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RSS订阅原创 [leetcode] 152. Maximum Product Subarray
Maximum Product SubarrayGiven an integer array nums, find the contiguous subarray within an array (containing at least one number) which has the largest product.Example 1:Input: [2,3,-2,4]Output:...
2019-08-26 15:44:09
153
原创 [leetcode] 149. Max Points on a Line
Max Points on a LineGiven n points on a 2D plane, find the maximum number of points that lie on the same straight line.Example 1:Input: [[1,1],[2,2],[3,3]]Output: 3Explanation:^|| o| ...
2019-08-24 21:36:53
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原创 [leetcode] 139. Word Break
Word BreakGiven a non-empty string s and a dictionary wordDict containing a list of non-empty words, determine if s can be segmented into a space-separated sequence of one or more dictionary words.N...
2019-08-17 11:25:40
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原创 [leetcode] 135. Candy
CandyThere are N children standing in a line. Each child is assigned a rating value.You are giving candies to these children subjected to the following requirements:Each child must have at least on...
2019-08-16 21:40:49
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原创 [leetcode] 132.Palindrome Partitioning II
Palindrome Partitioning IIGiven a string s, partition s such that every substring of the partition is a palindrome.Return the minimum cuts needed for a palindrome partitioning of s.Example:Input:...
2019-08-16 19:22:14
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原创 [leetcode] 131. Palindrome Partitioning
Palindrome PartitioningGiven a string s, partition s such that every substring of the partition is a palindrome.Return all possible palindrome partitioning of s.Example:Input: “aab”Output:[[“a...
2019-08-16 16:48:42
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原创 [leetcode] 130. Surrounded Regions
Surrounded RegionsGiven a 2D board containing ‘X’ and ‘O’ (the letter O), capture all regions surrounded by ‘X’.A region is captured by flipping all 'O’s into 'X’s in that surrounded region.Example...
2019-08-16 15:30:42
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原创 [leetcode] 127. Word Ladder
Word LadderGiven two words (beginWord and endWord), and a dictionary’s word list, find the length of shortest transformation sequence from beginWord to endWord, such that:Only one letter can be chan...
2019-08-14 22:19:40
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原创 [leetcode] 128. Longest Consecutive Sequence
Longest Consecutive SequenceGiven an unsorted array of integers, find the length of the longest consecutive elements sequence.Your algorithm should run in O(n) complexity.Example:Input: [100, 4...
2019-08-12 21:56:05
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原创 [leetcode] 115. Distinct Subsequences
Distinct SubsequencesGiven a string S and a string T, count the number of distinct subsequences of S which equals T.A subsequence of a string is a new string which is formed from the original string...
2019-08-10 10:09:09
105
原创 [leetcode] 97. Interleaving String
Interleaving StringGiven s1, s2, s3, find whether s3 is formed by the interleaving of s1 and s2.Example 1:Input: s1 = “aabcc”, s2 = “dbbca”, s3 = “aadbbcbcac”Output: trueExample 2:Input: s1 =...
2019-08-01 20:02:54
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原创 [leetcode] 87. Scramble String
Scramble StringGiven a string s1, we may represent it as a binary tree by partitioning it to two non-empty substrings recursively.Below is one possible representation of s1 = “great”:Given two str...
2019-07-31 19:03:07
104
原创 [leetcode] 221. Maximal Square && 85. Maximal Rectangle
Maximal SquareGiven a 2D binary matrix filled with 0’s and 1’s, find the largest square containing only 1’s and return its area.Example:Input:1 0 1 0 01 0 1 1 11 1 1 1 11 0 0 1 0Output: 4解法...
2019-07-28 13:18:36
214
原创 [LeetCode] 78. Subsets && 90. Subsets II
SubsetsGiven a set of distinct integers, nums, return all possible subsets (the power set).Note: The solution set must not contain duplicate subsets.Example:Input: nums = [1,2,3]Output:[[3],[...
2019-07-26 20:17:42
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原创 [LeetCode] 93. Restore IP Addresses
Restore IP AddressesGiven a string containing only digits, restore it by returning all possible valid IP address combinations.Example:Input: “25525511135”Output: [“255.255.11.135”, “255.255.111.3...
2019-07-25 20:28:53
81
原创 [LeetCode] 84. Largest Rectangle in Histogram
Largest Rectangle in HistogramGiven n non-negative integers representing the histogram’s bar height where the width of each bar is 1, find the area of largest rectangle in the histogram.Example:I...
2019-07-23 16:34:35
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原创 [leetcode] 76. Minimum Window Substring
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”Ou...
2019-07-21 15:09:25
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原创 [LeetCode] 72. Edit Distance
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 characterDel...
2019-07-21 11:46:51
85
原创 [LeetCode] 123. Best Time to Buy and Sell Stock III
Best Time to Buy and Sell Stock IIISay 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 at most two...
