王钲超

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全部文章（共13篇）

SQL91 获得积分最多的人(三)

用case when讲grade改成带正负的 2. groupby id + sum() 3. dense_rank = 1select id, name, grade_sum from (SELECT t2.user_id as id, t3.name as name, t2.sum2 as g...

2021-08-02

0 415

题解 | #子数组最大乘积# PYTHON3 动态规划O（N）

# # # @param arr double浮点型一维数组 # @return double浮点型 # class Solution: def maxProduct(self , arr ): # write code here global_max =...

2021-07-30

0 308

题解 | #岛屿数量#python3 普通的递归dfs

#坑就是grid里的元素时字符串形式.. class Solution: def solve(self , grid ): # write code here record = [[0 for e in sublist] for sublist in grid...

2021-07-28

0 305

题解 | #股票(无限次交易)#

每遍历到一个价格：如果可以赚，就卖掉，并存入账户；如果不赚，就假装前一次没有买入买入 class Solution: def maxProfit(self , prices ): # write code here c = 0 last...

2021-07-27

0 365

题解 | #最小的K个数#python三种方法实现sort、heap、partition

# -*- coding:utf-8 -*- import heapq #利用heapq实现一个大根堆 def heapify(x): for i in range(len(x)): x[i] = -x[i] heapq.heapify(x) def heappus...

2021-07-26

0 321

题解 | #子数组的最大累加和问题#

class Solution: def maxsumofSubarray(self , arr ): # write code here global_max = 0 max_cache = 0 for i in arr: ...

2021-07-25

0 287

查找描述信息中包括robot的电影对应的分类名称以及电影数目

select category.name as "分类名称category.name",count(*) as "电影数目count(film.film_id)"from film left join film_category on film.film_id = film_category.f...

2020-08-18

0 502

给出每个员工每年薪水涨幅超过5000的员工

select s1.emp_no, s1.from_date, (s1.salary - s2.salary) as salary_growthfrom salaries s1, salaries s2where s1.emp_no = s2.emp_no and s1.from_date = s2...

2020-08-18

0 505

获取员工其当前的薪水比其manager当前薪水还高的相关信息

select t2.emp_no, t2.manager_no, t2.emp_salary, salaries.salary as manager_salary from (select t1.emp_no as emp_no, dept_manager.emp_no as manager_no...

2020-08-17

0 589

统计出当前各个title类型对应的员工当前薪水对应的平均工资

select titles.title, avg(salaries.salary) as avgfrom salaries, titleswhere titles.to_date='9999-01-01' and salaries.to_date='9999-01-01'and salaries....

2020-08-12

0 537