive sequence.A valid additive sequence should contain at least three numbers. Except for the first two numbers, each subsequent number in the s...
2018-07-17 10:46:40
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原创 287. Find the Duplicate Number
Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist. Assume that there is only one duplicate number, fi...
2018-05-05 14:35:28
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骑士周游列国回溯递归解法
2017-04-05
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