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原创 [leetcode] 152. Maximum Product Subarray

Maximum Product Subarray Given 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 15:44:09 206

原创 [leetcode] 149. Max Points on a Line

Max Points on a Line Given 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: 3 Explanation: ^ | | o | ...

2019-08-24 21:36:53 196

原创 [leetcode] 139. Word Break

Word Break Given 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 11:25:40 211

原创 [leetcode] 135. Candy

Candy There 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 21:40:49 154

原创 [leetcode] 132.Palindrome Partitioning II

Palindrome Partitioning II Given 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 19:22:14 192

原创 [leetcode] 131. Palindrome Partitioning

Palindrome Partitioning Given 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 16:48:42 162

原创 [leetcode] 130. Surrounded Regions

Surrounded Regions Given 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 15:30:42 116

原创 [leetcode] 127. Word Ladder

Word Ladder Given 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 22:19:40 116

原创 [leetcode] 128. Longest Consecutive Sequence

Longest Consecutive Sequence Given an unsorted array of integers, find the lengt h of the longest consecutive elements sequence. Your algorithm should run in O(n) complexity. Example: Input: [100, 4...

2019-08-12 21:56:05 124

原创 [leetcode] 115. Distinct Subsequences

Distinct Subsequences Given 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 10:09:09 145

原创 [leetcode] 97. Interleaving String

Interleaving String Given 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: true Example 2: Input: s1 =...

2019-08-01 20:02:54 215

原创 [leetcode] 87. Scramble String

Scramble String Given 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 19:03:07 130

原创 [leetcode] 221. Maximal Square && 85. Maximal Rectangle

Maximal Square Given 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 0 1 0 1 1 1 1 1 1 1 1 1 0 0 1 0 Output: 4 解法...

2019-07-28 13:18:36 279

原创 [LeetCode] 78. Subsets && 90. Subsets II

Subsets Given 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 20:17:42 147

原创 [LeetCode] 93. Restore IP Addresses

Restore IP Addresses Given 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 20:28:53 115

原创 [LeetCode] 84. Largest Rectangle in Histogram

Largest Rectangle in Histogram Given 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 16:34:35 125

原创 [leetcode] 76. Minimum Window Substring

Minimum Window Substring Given 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 15:09:25 134

原创 [LeetCode] 72. Edit Distance

Edit Distance Given 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 Del...

2019-07-21 11:46:51 119

原创 [LeetCode] 123. Best Time to Buy and Sell Stock III

Best Time to Buy and Sell Stock III 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 at most two...

2019-04-06 15:59:46 155

原创 [LeetCode] 51. N-Queens

N-Queens The 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 16:15:46 185

原创 [LeetCode] 47. Permutations 2

Permutations 2 Given 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 15:02:52 187

原创 [LeetCode] 46. Permutations

Permutations Given 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 16:39:43 152

原创 [LeetCode] 45. Jump Game2

Jump Game2 Given 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 15:36:45 202

原创 [LeetCode] 55. Jump Game

Jump Game Given 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 15:17:54 180

原创 [LeetCode] 43. Multiply Strings

Multiply Strings Given 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 23:07:12 141

原创 [LeetCode] 42. Trapping Rain Water

Trapping Rain Water Given 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 21:25:33 191

原创 [LeetCode] 41. First Missing Positive

First Missing Positive Given an unsorted integer array, find the smallest missing positive integer. Example 1: Input: [1,2,0] Output: 3 Example 2: Input: [3,4,-1,1] Output: 2 Example 3: Input: [7...

2019-03-30 17:58:29 149

原创 [LeetCode] 37. Sudoku Solver

Sudoku Solver Write 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 14:14:21 186

原创 [LeetCode] 34. Find First and Last Position of Element in Sorted Array Medium

Find First and Last Position of Element in Sorted Array Given 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 13:02:36 271

原创 [LeetCode] 33. Search in Rotated Sorted Array

Search in Rotated Sorted Array Suppose 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 10:00:58 165

原创 [LeetCode] 32. Longest Valid Parentheses

Longest Valid Parentheses Given a string containing just the characters ‘(’ and ‘)’, find the length of the longest valid (well-formed) parentheses substring. Example 1: Input: “(()” Output: 2 Explan...

2019-03-28 21:24:10 205

原创 [LeetCode] 29. Divide Two Integers

Divide Two Integers Given 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 19:03:12 145

原创 [LeetCode] 22. Generate Parentheses

Generate Parentheses Given 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 17:16:21 140

原创 [LeetCode] 17. Letter Combinations of a Phone Number

Letter Combinations of a Phone Number Given 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 15:44:43 257

原创 [LeetCode] 18. 4Sum

4Sum Given 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 10:28:36 168

原创 [LeetCode] 16. 3Sum Closest

3Sum Closest Given 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 09:46:33 159

原创 [LeetCode] 15. 3Sum

3Sum Given 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 20:55:00 138

原创 [LeetCode] 10. Regular Expression Matching

Regular Expression Matching Given 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 21:51:33 155

原创 [LeetCode] 4. Median of Two Sorted Arrays

Median of Two Sorted Arrays There 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 19:51:44 176

原创 [LeetCode] 3. Longest Substring Without Repeating Characters

Longest Substring Without Repeating Characters Given a string, find the length of the longest substring without repeating characters. Example 1: Input: “abcabcbb” Output: 3 Explanation: The answer is...

2019-03-24 15:43:04 169

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