2019-04-06 15:59:46
130
原创 [LeetCode] 51. N-Queens
N-QueensThe n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other.Given an integer n, return all distinct solutions to the n-queens puzzle...
2019-04-02 16:15:46
147
原创 [LeetCode] 47. Permutations 2
Permutations 2Given a collection of numbers that might contain duplicates, return all possible unique permutations.Example:Input: [1,1,2]Output:[[1,1,2],[1,2,1],[2,1,1]]解析相比于Permutations，...
2019-04-02 15:02:52
143
原创 [LeetCode] 46. Permutations
PermutationsGiven a collection of distinct integers, return all possible permutations.Example:Input: [1,2,3]Output:[[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]]解析生成全排列。解法1：DFS用一个...
2019-04-01 16:39:43
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原创 [LeetCode] 45. Jump Game2
Jump Game2Given an array of non-negative integers, you are initially positioned at the first index of the array.Each element in the array represents your maximum jump length at that position.Your g...
2019-04-01 15:36:45
141
原创 [LeetCode] 55. Jump Game
Jump GameGiven an array of non-negative integers, you are initially positioned at the first index of the array.Each element in the array represents your maximum jump length at that position.Determi...
2019-04-01 15:17:54
145
原创 [LeetCode] 43. Multiply Strings
Multiply StringsGiven two non-negative integers num1 and num2 represented as strings, return the product of num1 and num2, also represented as a string.Example 1:Input: num1 = “2”, num2 = “3”Outp...
2019-03-31 23:07:12
109
原创 [LeetCode] 42. Trapping Rain Water
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.Example:Input: [0,1,0,2,1,...
2019-03-31 21:25:33
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原创 [LeetCode] 41. First Missing Positive
First Missing PositiveGiven an unsorted integer array, find the smallest missing positive integer.Example 1:Input: [1,2,0]Output: 3Example 2:Input: [3,4,-1,1]Output: 2Example 3:Input: [7...
2019-03-30 17:58:29
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原创 [LeetCode] 37. Sudoku Solver
Sudoku SolverWrite a program to solve a Sudoku puzzle by filling the empty cells.A sudoku solution must satisfy all of the following rules:Each of the digits 1-9 must occur exactly once in each ro...
2019-03-29 14:14:21
150
原创 [LeetCode] 34. Find First and Last Position of Element in Sorted Array Medium
Find First and Last Position of Element in Sorted ArrayGiven an array of integers nums sorted in ascending order, find the starting and ending position of a given target value.Your algorithm’s runti...
2019-03-29 13:02:36
164
原创 [LeetCode] 33. Search in Rotated Sorted Array
Search in Rotated Sorted ArraySuppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand.(i.e., [0,1,2,4,5,6,7] might become [4,5,6,7,0,1,2]).You are given a targ...
2019-03-29 10:00:58
129
原创 [LeetCode] 32. Longest Valid Parentheses
Longest Valid ParenthesesGiven a string containing just the characters ‘(’ and ‘)’, find the length of the longest valid (well-formed) parentheses substring.Example 1:Input: “(()”Output: 2Explan...
2019-03-28 21:24:10
146
原创 [LeetCode] 29. Divide Two Integers
Divide Two IntegersGiven two integers dividend and divisor, divide two integers without using multiplication, division and mod operator.Return the quotient after dividing dividend by divisor.The in...
2019-03-28 19:03:12
114
原创 [LeetCode] 22. Generate Parentheses
Generate ParenthesesGiven n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.For example, given n = 3, a solution set is:[“((()))”,“(()())”,“(())()...
2019-03-27 17:16:21
106
原创 [LeetCode] 17. Letter Combinations of a Phone Number
Letter Combinations of a Phone NumberGiven a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent.A mapping of digit to letters (just ...
2019-03-27 15:44:43
218
原创 [LeetCode] 18. 4Sum
4SumGiven an array nums of n integers and an integer target, are there elements a, b, c, and d in nums such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum o...
2019-03-27 10:28:36
131
原创 [LeetCode] 16. 3Sum Closest
3Sum ClosestGiven an array nums of n integers and an integer target, find three integers in nums such that the sum is closest to target. Return the sum of the three integers. You may assume that each...
2019-03-27 09:46:33
120
原创 [LeetCode] 15. 3Sum
3SumGiven an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.Note:The solution set must not c...
2019-03-26 20:55:00
107
原创 [LeetCode] 10. Regular Expression Matching
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 more o...
2019-03-25 21:51:33
122
原创 [LeetCode] 4. Median of Two Sorted Arrays
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))....
2019-03-24 19:51:44
143
原创 [LeetCode] 3. Longest Substring Without Repeating Characters
Longest Substring Without Repeating CharactersGiven a string, find the length of the longest substring without repeating characters.Example 1:Input: “abcabcbb”Output: 3Explanation: The answer is...
2019-03-24 15:43:04
133
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