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RSS订阅原创 LeetCode 864. Shortest Path to Get All Keys
864. Shortest Path to Get All KeysWe are given a 2-dimensional grid. “.” is an empty cell, “#” is a wall, “@” is the starting point, (“a”, “b”, …) are keys, and (“A”, “B”, …) are locks.We start at t...
2019-02-24 16:45:30
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原创 LeetCode 502.IPO
502.IPOSuppose LeetCode will start its IPO soon. In order to sell a good price of its shares to Venture Capital, LeetCode would like to work on some projects to increase its capital before the IPO. S...
2019-02-23 17:36:55
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原创 网易笔试题-堆棋子
题目描述小易将n个棋子摆放在一张无限大的棋盘上。第i个棋子放在第x[i]行y[i]列。同一个格子允许放置多个棋子。每一次操作小易可以把一个棋子拿起并将其移动到原格子的上、下、左、右的任意一个格子中。小易想知道要让棋盘上出现有一个格子中至少有i(1 ≤ i ≤ n)个棋子所需要的最少操作次数.输入描述:输入包括三行,第一行一个整数n(1 ≤ n ≤ 50),表示棋子的个数第二行为n个棋子的横...
2019-02-21 18:44:24
437
原创 LeetCode 76. Minimum Window Substring
76. Minimum Window SubstringGiven a string S and a string T, find the minimum window in S which will contain all the characters in T in complexity O(n).Example:Input: S = “ADOBECODEBANC”, T = “ABC”...
2019-02-17 19:29:18
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原创 LeetCode 72. Edit Distance
72. Edit DistanceGiven two words word1 and word2, find the minimum number of operations required to convert word1 to word2.You have the following 3 operations permitted on a word:Insert a character...
2019-02-17 16:27:22
198
原创 LeetCode 68. Text Justification
68. Text JustificationGiven an array of words and a width maxWidth, format the text such that each line has exactly maxWidth characters and is fully (left and right) justified.You should pack your w...
2019-02-17 15:35:41
174
原创 LeetCode 899. Orderly Queue
899. Orderly QueueA string S of lowercase letters is given. Then, we may make any number of moves.In each move, we choose one of the first K letters (starting from the left), remove it, and place i...
2019-02-16 16:45:09
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原创 LeetCode 44. Wildcard Matching
44. Wildcard MatchingGiven an input string (s) and a pattern §, implement wildcard pattern matching with support for ‘?’ and ‘*’.'?' Matches any single character.'*' Matches any sequence of charact...
2019-02-16 15:17:11
177
原创 LeetCode 30. Substring with Concatenation of All Words
30. Substring with Concatenation of All WordsYou are given a string, s, and a list of words, words, that are all of the same length. Find all starting indices of substring(s) in s that is a concatena...
2019-02-14 19:34:56
245
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原创 LeetCode 10. Regular Expression Matching
10. Regular Expression MatchingGiven an input string (s) and a pattern §, implement regular expression matching with support for ‘.’ and ‘*’.‘.’ Matches any single character.‘*’ Matches zero or mor...
2019-02-14 15:21:57
192
原创 Leetcode 4. Median of Two Sorted Arrays
4. Median of Two Sorted ArraysThere 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 should be O(log (m+n)...
2019-02-13 20:07:17
177
原创 LeetCode 218. The Skyline Problem
A city’s skyline is the outer contour of the silhouette formed by all the buildings in that city when viewed from a distance. Now suppose you are given the locations and height of all the buildings as...
2019-02-13 17:19:01
207
原创 LeetCode 316. Remove Duplicate Letters
（自己开发的博客，欢迎访问）https://www.weiboke.online316. Remove Duplicate LettersGiven a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. Yo...
2019-02-11 17:08:00
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原创 leetcode 895. Maximum Frequency Stack
895. Maximum Frequency StackImplement FreqStack, a class which simulates the operation of a stack-like data structure.FreqStack has two functions:push(int x), which pushes an integer x onto the sta...
2019-02-11 16:00:01
286
原创 leetcode 85. Maximal Rectangle
Given a 2D binary matrix filled with 0’s and 1’s, find the largest rectangle containing only 1’s and return its area.Example:Input:[[“1”,“0”,“1”,“0”,“0”],[“1”,“0”,“1”,“1”,“1”],[“1”,“1”,“1”,“1”,“...
2019-02-03 22:10:26
162
原创 LeetCode 42. Trapping Rain Water
42. Trapping Rain WaterGiven n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.The above elevation map ...
2019-02-03 20:04:41
250
原创 leetcode 880. Decoded String at Index
880. Decoded String at IndexAn encoded string S is given. To find and write the decoded string to a tape, the encoded string is read one character at a time and the following steps are taken:If the...
2019-02-03 17:03:18
215
原创 907. Sum of Subarray Minimums
欢迎访问我的博客网站 https://www.weiboke.online/posts/page907. Sum of Subarray MinimumsGiven an array of integers A, find the sum of min(B), where B ranges over every (contiguous) subarray of A.Since the ans...
2019-02-03 16:14:24
143
原创 leetcode 385. Mini Parser
385. Mini ParserGiven a nested list of integers represented as a string, implement a parser to deserialize it.Each element is either an integer, or a list – whose elements may also be integers or ot...
2019-02-02 14:11:18
185
原创 Leetcode 173. Binary Search Tree Iterator
173. Binary Search Tree IteratorImplement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST.Calling next() will return the next smallest numb...
