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原创 Leetcode 3: 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 "abc", with the length of 3. Example 2:Inpu...
2020-03-01 14:55:10
134
原创 Leetcode 53: Maximum Subarray
Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum.Example:Input: [-2,1,-3,4,-1,2,1,-5,4],Output: 6Explanation:...
2020-03-09 12:31:12
128
原创 Leetcode 5: Longest Palindromic Substring
Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000.Example 1:Input: "babad"Output: "bab"Note: "aba" is also a valid answer.Example...
2020-03-02 07:10:47
163
原创 Leetcode 207: Course Schedule
There are a total of n courses you have to take, labeled from 0 to n-1.Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which is expressed as a pair:...
2020-03-02 06:48:48
127
原创 Leetcode 694: Number of Distinct Islands
Given a non-empty 2D array grid of 0’s and 1’s, an island is a group of 1’s (representing land) connected 4-directionally (horizontal or vertical.) You may assume all four edges of the grid are surrou...
2020-03-01 13:55:45
221
原创 Leetcode 200 Number of Islands
Given a 2d grid map of '1’s (land) and '0’s (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume...
2020-03-01 13:41:42
138
原创 Leetcode 323: Number of Connected Components in an Undirected Graph
Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to find the number of connected components in an undirected graph.Example 1:Inpu...
2020-03-01 13:29:45
247
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