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1. 从一个空集开始:[[]] 2.向所有已有子集添加第一个数 (1),从而创造新的子集:[[], [1]] 3.向所有已有子集添加第二个数 (5):[[], [1], [5], [1,5]] 4.向所有已有子集添加第三个数 (3):[[], [1], [5], [1,5], [3], [1,3], [5,3], [1,5,3]] 下面是这种子集模式...
比如这题Compare Version Numbers的一种解法：classSolution:# @param version1, a string# @param vers...
Reverse Nodes in k-Group 26. Remove Duplicates from Sorted Array 27. Remove Element 28. Implement strStr() 29. Divide Two Integers 30. Substring with Concatenation of All Words 33. Search in Rotated Sorted Array 34. Find First and Last Position of Element in Sorted Array 35. Search Insert...
Question : Given an unsorted array of integers, find the length of the longest consecutive elements sequence. For example, Given [100, 4, 200, 1, 3, 2], The longest consecutive elements sequence is [1, 2, 3, 4]. Return its length: 4. Your algorithm should run in O(n) complexity...
LeetCode Question Length of Last Word Description: Given a string s consists of upper/lower-case alphabets and empty space characters ’ ', return the length of last word in the string. Input: s = “Hello World” ...
https://leetcode-cn.com/problems/majority-element-ii/solution/cong-lun-wen-jiao-du-jiang-jie-mo-er-tou-piao-fa-b/ 1/2版本 想象着这样一个画面:会议大厅站满了投票代表,每个都有一个牌子上面写着自己所选的候选人的名字。然后选举意见不合的(所选的候选人不同)两个人,会打一架,并且会同时击倒对...
转载自:LeetCode Question Difficulty Distribution 1 Two Sum 2 5 array sort set Two Pointers 2 Add Two Numbers 3 4 linked list Two Pointers Math 3 Longest Substring Without Repeating Characters 3 2 string Two Pointers hashtable 4 Median of Two Sorted Arrays 5 3 array Binary Search 5 Longest ...
Write a SQL query to find all duplicate emails in a table named Person. For example, your query should return the following for the above table: 三、参考SQL 方法一:自己写的 selectEmailfromPersongroupbyEmailhavingcount(*)>1; 方法二:官方答案 ...
1. 2. 184. Department Highest Salary[M] 一、表信息 表一:Employee 表二:Department 二、题目信息 查询每个部门中,薪水最高的员工姓名及其薪水。 Write a SQL query to find employees who have the highest salary in each of the departments. For the above tables, your SQL query should return the ...