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RSS订阅原创 [leetcode]59. Spiral Matrix II
Given a positive integern, generate a square matrix filled with elements from 1 ton2in spiral order.Example:Input: 3Output:[ [ 1, 2, 3 ], [ 8, 9, 4 ], [ 7, 6, 5 ]]这一题我就用了一个很笨的方法。。em...
2019-04-20 16:41:07
128
原创 [leetcode] 34. Find First and Last Position of Element in Sorted Array
Given an array of integersnumssorted in ascending order, find the starting and ending position of a giventargetvalue.Your algorithm's runtime complexity must be in the order ofO(logn).If the...
2019-03-15 22:29:54
116
原创 [leetcode]38. Count and Say
38.Count and SayEasy6804923FavoriteShareThe count-and-say sequence is the sequence of integers with the first five terms as following:1. 12. 113. 214. 12115. 111221...
2019-03-07 19:40:19
124
原创 [leetcode]74. Search a 2D Matrix
Write an efficient algorithm that searches for a value in anmxnmatrix. This matrix has the following properties:Integers in each row are sorted from left to right. The first integer of each row...
2019-03-04 21:05:07
114
原创 [leetcode]29. Divide Two Integers
开学了。。最近一是懒了。。二是事情多。。。上了刷了一下leetcode。。29.Divide Two IntegersGiven two integersdividendanddivisor, divide two integers without using multiplication, division and mod operator.Return the quotie...
2018-09-17 22:30:18
138
原创 [leetcode]48. Rotate Image
48.Rotate ImageYou are given annxn2D matrix representing an image.Rotate the image by 90 degrees (clockwise).Note:You have to rotate the imagein-place, which means you have to modify the...
2018-08-13 15:00:17
113
原创 [leetcode]8. String to Integer (atoi)
8.String to Integer (atoi)Implementatoiwhichconverts a string to an integer.The function first discards as many whitespace characters as necessary until the first non-whitespace character i...
2018-07-25 21:57:28
252
原创 [leetcode]28. Implement strStr()
这几天在学如何搭虚拟机。。用Hadoop，还有重新补了一下java的知识就做了几题相对简单的题目，leetcode也是easy的题目28.Implement strStr()ImplementstrStr().Return the index of the first occurrence of needle in haystack, or-1if needle is...
2018-07-25 20:50:26
184
原创 [leetcode]17. Letter Combinations of a Phone Number
17.Letter Combinations of a Phone NumberGiven a string containing digits from2-9inclusive, return all possible letter combinations that the number could represent.A mapping of digit to letters ...
2018-07-20 14:46:37
250
原创 [leetcode]41. First Missing Positive
emm今天刷了好几题。。有一题是合并两个已经排序好的链表的，由于我已经写过了合并多个已排序好链表的算法。。这里就不贴了。。这次题目如下：41.First Missing PositiveGiven an unsorted integer array, find the smallest missingpositive integer.Example 1:Input: [1,2...
2018-07-19 21:52:28
108
原创 [leetcode]23. Merge k Sorted Lists
23.Merge k Sorted ListsMergeksorted linked lists and return it as one sorted list. Analyze and describe its complexity.Example:Input:[ 1->4->5, 1->3->4, 2->6]Output: ...
2018-07-19 15:48:44
131
原创 [leetcode]9. Palindrome Number
由于准备要开组会。。研究没啥进展，慌得一笔，开会前找了题简单的练练手。。Determine whether an integer is a palindrome. An integerisapalindrome when itreads the same backward as forward.Example 1:Input: 121Output: trueExamp...
2018-07-18 19:23:23
240
原创 [leetcode]2. Add Two Numbers
2.Add Two NumbersYou are given twonon-emptylinked lists representing two non-negative integers. The digits are stored inreverse orderand each of their nodes contain a single digit. Add the two ...
2018-07-17 10:11:04
227
原创 [leetcode]13. Roman to Integer
Roman numerals are represented by seven different symbols:I,V,X,L,C,DandM.Symbol ValueI 1V 5X 10L 50C 100D ...
2018-07-15 14:49:45
254
原创 [leetcode]12. Integer to Roman
12.Integer to RomanRoman numerals are represented by seven different symbols:I,V,X,L,C,DandM.Symbol ValueI 1V 5X 10L 50C ...
2018-07-15 11:26:46
111
原创 [leetcode]5. Longest Palindromic Substring
最近研究没什么进展。。无聊去刷刷leetcodeGiven a strings, find the longest palindromic substring ins. You may assume that the maximum length ofsis 1000.Example 1:Input: "babad"Output: "bab"Note: "aba" ...
2018-07-14 10:43:58
100
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