2019-02-02 09:54:23
184
原创 leetcode 155.Min Stack 单调栈的简单应用
155. Min StackDesign 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....
2019-02-01 10:23:54
284
原创 Golang HTTP服务器源码简析
自己开发的博客网站，欢迎访问www.weiboke.online简单用例mux := http.NewServeMux() mux.HandleFunc("/", func(writer http.ResponseWriter, request *http.Request) { writer.Write([]byte("ok&
2019-01-21 10:21:06
443
原创 MYSQL 判断某表中某数值是否存在
> select isnull((select × from tableName where conditions))以前常喜欢使用COUNT(*)计算条数，其实这样速度会非常的慢，因为会聚集索引进行扫描和计算，read特别多，特别是 cpu 资源占用极大，晚上查了下资料可以使用isnull的方法，使性能最优。...
2018-11-21 11:10:48
5537
原创 [WXM] LeetCode 424. Longest Repeating Character Replacement C++
424. Longest Repeating Character ReplacementGiven a string that consists of only uppercase English letters, you can replace any letter in the string with another letter at most k times. Find the len...
2018-09-06 17:11:08
297
原创 [WXM] LeetCode 395. Longest Substring with At Least K Repeating Characters C++
395. Longest Substring with At Least K Repeating CharactersFind the length of the longest substring T of a given string (consists of lowercase letters only) such that every character in T appears no...
2018-09-06 16:15:14
378
原创 [WXM] LeetCode 334. Increasing Triplet Subsequence C++
334. Increasing Triplet SubsequenceGiven 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 exist...
2018-09-05 22:51:59
218
原创 [WXM] LeetCode Minimum Moves to Equal Array Elements II C++
Minimum Moves to Equal Array Elements IIGiven a non-empty integer array, find the minimum number of moves required to make all array elements equal, where a move is incrementing a selected element b...
2018-09-04 23:08:08
176
原创 [WXM] LeetCode 397. Integer Replacement C++
397. Integer ReplacementGiven a positive integer n and you can do operations as follow:1.If n is even, replace n with n/2. 2.If n is odd, you can replace n with either n + 1 or n - 1. What is th...
2018-09-04 17:13:57
267
原创 [WXM] LeetCode 201. Bitwise AND of Numbers Range C++
201. Bitwise AND of Numbers RangeGiven a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive.Example 1:Input: [5,7]Output: 4...
2018-09-04 16:02:08
239
原创 [WXM] LeetCode 318. Maximum Product of Word Lengths C++
318. Maximum Product of Word LengthsGiven 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 ...
2018-09-04 15:07:10
300
原创 [WXM] LeetCode 421. Maximum XOR of Two Numbers in an Array C++
421. Maximum XOR of Two Numbers in an ArrayGiven a non-empty array of numbers, a0, a1, a2, … , an-1, where 0 ≤ ai < 231.Find the maximum result of ai XOR aj, where 0 ≤ i, j < n.Could you d...
2018-09-03 09:53:56
219
原创 [WXM] LeetCode 260. Single Number III C++
260. Single Number IIIGiven an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two elements that appear only once.Ex...
2018-09-03 08:11:41
245
原创 [WXM] LeetCode 898. Bitwise ORs of Subarrays C++
898. Bitwise ORs of SubarraysWe have an array A of non-negative integers.For every (contiguous) subarray B = [A[i], A[i+1], …, A[j]] (with i &amp;lt;= j), we take the bitwise OR of all the elements in...
2018-09-02 22:19:31
696
原创 [WXM] LeetCode 137. Single Number II C++
137. Single Number IIGiven a non-empty array of integers, every element appears three times except for one, which appears exactly once. Find that single one.Note:Your algorithm should have a lin...
2018-09-02 21:37:21
246
原创 [WXM] LeetCode 99. Recover Binary Search Tree C++
99. Recover Binary Search TreeTwo elements of a binary search tree (BST) are swapped by mistake.Recover the tree without changing its structure.Example 1:Input: [1,3,null,null,2] 1 / ...
2018-09-02 11:26:41
208
原创 [WXM] LeetCode 834. Sum of Distances in Tree C++
834. Sum of Distances in TreeAn undirected, connected tree with N nodes labelled 0…N-1 and N-1 edges are given.The ith edge connects nodes edges[i][0] and edges[i][1] together.Return a list ans,...
2018-09-01 22:21:05
459
原创 [WXM] LeetCode 894. All Possible Full Binary Trees C++
894. All Possible Full Binary TreesA full binary tree is a binary tree where each node has exactly 0 or 2 children.Return a list of all possible full binary trees with N nodes. Each element of th...
2018-09-01 17:32:22
410
原创 [WXM] LeetCode 322. Coin Change C++
322. Coin ChangeYou 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 tha...
2018-08-30 10:57:52
371
原创 [WXM] LeetCode 523. Continuous Subarray Sum C++
523. Continuous Subarray SumGiven a list of non-negative numbers and a target integer k, write a function to check if the array has a continuous subarray of size at least 2 that sums up to the multi...
2018-08-29 16:55:30
246
原创 [WXM] LeetCode 673. Number of Longest Increasing Subsequence C++
673. Number of Longest Increasing SubsequenceGiven an unsorted array of integers, find the number of longest increasing subsequence.Example 1:Input: [1,3,5,4,7]Output: 2Explanation: The two ...
2018-08-29 16:12:24
256
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